Carbon seat tube crack

When choosing a seatpost clamp, there are several key considerations to keep in mind. A section had become delaminated due to severe loacalsied impact. We cut out the damaged area and replaced with new carbon, we then produced a kuota logo and matched the existing paintwork. This is the steel and carbon odonata, with the seat tube being carbon.

Another is that the crack is at the bottom of where the seat post rests in the frame and it has cracked from too much leverage being put on the seat. Whatever carbon fiber tube styles you want, can be easily bought here. First, most cracks in an aluminum frame, especially when they are in the tube rather than at a weld signifies fatigue. When using a carbon post, its very important to have the seat collar slot on the opposite side of the seat tube slot. Two questions regarding probable broken seat stay carbon. Every now and again, were all faced with going on a diet, and the same is true for our fatboy. I noticed a slight wobble in my saddle while riding home from work today, and as i was checking the quick release on the seat post i noticed what looks like a serious crack where the top tube meets the seat post. Bmc down tube crack after 2 bmc down tube crack before 1. It features a sophisticated 10m carbon construction thats lightweight, ultracompliant, and stiff in all the right places for the climbs. Thats costly, so it pays to start with a bit of common sense. Me, if the new tube is now extends lower than the cracks i ride.

If you have a seat tube with an inner diameter of 28. I had seen similar cracks like this before but they were labeled as crack in the paint instead, not in the carbon layup. Hi, theres a line on a carbon seat tube, and i need your help to determine if the line is just a scratch or a crack. They responded to my phone call and email immediately. Finish line fiber grip carbon fiber bicycle assembly gel. If you want to buy cheap carbon fiber tube, choose carbon fiber tube from. A carbon seat post is a pretty rigid structure and difficult to compress to the extent that that tab of material would actually snap. If you squeeze the seat tube where the top cut outs are, you can see that part of the carbon has separated from the main seat tube. Carbon fibers cannot take being crushed like that, and the carbon layers will crack and delaminate in response.

A common, and scary, place that frames crack is the underside of the down tube, just behind the headtube. Felt bicycles recalls mountain bikes with oem carbon fiber. Carbon bike repair came highly recommended by 2 local bike dealers after crack in rear seat stay found. Uni is short for unidirectional however 99% of uni tubes are comprised of varying angle oriented fibers. Additionally, theres a crack on the right side closest to the camera about 4cm where the paint and the outermost layer of carbon lifted up. I was tightening up the seat post clamp on my new bike as hard as i could and still the seat post was slipping down the seat tube on a ride. I have since done extensive research and reading on the subject too late i know so i know i should get a torque rench and be more careful but my main concern at this stage is how bad this crack. What is the average price range of a carbon repair from your shop. From your description, though, i dont think theres enough of the seat tube to get away with this. Dear lennard, i have a cracked carbon fiber seatpost. Great for road or mountain use and available in a slew of diameters, lengths and offsets, this. When you get sorted, its worth buying a small torque wrench for jobs like that. Before tightening seatposts, pay particular attention to the orientation of the seat collar.

Frame capra carbon 29 high modular carbonfiber frame, v4l virtual 4link rear suspension, 148x12mm dt swiss qr thru axle, down tubeseat staychain stay protection. Dear fellow riders, this is my first post here please be kind i got my first ever carbon bike a coupe of weeks ago and i guess i cracked the seat tube by over tightening the seat post. Carbon cranks and wheels from ethirteen and the renthal fatbar carbon handlebar keep the weight low and round out the capra 29 cf pro race build in style. That small little crack below my seat collar looks like just a paint crack, probably from the flexing of the seat tube. Carbon bikes should only be clamped on the seat post, not the seat tube. I removed the seat post and discovered a 1cm vertical crack at the top of the seat tube as well as a crack on the seat post itself. If it freezes, the ice expansion can burst or crack the frame making it unsafe to ride. Ukc forums carbon seat tube crack, possible shop negligence. Modern 2017 carbon is quite amazing and much safer than older carbon because of better. Dont take this as gospel, but id have thought that if its ok to cut a carbon steerer tube which it is, it cant be disastrous to cut a carbon seatpost.

I also put on more carbon paste and slacked off a bit on the seat clamp. The felt logo is on the down tube of the double double 30 and the ninee20, and on the top tube of. That is why calfee uses a fiberglass sleeve as a seat tube shim. I pretty sure epoxy has a low coefficient of thermal expansion too. And dont tell your wife the cracks are from having the seat too high. Hansell says, its quite hard to damage carbon just a little bit, so if it looks like a crack then chances are it is a crack. Our new carbon fiber pro seatpost does that and more with a reliable 2bolt design that lets you swap saddles with ease. The carbon seat bottle cage mount allows you to mount two cages on your carbon seat while drilling only two small holes in the center of the seat, where they are away from the edge and much less likely to propogate a crack in the event of an accident. Do the same at a similar location that doesnt have a crack. This is my first carbon frame so not sure what to think.

