Need help. I upgraded from a 180 to 200 rear rotor and after doing research, it said I needed 40mm post mount (same as my front). However, the brake calipers are barely catching the rotor. Any idea what I did wrong? 20mm post mount be the right one? Even when I flipped the 40mm around, it still didn’t fit correctly.
by stk-shuttles
3 Comments
Did you put a +40mm post mount on a 180mm post mount?
180+40=220
but check your frame specs. If that’s the case want a 20mm. what was it mounted on before?
Either that or you put it on backwards.
20mm post mount is what you’re looking for.
180+40=220
180+20=200