Join Date: Dec 2004
Bikes: 92 Giant Sedona ATX Custom
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If your frame is a IS mount instead of a post mount you can get an adapter to either size. I have used both on the rear of my mtb(currently has 140 on the rear 160 front). The 140 rotor is a little harder to lock up, which can be a good thing depending on what you are out for. The adapter is not expensive, so if you get the rotor/caliper combination fitted and find it does not meet just check your shop and they can order it for you.