My new e bike conversion has to use a 140mm rear disc due to the wide hub motor to not rub in the frame .
Can I just use any old hydro rear brake with the appropriate adapter , I have a spare Shimano XT ?
alot of frames are made for a minimum 160mm rotor with the brake calliper being mounted direct to the chain stay. it really depends on the frame, and ofcourse post mount or IS mount
Shouldn't be a problem. I used a 140mm rear rotor on my 26" bike (still do) for years with an XTR caliper and the appropriate 160F/140R ISO to PM adapter. However, if it's a PM frame then typically the minimum rotor size is 160mm.
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