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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
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Why would a waif like you need anything more than 160 mm rotors?
makko
andyp
@Cupcakes
Pompetamine owners, please weigh in with reports of what rear disc calipers (and rotor size) you have managed to fettle to work well.