Review on 🔧 Enhance Performance with SHIMANO Unisex RD-6700 Tension & Huide Pulley Set in Black – Available in a Single Size by Shree Carmean

On my 2007 Ultegra 9 speed road bike I'm trying to reduce energy loss on the road (I know buying a new bike might be easier ;-) I have clogged pulleys noticed didn't work loose enough that I figured a quick win would be to replace them. To my dismay and subjective "measurements", these brand new pulleys showed no less friction than the old dirt-filled pulleys. The top pulley is particularly bad as the protective metal disc seals the rubber o-rings as they rotate against each other. I expected this kind of performance from a no name replacement but not from Shimano's official Ultegra level product. Very disappointed!