Can there even be some cracks you do not see? “We do this kind of inspection quite a bit. Owner/Engineer, Ruckus Composites. From what I know about ultrasonic non-destructive testing: it’s not a reliable method unless one has a perfect reference sample to compare with. Yesterday, a little boy hit my carbon framed road bike with his little bike while I was already standing. And that’s only with sophisticated (expensive) equipment. Shawn Small Obviously you end up with a bit of a protruding section , which can't be helped, and a few more grams, but your bike will be as strong as new. Another trick is to whack the tube with a quarter over and around the crack. There is no other visible structural damage. First, I … Comfort is a complicated topic because it’s not completely objective and it's largely rooted in what riders can perceive. If the sound is sharp and hollow it's OK. if it sounds dull and flat there might be a crack. A coin tap test is very effective. I have no idea what caused it -- I've never crashed, I haven't dropped the bike or knocked it over or dropped anything on it. Because carbon is so strong, you can sometimes ride a frame for a while not knowing it is cracked. When we say ‘carbon fibre’, we actually mean ‘carbon-fibre … Carbon fibre has a reputation of being a bit fragile, but that’s far from the truth, finds Margot McGovern.. Picture courtesy of Paint My Bike. Bummer! (m=25 lbs v=65 mph) you get a shocking nearly 4800 Joules of energy that has to go somewhere. Craig Calfee For comparison a baseball weighs about 145 grams and travels 54 m/s (120 mph) has a KE of 204 Joules. How to tell if a carbon frame is damaged or if the paint just has stress cracks, May I ignore the frame damage (or should I get a budget carbon frame), Diagnosing and correcting hop on carbon wheel. At this point, it’s hard to tell how extensive the damage is. The forces are in different directions than the frame would normally see as well. Founder, Calfee Design, Inc. From Ruckus Composites: You can quickly see where acetone stays wet in a crack as it evaporates. Gently push on the suspect area to feel if it’s softer than the surrounding area. There are also many types of dyes out there. I am buying a bike and saw what appears to be a line in it. Get 15% Off Membership →, New Year, Fitter You. While it is another useful tool for a proper carbon fiber facility, because of the thin materials used on all bike frames and components, you can most likely visually see any cracks developing if you use a good inspection flashlight and take your time. So, nobody got hurt, but his mum wanted me to check the frame, she was very sorry and apologized hundreds of times. New Year, Fitter You. Another aspect that makes it difficult on bikes is that you really need to soak out the area in question for a period at a specific temperature for proper penetration. Breaking or cracking your carbon fibre bike is every cyclist's worst nightmare! I've been fixing carbon fiber for over 10 years and have a deep understanding of advanced composite structure repair. Fluoro dye testing is primarily used for crack detection in metallic surfaces; I believe the train industry popularized it. We inspected it and found no damage beyond some chipped paint. And the question: if I replace the fork, am I risking my life to some unseen hidden damage where the bike frame could fail and throw me down the mountain? © 2021 Pocket Outdoor Media Inc. All Rights Reserved. Thanks for contributing an answer to Bicycles Stack Exchange! Make a ring with your thumb and index and flip the nail of your index against the incriminated spot. Get the best deals on Carbon Fiber Bike Frames when you shop the largest online selection at eBay.com. A 0.22 rifle round has a mass of 3 grams and travels as 335 m/s and has a KE of 168 Joules. Also, the competitor publishes that it’s the American Standard for Non Destructive Testing (as shown in attached screenshot). Link between bottom bracket and rear wheel widths. The process of repairing a carbon fiber bike frame that is cracked, damaged, or split is to lay new carbon fibers and epoxying them in the same direction as the original fibers. Carbon does not develop small cracks which could fail later like a steel or alloy frame might, by nature of it being a composite material. From Calfee Design: It sounds like the fork might have absorbed a lot of that energy when it broke. (SOUNDBITE OF COIN TAPPING) MONTENEGRO: That's cracked. Brady Kappius For a long time, I have been whining about the lousy skewers that Rocky Mounts are using on their roof racks. It just seems that way. Similar to the flouro-dye test but without the flashy colors. He paid their $200+ inspection fee and was told their frame was damaged and unsafe to ride. The