Could you flip an adapter around to go from 180 to 160? Even if you had to make such an adapter, it would still be cheaper than cutting a new disc and getting it riveted to the Powertap carrier.
Hmmmmmm.
I assume the caliper has to straddle the adaptor to a degree.
Defo better than a custom rotor.
@Smallfurry started
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Could you flip an adapter around to go from 180 to 160?
Even if you had to make such an adapter, it would still be cheaper than cutting a new disc and getting it riveted to the Powertap carrier.