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Discussion Starter · #1 ·
My front disc brakes are XTR M975, ISO style, the distance b/w the mounting bolts is 51mm, and my rotor diameter is 160mm. The new fork I'm looking to get is a Reba which I understand is a post-mount w/ a distance of 74mm b/w the mounting bolts.

Is there an adapter I can get? I haven't been able to find one that adapts a 51mm ISO caliper to a 74mm post-mount.
 

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I don't want to hijack but I am considering a 180mm rotor for my 36 Float with xt brakes. Is this what I would need?
 

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Vaginatarian
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5,686 Posts
shimano brake adaptors use a system
sm-ma-f180s/p = front 180mm standard mount caliper p post mount fork
sm-ma-r180 p/s= rear 180mm post mount caliper standard mount frame

just to confuse you a rear standard caliper is either 140 or 160mm without adaptors (should say on the caliper) but you can also use it on the front
but you add 20mm so a rear 160 = a front 180 and vice versa a front 180 would be a rear 160 without adaptors and standard mount
 
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