New answers tagged repair
1
I graciously disagree with the troublshooting approach already mentioned. Not that there is anything wrong with checking the things mentioned, but because the OP described the chain going slack on the top when pedaling backwards, there are other things that should be checked first.
How worn is your chain? probably a lot after 2500km. I have found that a ...
-1
Does not fit older shimano gear lever band on as threads are different
9
What’s happened here is that you have expanded the diameter of the top of the seat tube, in the process it looks like you have made some small cracks on the top edge, and created a number of burrs. That’s why the original seat post clamp will not fit anymore.
The larger clamp obviously does not work as its diameter is too large to clamp down on the tube with ...
0
As mentioned in comments the crank arm is wrecked and needs to be replaced. Once the square taper hole in the crank starts to deform (and yours is quite bad) it's impossible to get them to stay on tight and the problem gets progressively worse.
If the axle square taper is undamaged you should be able to simply purchase replacement crank arms. The square ...
2
Either the rear wheel or the crank bearings are binding at some point in their revolution, or (or possibly there's something going on with the chain). The first thing to do is track down where the problem is.
Check first for obvious stuff, like is the rear wheel out of true and rubbing the brake blocks?
The next easiest thing to do first is take the rear ...
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