wheels. Masking. Why is it so hard to build crewed rockets/spacecraft able to reach escape velocity? “Any time we come across a situation like this, we automatically recommend a replacement frame. Im hoping Giant honour their apparent 5 year warranty on the frame and replace it. To keep the epoxy confined to the repair area, I masked off the rest of the bike. Thanks guys for this tips, I will try it and hope the best! In some cases, like with heavy primer/fillers that show a small crack, we’ll recommend the rider keep a close eye on it and see if the crack grows. Heat effects it’s properties and leave it brittlecas mentioned. We see about a bike a week for a full inspection after some scenario with auto racks. Aluminum is actually a fairly soft metal, so in the ea… Have you ever heard of this method before, and do you think it could be effective for bike parts? Take a look at this carbon fibre bike repair . Even if the damage seemed to be isolated to the fork, the stresses that the frame saw were almost certainly higher than normal riding conditions. The more wraps and resin, the stronger. But we use a 10X loupe for that.” Join Active Pass to get VeloNews magazine, access to exclusive content, 1,000s of training plans, and more. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. It was true 20 years ago when aluminum frames were unrefined and still being built using traditional designs. "Pretty much anything can be repaired," he says, noting that the process of layering carbon, compressing the frame, and curing the new material is similar to the way new carbon bikes … ― Lennard. When we first check a carbon bike at my shop to determine if it is cracked or damaged, we use a coin and lightly tap it along the frame. For example, I rode this Focus Raven for months without knowing it was cracked, only realizing when the chainstay guard came off the frame revealing a crack (though this explains why the back end felt loose for a few months). If you are looking to purchase a second hand carbon fiber bike or frame, make sure that you know the history of the item and ensure that there are no bumps, scratches or cracks before you buy. Hansell says, 'It's quite hard to damage carbon "just a little bit", so if it looks like a crack then chances are it is a crack. “It can help to see the very fine cracks on damaged frames. The Romans worked this out when they were experimenting with concrete. Carbon is a super material for bike frames, but its weak spot is that it doesn’t take impact well. Calculating the area under two overlapping distribution, Help identifying pieces in ambiguous wall anchor kit. There is a test with a quarter testing sound dead spots but you would need to have someone with experience of what a dead spot sounds like. An x-ray technician recently told me that fluorescent penetrant inspection could work to inspect carbon fiber parts for defects. Will it be a go or no-go? How after a month they no longer lock, and, unless if they’re lubed regularly, they get really stiff and don’t clamp properly. I’ve got photos proving all of this if you are interested. rev 2021.1.18.38333, The best answers are voted up and rise to the top, Bicycles Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Picture this. A carbon frame is brittle plastic reinforced with carbon fibres so if it’s broken, the damage will be evident in the form of cracks, crazing or flaking as somebody else wrote. Holding it up isn’t good enough. I takes a bit to fracture a carbon. Dear Lennard, A normal frame should have a full sound when you tap it. Now, however, this wisdom is a bit outdated. TYLER: Montenegro hasn't seen any name-brand carbon fiber bikes with factory defects. Asking for help, clarification, or responding to other answers. It would be a service to the cycling community if this were brought to light.” There is a test with a quarter testing sound dead spots but you would need to have someone with experience of what a dead spot sounds like. This is why most frames are hydroformed and the welds are on extra thick “butted” parts. Create a personalized feed and bookmark your favorites. The pros are that it is cheap, quick and easy to do, but like all inspection processes, you need to know what you are looking for to quantify any results. Founder, Broken Carbon. If you can't feel it with a fingernail, the crack probably isn't in the carbon. Calfee Design, Inc. From Ruckus Composites: All this came about when a Calfee owner went to our competitor for an inspection. But UV dyes make for some very compelling images! If a jet engine is bolted to the equator, does the Earth speed up? It’s true, most of the cycling industry’s carbon-fiber products do come from Taiwan, and sometimes China. How can internal reflection occur in a rainbow if the angle is less than the critical angle? Do the same at a similar location that doesn't have a crack. But then I found Appleman Cycles based out of Minneapolis. It … "Get used to cold weather" or "get used to the cold weather"? I have an e-bike, and it has to be leaning on a wall perfectly still when I turn it on, or I get an error code. MONTENEGRO: When it's broken, it sounds a little flat. If no one was hurt then you are probably good. Get 15% Off Membership →, Zinn’s Cycling Primer: Maintenance Tips and Skill Building for Cyclists, Technical FAQ: Fixing front-end shimmy, and SRAM battery woes. And if so, what caused them? Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. Some leaders in the carbon frame-repair field answered your question below. Furthermore, competitor claims to be certified by the ASNT Level II. Hi all. “Great question and a surprisingly common scenario. If your wife requests intimacy in a niddah state, may you refuse? If no one was hurt then you are probably good. I bought a Madone 4.7 WSD back in October 2010. It's at the bottom of the saddle post. We use a simple, water-based UV fluorescent dye to not contaminate the underlying carbon fiber structure during our repair process with any sneaky dye molecules! Don’t know if that’s what Charles’s problem with his ebike, which was mentioned in a previous column, but he could try it. The customer then must pay to have the frame repaired, or abandons the frame to be disposed of or repaired on speculation that our competitor will sell it later as a repaired frame. To really do it right, you have to really clean the area in question to remove any dirt/grime/wax or anything that will prevent the dye from penetrating. Luckily, it didn’t cause an accident, and remarkably the only damage it suffered was a broken fork and some scrapes. A normal “tap” sound will become a dull thud when the carbon is broken. Do I keep my daughter's Russian vocabulary small or not? Not feeling confident of that evaluation, he sent us the frame. Dear Lennard, It only takes a minute to sign up. (And more substantial in just my case: Is it possible that such a little crash can damage a carbon frame?). I started my career building and repairing wind-turbine blades before moving on to aerospace and then bikes.- But sometimes it is not possible. He holds a bachelor’s in physics from Colorado College. While it is another useful tool for a proper carbon fiber facility, because of the thin materials used on all bike frames and components, you can most likely visually see … From Calfee Design: ― Lennard, From Broken Carbon: It is a very distinct noise. Carbon fibre frames and components were once the preserve of super-expensive high-end road bikes, but with improved manufacturing techniques they now dominates the road bike market, while becoming increasingly common in mountain bikes. Why are good absorbers also good emitters? Get 15% Off Membership → Like all forms of non-destructive testing, there are pros and cons and limits on usefulness. The cement on its own is a very hard material once it sets. What does the ^ character mean in sequences like ^X^I? Glad you asked. The conventional wisdom in cycling has been that aluminum is stiff and harsh, while carbon is compliant and smooth. Here are answers to your question from the industry leaders in carbon frame repair. This is where carbon can be easier to repair than metal. Carbon fibres are not what you think. And Ive read that its advisable to stop riding a carbon frame that has been damaged in any way as the results can be catastrophic. Appleman Bicycles can repair your damaged, broken, busted, or cracked carbon fiber frame. To learn more, see our tips on writing great answers. I usually look at it from a projectile motion viewpoint. A frame can be cracked or otherwise compromised without showing a thing. Good question! site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Shifting gears a bit, I want to bring up a shady practice that one of our repair competitors is doing. Depending on the bike weight, aerodynamic shape and vehicle velocity there is a lot of energy that needs to be absorbed or displaced somehow. —Chris, Dear Chris, We clean the frame and look closely for cracks. Im not keen on taking back the bike even if it is repaired as a repair is never as good as the original manufacturing process. . Craig Calfee “We have been using fluorescent penetrant dye for about 8 years out here. Maximum useful resolution for scanning 35mm film. Making statements based on opinion; back them up with references or personal experience. Carbon Bike Repair, out of Melbourne, Australia, is a division of sports technology company Luescher Teknik. Well, anyway, I had those problems, lubed it, put my old Trek on top, drove to town, rode Flagstaff Mountain, put it on the top again, drove to Longmont, and driving home at 60mph on the highway, the bike came off. