I'm purchasing a set of Magura Marta SL's that are both IS mounting, and want to put the front on my Manitou Super Air fork (post mounting). Can I do this with an adaptor, or do I need a different caliper altogether?
Its impossible to fit an IS caliper ona post mount fork with a 160mm rotor. It has to be a minimum of 170mm. The only ones to make such an adapter and rotor are Shimano. If you want to go with standard sizes you need to go 180mm rotor/adapter.
If you get a set of 160mm IS mount Martas, in order to make it work with your Manitou fork would be to get a $25 bracket and a 180mm rotor. You just can't make a 6in IS caliper mount up to the Post Mount without screwing up the spacing. Oddly enough, you can go the other way around.
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