|Giant TRC1 Composite - BB Knocking||Bananaman|
Jan 12, 2003 2:03 AM
|I recently bought the new Giant carbon TCR1 with full Ultegra groupo. When I stand up and put my weight on the pedals I usually get a knocking noise coming from the bottom bracket area. I understand that aluminium frames have the same problem but surely not on carbon frame bikes.
Has anyone else experienced the same thing?
|That's NOT normal, regardless of frame material.||JS|
Jan 12, 2003 9:57 AM
|My first guess is that a crank arm is working loose, check both with an 8mm allen wrench. If not that or the BB died already(which I doubt) check the bonding of the frame near the BB. Good luck.|
|That's NOT normal, regardless of frame material.||Bananaman|
Jan 12, 2003 4:41 PM
I'm going to dismantle the cranks and BB to check, grease and reassemble cups and bolts to the recommended torques. I'll also use ptfe tape (plumbers tape) around the BB cups. I read that this ensures threads mate together correctly by taking up the 'tolerance' between threads.
My feeling is that I shouldnt be doing this to a brand new bike but it'll give me the experience since I havent done it before.