Should i use jb weld or aluminum epoxy to fix a crack on. I would ask the shop that found the crack to look for others. Wd40 will not damage the epoxy holding the carbon fibers together. Has anyone here had this type of damage repaired before. Bmc seat tube junction after bmc seat tube junction before. Toseek carbon fiber bike seat post bicycle seatpost bicycle seat tube for mtb road bike matt 27. A seatpost should do one thing well hold your seat. Cannondale employs its own compact cranks with the crossstandard 4636 rings. The carbon fibre assembly paste solved the problem. My frame has a crack in the seat tube just below the seat tube clamping area. On dropping bike off was really impressed with the workshop and with how they explained the processes they follow. This is the true workhorse of our carbon fiber tubing products, but the name is slightly misleading. Instead mark your seat height by wrapping a piece of electrical tape around it right at the frame.

Other than that i dont know of any tried and tested methods. A carbon sleeve on an aluminum post will result in corrosion of the post. If this one isnt found in time, the result is usually catastrophic failure and a trip to. The bicycles were sold with carbon fiber seat posts. With a crack running up the tube id be asking them about their layup schedule. In this age of compact frames, the superx sports a relatively tall seat tube.

I am going to invest in some carbon paste anyway as i think, as with a torque wrench, if you have carbon, these are good things to have at hand. So if you can heat the seat tube a little, it might help some. The name is assigned simply to designate that the tube has an outermost layer of unidirectional carbon fiber instead of a woven fabric. Received a frame yesterday and on inspection today found a series of thin cracks around the top tubeseat tube joint integrated seat tube. If there are any differences in sound, the frame has probably sustained damage.

Aluminum seat tube or sleeve and a carbon post will result in corrosion of the frame and possible seizure of the post within the frame. I was worried that the seatpost had a crack in it and also because of the slight clicking noise, so i took it to a bike shop and they put on carbon paste and tightened it for me and so far, so good. Im building up a seven odonata that i bought last year from another member of this forum. I believe unless youre running your seat post with only two inches. Id expect the outer layers on any seatpost to be bias wrapped, theres little strength to be had from fibres. When i removed the seatpost clamp on my kuota, i noticed that the seat tube is developing a small crack at the clamping zone.

Carbon bicycle and component care trek bicycle store. I have a felt b2 carbon time trial bike, with carbon seat post, it has developed a bad creaking noise where the seat post goes into the frame. The model name is printed on the top tube of the bicycles. Unidirectional carbon tubing engineered carbon fiber. There are a number of carbonrepair services popping up in the back of bike shops, but small says ruckus is one of the few outfits that focuses only on carbonfiber repairand that.

Regardless of use, storage or age, no carbon bike or fork should be used after 10 years. This is the second in four months, and this one failed after less than 25 rides. Its unlikely that any carbon seat tube design would take an expanding topper without spacers, as the internal pressure to maintain height would likely crack the tube before it could brace itself enough against the interior walls to maintain height over rough roads. The crack on the seat tube literally goes all the way around and is just underneath the clamp. With the new fatboy comp carbon, weve elevated the fat bike platform to a higher level of performance, strength, and efficiency. If the seatpost was too small for the frame tube, it might be possible. Another trick is to whack the tube with a quarter over and around the crack. I used a torque wrench and it wasnt anywhere near 12nm when i heard the crack. Do not attempt to repair cracks on any bicycle frame regardless of material with jbweld or any type of epoxy. This recall involves all model year 2015 felt double double 30, ninee 20 and edict 1 mountain bicycles. It endeavors to provide the products that you want, offering the best bang for your buck. Jensonusa carries an expansive inventory of seatpost clamps from respected brands like salsa, thomson, tune, hope, and many others.

Carbon fiber cannot be visually inspected and many parts have only a oneseason life span. Look cycles also use an internal topper for their proprietary design called epost. There are no cracks in the frame or seat post,have tightened all fixing bolts but does not solve the problem, bike shop advises that i must not use a lubricant on carbon. There is a crack in the center of the carbon, about 2cm long where the seat tube made the layup in the back bow out. Id guess that if there is any risk, its due to the possibility that cracks could grow from the cut surface but this isnt too likely because the post isnt under the kind of stresses. Building up a frameset before building up a frameset, consult with your cannondale dealer and the. Ive seen a lot of documented cases from both professional repairers and diyers of cracksholes further down the tubes which have been repaired by wrapping new carbon around the whole circumference of the tube but not seen any beforeafter pictures of this type. How to tell if a carbon frame is damaged or if the paint. If you cant feel it with a fingernail, the crack probably isnt in the carbon.