Bottom Bracket Tool BBT-9
BBT-9 possible design problem
Poster le 2007-10-06 par BBT-9 BB Tool dumfries. va
BBT-9 is a rare exception to Park Tools record of exceptional bike tools.The BBT-9 is actually two functionally distinct parts. The part i feel has the problem is the one that engages the 8 internal splines of the crank arm adjustment cap. The problems are:
used to install. adjust. remove the crank arm adjustment cap.
1- The plastic material used for the working tip of part sheers of very easily in normal course of loosening the cap.
2- The location/mounting design does not permit a good grip when using the part to loosen the cap (unscrew). Often momentary moderate pressure is needed to start release in turning off the cap. The low leverage afforded by the part causes user to press the tool unevenly and imprecisely. resulting in breaking down the shoulder on the spline part ot tool.
NOTE: The Shimano design of the cap itself also contributes to this problem. as the female part the wrench engages is too shallow for the tool end to get a good purchase to grip the cap.