i just installed mine and WOW! nice low end power mod.

unfortunately, i've been hearing some horror stories about crank bearings wearing down, leaks, and such. has anyone installed and underdrive crank pulley? any problems? how long have you had it on?

 

Try the search function, people have been installing UD pulleys for a while and there are some very informative threads.

 

i tried searching. couldn't find much. what i did find, though, is exactly what i thought i'd find.... mixed reviews. my friend bought me an underdrive pulley set off of ebay - possibly bad news. i went ahead and bought an unorthodox crank pulley just in case.