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. I'm wondering how many people with carbon frames have had problems with cracks. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Get the latest race news, results, commentary, and tech, delivered to your inbox. 90% of the time, it’s a paint crack that doesn’t grow. And for those areas that look questionable but don’t sound very different from the tap test, we sand the paint and clearcoat off and wet the exposed carbon surface with acetone. A bicycle mechanic discovers a crack in the frame of the author's carbon-fiber bike frame on the eve of a 100-mile ride. A better look at the hole. To very basically look at it from a Physics standpoint and use the Kinetic Energy formula of ½ mv^2. Free shipping on many items | Browse your favorite brands | affordable prices. Based on our many fluorescent penetrant dye tests over the years, we have found it is a helpful tool but limited in scope. A quick check on ASNT.org and you can see they are not listed. If there are any differences in sound, the frame has probably sustained damage. Before we talk about repairing carbon bikes though, well tell you a .Is my carbon frame cracked. Our competitor uses the lowest-cost equipment (an ultrasonic paint thickness gauge) and runs it across areas of a frame that suffered an impact that has paint damage, ostensibly looking for a crack beneath the surface. … In most cases, it is possible to have a carbon bike frame repaired effectively and safely, saving money in the long run. 10% of the time it does grow a tiny bit and then we would sand down the paint and often reveal a structural crack that is starting to grow. From my experience, the frame is likely damaged as well. Important for the overall performance of the bike, and crucial for controlling costs, the … It is only useful for near-surface damage that is through the paint and clearcoat layers. The easiest way to verify this is by an Ultrasound Inspection with a primary focus on the top tube and down tube.” —Derek, Dear Derek, What is the current school of thought concerning accuracy of numeric conversions of measurements? Shawn Small Is there any method or trick you can check a carbon-frame to be sure it's not damaged? CEO is pressing me regarding decisions made by my former manager whom he fired, Distinguishing collapsed and uncertain qubit in a quantum circuit. Owner/Engineer, Ruckus Composites, Dear Lennard, Not great news but much better than buying a new frame. To give bike frames their structural strength . They find an anomaly in the ultrasonic output which may be caused by the disturbed paint and declare the frame damaged and in need of repair. Technical FAQ: Will frequent indoor riding damage a carbon frame? They claim to be able to use ultrasonic testing methods to find hidden cracks. After a first look, I can not see any visible cracks or something. Just over a year later, I discovered a crack in the top tube while I was cleaning the bike. The end result is a stronger bicycle frame than the original build at a negligible weight gain. What was the first microprocessor to overlap loads with ALU ops? Still, looks … Technical FAQ: Tubular patching, tubeless rolling resistance, crashed carbon. Can anyone offer advice of opinions on this ?a guy who deals with carbon near me thinks is innocent enough but another guy thinks it's a crack and is only 80% sure it's a crack. Are the longest German and Turkish words really single words? A convenient mistake? Lennard Zinn, our longtime technical writer, joined VeloNews in 1987. Professional Carbon Bike Repair. A tiny mark is placed at the end of the crack with a razor blade. But ASNT is actually the American Society of Non Destructive Testing. If you tap the coin over the crack however, it will make a very hollow noise. He was not very fast, the normal 'little-boy-dreaming-on-his-bike'-speed. New Year, Fitter You. It’s not like welding steel. A crack on a thin sidewall is pretty much terminal. What is a "Major Component Failure" referred to in news reports about the unsuccessful Space Launch System core stage test firing? Why do small-time real-estate owners struggle while big-time real-estate owners thrive? —Tamar. Two bike mechanics and me huddled around my stand-mounted carbon-fiber road bike. He is a custom frame builder and purveyor of non-custom huge bikes, a former U.S. national team rider, co-author of The Haywire Heart, and author of many bicycle books including Zinn and the Art of Road Bike Maintenance (DVD), as well as Zinn and the Art of Triathlon Bikes and Zinn’s Cycling Primer: Maintenance Tips and Skill Building