CTJ Posted July 20, 2015 Posted July 20, 2015 I went out for a training ride this morning - hill intervals to be exact. When i kicked on the steeper part of the climb my rear wheel suddenly locked up. Long story short the rear wheel was buckling so badly that even after I opened the brake calipers it still touched both sides. Inspected the wheel when I got home and found the rear hub had cracked - see pic attached. It is a Ksyruim SL 2009 Model.Wheels were completely re-spoked by Mavic 2 weeks ago. 1) Has anybody seen this before?2) Is this a known problem with these wheels? 3) What could have caused this to happen?4) Any chance the respoking of the wheels could have led to this? (Faulty workmanship?)
Skinnyone Posted July 20, 2015 Posted July 20, 2015 When you say it was respoked by Mavic did you send it to Dragon sports to do the job or did your LBS do it? Respoking it may have caused it but where it is cracked I don't think it is down to bad workmanship, if it was over tensioned then the flange where the spokes sit would have more likely cracked...this may have been down to a bad bearing change at some point. Could be Fatigue as it is a 2009 model wheel. Bearing changes in the wheels life could have been a factor in this fatigue as well and the timing of the respoke could be coincidental. Definitley not a known fault, my thinking is the fatigue route...
Skinnyone Posted July 20, 2015 Posted July 20, 2015 Send it back to who did the job and Dragons will need to inspect it and make a call...Highly unlikely a warranty given the age of the wheel...
velomonatiCT Posted July 20, 2015 Posted July 20, 2015 just an uneducated opinion and im sure there are more qualified ones on here but Ill bet badly tensioned spokes (a lot more than one because then just the spokes would have failed ) could have caused the hub to failif it didn'tand if it was an existing crack that been going for a whileand assuming you didn't damage it in some other way (just saying)then the crack must have been there and why didn't the wheel builder notice it when he respoked the wheel
Skinnyone Posted July 20, 2015 Posted July 20, 2015 just an uneducated opinion and im sure there are more qualified ones on here but Ill bet badly tensioned spokes (a lot more than one because then just the spokes would have failed ) could have caused the hub to failif it didn'tand if it was an existing crack that been going for a whileand assuming you didn't damage it in some other way (just saying)then the crack must have been there and why didn't the wheel builder notice it when he respoked the wheelTypically if all the spokes are over tensioned then the rim will give way first or else the spokes will give way. Also the wheel will be impossible to get true. All rims and wheels have a point where if you go over the limit they will start to display weird tendencies like not staying true whilst trying to true it. Probably an existing crack internally caused by a bad bearing change. Aluminum is a material that if there is a stress crack it is not always easy to see - hence why the wheelbuilder did not pick it up. Where that crack has developed is directly behind where the bearing sits...
velomonatiCT Posted July 20, 2015 Posted July 20, 2015 Typically if all the spokes are over tensioned then the rim will give way first or else the spokes will give way. Also the wheel will be impossible to get true. All rims and wheels have a point where if you go over the limit they will start to display weird tendencies like not staying true whilst trying to true it. Probably an existing crack internally caused by a bad bearing change. Aluminum is a material that if there is a stress crack it is not always easy to see - hence why the wheelbuilder did not pick it up. Where that crack has developed is directly behind where the bearing sits... my uneducated opinion stands corrected thanks for the education skinny
Skinnyone Posted July 20, 2015 Posted July 20, 2015 my uneducated opinion stands corrected thanks for the education skinny HAha no sweat...
CTJ Posted July 20, 2015 Author Posted July 20, 2015 When you say it was respoked by Mavic did you send it to Dragon sports to do the job or did your LBS do it? Respoking it may have caused it but where it is cracked I don't think it is down to bad workmanship, if it was over tensioned then the flange where the spokes sit would have more likely cracked...this may have been down to a bad bearing change at some point. Could be Fatigue as it is a 2009 model wheel. Bearing changes in the wheels life could have been a factor in this fatigue as well and the timing of the respoke could be coincidental. Definitley not a known fault, my thinking is the fatigue route... Bearings are still the original ones - still running as smooth as the day I got them. Respoked by the guys at Mavic. LBS sent the wheel to them.
CTJ Posted July 20, 2015 Author Posted July 20, 2015 Typically if all the spokes are over tensioned then the rim will give way first or else the spokes will give way. Also the wheel will be impossible to get true. All rims and wheels have a point where if you go over the limit they will start to display weird tendencies like not staying true whilst trying to true it. Probably an existing crack internally caused by a bad bearing change. Aluminum is a material that if there is a stress crack it is not always easy to see - hence why the wheelbuilder did not pick it up. Where that crack has developed is directly behind where the bearing sits... Bearings are still the original ones - still running as smooth as the day I got them. Respoked by the guys at Mavic. LBS sent the wheel to them.
droo Posted July 22, 2015 Posted July 22, 2015 Too much power. If you also regularly bend cranks and pedal axles I'd suggest cutting back a bit on the PEDs.
CTJ Posted July 28, 2015 Author Posted July 28, 2015 Too much power. If you also regularly bend cranks and pedal axles I'd suggest cutting back a bit on the PEDs.Thanks Man!! If only this was the case........
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