I am putting an SLX brake caliper on my post mount fork, with a 180mm rotor (shimano RT-76 6-bolt).
My rotors haven't arrived yet, but I was going to mount up the calipers so I could cut the hoses to length.
So I started tracking down adaptors and found one of these at the LBS:
This ^ one has the code SH-MA90-F180P/P. The one I have is SH-MA-F180P/P2. They are identical otherwise.
LBS mechanic assures me it will work, but just holding everything in place with an old 180mm centrelock rotor it looks way tight, like the rotor may sit too high in the caliper (barely 1mm between outer rotor edge and caliper groove). But ... this is just holding rotor in place - not mounting.
I have seen reference to another adaptor: SH-MA-F180P/P, which looks like this:
So which one do I need for everything to interface perfectly? SH-MA-F180P/P? or SH-MA-F180P/P2?
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Thread: Which 180mm front brake adaptor?