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1

Crank preload is there to ensure that cranks are not over tightened so that they cause premature failure of the bearings. It allows the cranks to be "finger tightened" prior to the pinch bolts been done up to the right torque. It's a way of ensuring the spacing is correct on the crank axle.


3

Well, going SRAM means new shifters and new derailleurs (and while you're at it, you may as well install all new cable housings and cables). Depending on your hub, you may need to get a new hub (or more likely, a new rear wheel) to fit a 9/10 speed cassette that the current x7 group uses -- however if you have an 8/9/10 speed freehub already, you should be ...



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