You have a set? The front is 160mm IS also? If that is the deal with the front, then you could switch the front caliper to the rear on a 140mm rotor and put the rear caliper on the front with a +20mm adaptor and a 160mm rotor. Robert, as "they" say, would be your uncle.
A forum community dedicated to Mountain Bike owners and enthusiasts. Come join the discussion about bike parts, components, deals, performance, modifications, classifieds, trails, troubleshooting, maintenance, and more!