Depends of the tyre choice, 160mm works well if tire is small enough to slam the wheel. I had 42's and for those you need to take the wheel way back in the dropouts and you'll need 180mm disc because you can't get the caliper back enough.
Had bb7's
Interesting! Thanks.
180mm disc on a 160mm adaptor, or 180 on 180?
180 disc with 160 adaptor if i recall.
Best pic i could find Axle all the way back in the dropout, 42mm fit barely With smaller tyres 160mm disc is fine
@Cupcakes started
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Depends of the tyre choice, 160mm works well if tire is small enough to slam the wheel. I had 42's and for those you need to take the wheel way back in the dropouts and you'll need 180mm disc because you can't get the caliper back enough.
Had bb7's