Hey guys! A friend gave me a 10 speed which is in pretty aweful shape. The rear shifter doesn't budge and the derailure is encased in bright orange rust. it is stuck on the middle gear. The front shifter works fine.
Is it unheard of to remove the rear shifter and put a fixed cog back there, and leave the front gears as they are? Is that a big no-no in the world of fixed gears?