Carbon seat tube crack

The model name is printed on the top tube of the bicycles. I pretty sure epoxy has a low coefficient of thermal expansion too. That is why calfee uses a fiberglass sleeve as a seat tube shim. When choosing a seatpost clamp, there are several key considerations to keep in mind. 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. It endeavors to provide the products that you want, offering the best bang for your buck.

I would ask the shop that found the crack to look for others. My frame has a crack in the seat tube just below the seat tube clamping area. 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. What is the average price range of a carbon repair from your shop. They responded to my phone call and email immediately. 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. Our new carbon fiber pro seatpost does that and more with a reliable 2bolt design that lets you swap saddles with ease. A common, and scary, place that frames crack is the underside of the down tube, just behind the headtube. Building up a frameset before building up a frameset, consult with your cannondale dealer and the. If the seatpost was too small for the frame tube, it might be possible. A carbon seat post is a pretty rigid structure and difficult to compress to the extent that that tab of material would actually snap.

Instead mark your seat height by wrapping a piece of electrical tape around it right at the frame. Has anyone here had this type of damage repaired before. Great for road or mountain use and available in a slew of diameters, lengths and offsets, this. 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. Dear lennard, i have a cracked carbon fiber seatpost. In this age of compact frames, the superx sports a relatively tall seat tube. Felt bicycles recalls mountain bikes with oem carbon fiber. Cannondale employs its own compact cranks with the crossstandard 4636 rings. How to tell if a carbon frame is damaged or if the paint. 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. Wd40 will not damage the epoxy holding the carbon fibers together. 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.

Carbon fibers cannot take being crushed like that, and the carbon layers will crack and delaminate in response. This is my first carbon frame so not sure what to think. 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. If you have a seat tube with an inner diameter of 28. This is the steel and carbon odonata, with the seat tube being carbon. The carbon fibre assembly paste solved the problem. Before tightening seatposts, pay particular attention to the orientation of the seat collar. I also put on more carbon paste and slacked off a bit on the seat clamp.

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. That small little crack below my seat collar looks like just a paint crack, probably from the flexing of the seat tube. 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. Bmc down tube crack after 2 bmc down tube crack before 1. When using a carbon post, its very important to have the seat collar slot on the opposite side of the seat tube slot. When i removed the seatpost clamp on my kuota, i noticed that the seat tube is developing a small crack at the clamping zone. A seatpost should do one thing well hold your seat. When you get sorted, its worth buying a small torque wrench for jobs like that.

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. If there are any differences in sound, the frame has probably sustained damage. 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. 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. And dont tell your wife the cracks are from having the seat too high. This is the second in four months, and this one failed after less than 25 rides. 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. Should i use jb weld or aluminum epoxy to fix a crack on. 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.

From your description, though, i dont think theres enough of the seat tube to get away with this. The bicycles were sold with carbon fiber seat posts. On dropping bike off was really impressed with the workshop and with how they explained the processes they follow. We cut out the damaged area and replaced with new carbon, we then produced a kuota logo and matched the existing paintwork. Thats costly, so it pays to start with a bit of common sense. Carbon fiber cannot be visually inspected and many parts have only a oneseason life span. Every now and again, were all faced with going on a diet, and the same is true for our fatboy. Other than that i dont know of any tried and tested methods. 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. Look cycles also use an internal topper for their proprietary design called epost. If this one isnt found in time, the result is usually catastrophic failure and a trip to. Me, if the new tube is now extends lower than the cracks i ride.

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. With a crack running up the tube id be asking them about their layup schedule. A section had become delaminated due to severe loacalsied impact. Frame capra carbon 29 high modular carbonfiber frame, v4l virtual 4link rear suspension, 148x12mm dt swiss qr thru axle, down tubeseat staychain stay protection. Finish line fiber grip carbon fiber bicycle assembly gel. 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. I used a torque wrench and it wasnt anywhere near 12nm when i heard the crack. 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. The crack on the seat tube literally goes all the way around and is just underneath the clamp. If you cant feel it with a fingernail, the crack probably isnt in the carbon. If it freezes, the ice expansion can burst or crack the frame making it unsafe to ride. Carbon bike repair came highly recommended by 2 local bike dealers after crack in rear seat stay found. The name is assigned simply to designate that the tube has an outermost layer of unidirectional carbon fiber instead of a woven fabric.

Toseek carbon fiber bike seat post bicycle seatpost bicycle seat tube for mtb road bike matt 27. Uni is short for unidirectional however 99% of uni tubes are comprised of varying angle oriented fibers. Whatever carbon fiber tube styles you want, can be easily bought here. This is the true workhorse of our carbon fiber tubing products, but the name is slightly misleading. Two questions regarding probable broken seat stay carbon.

A carbon sleeve on an aluminum post will result in corrosion of the post. Received a frame yesterday and on inspection today found a series of thin cracks around the top tubeseat tube joint integrated seat tube. 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. Carbon bicycle and component care trek bicycle store. 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. Do not attempt to repair cracks on any bicycle frame regardless of material with jbweld or any type of epoxy. Im building up a seven odonata that i bought last year from another member of this forum. Regardless of use, storage or age, no carbon bike or fork should be used after 10 years. With the new fatboy comp carbon, weve elevated the fat bike platform to a higher level of performance, strength, and efficiency. This recall involves all model year 2015 felt double double 30, ninee 20 and edict 1 mountain bicycles. The felt logo is on the down tube of the double double 30 and the ninee20, and on the top tube of. First, most cracks in an aluminum frame, especially when they are in the tube rather than at a weld signifies fatigue. If you want to buy cheap carbon fiber tube, choose carbon fiber tube from.

Another trick is to whack the tube with a quarter over and around the crack. Carbon bikes should only be clamped on the seat post, not the seat tube. I had seen similar cracks like this before but they were labeled as crack in the paint instead, not in the carbon layup. Jensonusa carries an expansive inventory of seatpost clamps from respected brands like salsa, thomson, tune, hope, and many others. Bmc seat tube junction after bmc seat tube junction before. Do the same at a similar location that doesnt have a crack.