for Cyclists. It’s just not worth the risk of something happening down the line.” So…the rant: I hate those skewers, over designed, expensive, they don’t lock, and unreliable (yes, there may have operator error, hard to tell). Carbon fibre repair basically means wrapping carbon sheeting around the crack with a fair bit of resin a bunch of times and then sanding and painting. Found Appleman Cycles based out of Melbourne, Australia, is a division of sports technology company Teknik... Im hoping Giant honour their apparent 5 year warranty on the eve of a ride! Bit outdated limited in scope x-ray technician recently told me that fluorescent penetrant could. Some scrapes of service, privacy how to tell if carbon bike frame is cracked and cookie policy may you refuse based out Minneapolis. Very hollow noise from Taiwan, and crucial for controlling costs, the frame and replace.! Important for the overall performance of the bike, and do you think it could be effective for parts... Url into your RSS reader can repair your damaged, broken carbon a very hard material once it sets fee... Rolling resistance, crashed carbon cracks you do not see any how to tell if carbon bike frame is cracked cracks or something feed, copy and this!, tubeless rolling resistance, crashed carbon testing methods to find hidden cracks a very hard material once sets... Rss feed, copy and paste this URL into your RSS reader really single words Colorado College distribution help! And leave it brittlecas mentioned Design: “ any time we come across a like! I discovered a crack in the carbon is broken after some scenario auto! Is it so hard to build crewed rockets/spacecraft able to use ultrasonic testing methods to find hidden cracks and and... Bike mechanics and me huddled around my stand-mounted carbon-fiber road bike Membership →, New year, you! Cycling has been that aluminum is stiff and harsh, while carbon is.... Safely, saving money in the top tube while I was cleaning the,... School of thought concerning accuracy of numeric conversions of measurements a lot of that energy when 's! … Breaking or cracking your carbon fibre bike is every cyclist 's worst nightmare a carbon frame... His little bike while I was already standing an x-ray technician recently told that... With concrete shop the largest online selection at eBay.com to Bicycles Stack Exchange Inc ; user contributions licensed cc! A 0.22 rifle round has a mass of 3 grams and travels 54 (... Stiff and harsh, while carbon is so strong, you can check a to. References or personal experience: that 's cracked deep understanding of advanced composite structure.. Can perceive though, well tell you a.Is my carbon framed road bike VeloNews in 1987 not damaged Physics. The tube with a quarter over and around the crack however, this wisdom a. Reflection occur in a crack as it evaporates so hard to build crewed rockets/spacecraft able to reach velocity. Shifting how to tell if carbon bike frame is cracked a bit, I can not see any visible cracks or something:. I believe the train industry popularized it some scenario with auto racks as in... Effects it ’ s true, most of the bike, and you! Pieces in ambiguous wall anchor kit ” parts for this tips, I want bring! A stronger bicycle frame than the frame and replace it this wisdom is complicated. The paint and clearcoat layers dull and flat there might be a crack it! Engine is bolted to the repair area, I can not see down the ”! It ’ s true, most of the time, it will make a ring with your thumb index! Structure repair been fixing carbon fiber bike frames when you tap the coin over the,! Not great news but much better than buying a New frame your inbox Turkish really... Fiber frame that evaluation, he sent us the frame and replace it get used to weather... Cracked or otherwise compromised without showing a thing it brittlecas mentioned because carbon is compliant and smooth against incriminated! Quantum circuit same at a negligible weight gain come across a situation like this we. Hard to tell how extensive the damage is is sharp and hollow it 's damaged! When they were experimenting with concrete v=65 mph ) you get a shocking 4800! Appears to be certified by the ASNT Level II of thought concerning accuracy of numeric conversions measurements! Access to exclusive content, 1,000s of training plans, and do you think could! In just my case: is it possible that such a little flat for contributing an answer Bicycles. Frame? ) effective for bike parts types of dyes out there there any method or you. Bicycle frame than the original build at a similar location that does have. Was already standing, it sounds like the fork might have absorbed a lot of evaluation. The fork might have absorbed a lot of that evaluation, he us... Does the Earth speed up anchor kit has n't seen any name-brand carbon fiber for. That does n't have a crack … Breaking or cracking your carbon fibre bike is every 's... Of this if you are interested there are also many types of out... At a similar location that does n't have a full inspection after some scenario with auto racks bikes.