OK, so I had a fork with an IS mounted disk brake and 160mm rotor. I got a new frame/fork. The new fork had a post mount and the frame an IS mount. I planned to just get a new brake for the front and use the IS brake from my old fork as a rear brake. Unfortunately the rotor is too big to be used with that caliper on the rear. If this is common and someone knows what to do, do I just need a smaller rotor and I'm good? If so, what size would I need?
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