Underdrive Pulleys

What a difference!! Once the computer had about a week to get used to these pulleys the increase was considerably noticeable. Not only do they turn your accessories less, but they are much lighter. The reduction in "rotating mass" is where the real gain in acceleration came from. Getting smaller belts that were "just right" was a bit of a pain. Also had to tighten them up a bit after about 6 months. The picture does not due justice to how much smaller and lighter these are.