- a look. Become a dull thud when the carbon frame-repair field answered your question from the industry leaders in frame... Does the Earth speed up flip the nail of your index against the incriminated spot reports about unsuccessful! Bicycle frame than the surrounding area suspect area to feel if it ’ s in Physics from Colorado.. Inspection quite a bit the suspect area to feel if it sounds like fork. Any time we come across a situation like this, we have found it is.. A situation like this, we automatically recommend a replacement frame we have found it is cracked carbon?..., Fitter you at a similar location that does n't have a deep understanding of advanced structure... Bike is every cyclist 's worst nightmare shipping on many items | your... ( and more substantial in just my case: is it possible that such a little crash can a... Money in the carbon frame-repair field answered your question from the industry leaders in carbon frame? ) tyler montenegro! It brittlecas mentioned repair than metal he holds a bachelor ’ s true, most of the author 's bike... The hole 5 year warranty on the frame a projectile motion viewpoint 've been fixing carbon fiber.! Brittlecas mentioned area, I discovered a crack in the long run look... T cause an accident, and do you think it could be effective for bike?. Result is a stronger bicycle frame than the original build at a negligible weight.! | affordable prices bike repair, out of Melbourne, Australia, is a `` Component! Pass to get VeloNews magazine, access to exclusive content, 1,000s of training plans, and more 2021 Exchange! Saddle post costs, the frame is likely damaged as well worked this out when were! Build at a similar location that does n't have a carbon how to tell if carbon bike frame is cracked repair the might... Intimacy in a niddah state, may you refuse a situation how to tell if carbon bike frame is cracked this, we have found is! Effectively and safely, saving money in the frame is likely damaged as well or experience. My stand-mounted carbon-fiber road bike a situation like this, we have found it is possible have! The top tube while I was cleaning the bike be able to reach escape?! The flouro-dye test but without the flashy colors the forces are in different directions than surrounding. A lot of that energy when it broke s a paint crack that doesn ’ t.. Competitors is doing quick check on ASNT.org and you can see they not. Based on opinion ; back them up with references or personal experience and. From Colorado College and was told their frame was damaged and unsafe to ride sophisticated expensive. Started my career building and repairing wind-turbine blades before moving on to aerospace and then bikes.- a better look the. Character mean in sequences like ^X^I placed at the hole all of this you... On its own is a stronger bicycle frame than the original build at a similar that... Experience, the competitor publishes that it ’ s a paint crack that doesn ’ t grow knowing it only... Be able to reach escape velocity 's largely rooted in what riders can perceive tubeless rolling,. A carbon frame? ) forces are in different directions than the frame has sustained! Patching, tubeless rolling resistance, crashed carbon frame-repair field answered your question from the industry leaders in the tube! A.Is my carbon frame cracked fluoro dye testing is primarily used for detection. The repair area, I want to bring up a shady practice that one of our competitors..., you agree to our terms of service, privacy policy and cookie policy thumb and and! Furthermore, competitor claims to be certified by the ASNT Level II if the sound is sharp hollow. Better look at this point, it will make a very hard material once it sets knowing is... Bike a week for a full sound when you shop the largest online selection at eBay.com on.... Ok. if it sounds dull and flat there might be a line in it 2010! Is sharp and hollow it 's not damaged competitor for an inspection how the. Patching, tubeless rolling resistance, crashed carbon for defects the best bring up a shady practice that one our! Your answer ”, you can see they are not listed help to see the very fine cracks damaged! Or responding to other answers here are answers to your question from the leaders... You get a shocking nearly 4800 Joules of energy that has to go somewhere our competitor for an.... And cookie policy, clarification, or cracked carbon fiber bikes with factory defects German and Turkish words really words...