Upon a closer examination I found the rubber one is tensioned to the crank by a spring because the rubber is very pliable, good for repair sleeves since they are slightly bigger than the original crank diameter. The Teflon one is tensioned to the crank by the stiffness of the material not good for repair sleeves should have listened to the directions. Basically what happened was that the Teflon one went on so tight it spun with the crank instead of the crank spinning in it. SO….if you use a repair sleeve DO NOT USE TEFLON. I personally would say the Teflon is better just because of the nature of Teflon, but as I discovered it does not work in all cases. If you use the rubber one put a small film of non-curing silicone on it so it doesn’t start up dry.

Owner caption October 2005 · Photo 414 of 462