How big are your boots? Many of us like to wear those big chunky biker boots. They are tough comfortable, and they fit our ideas of what a boot should look like. Unfortunately they have the down side of being a bit numb. Like others I have found my feet resting against shifters, pipes, etc. most of the time it is not an issue, but enough time with my big, dumb, numb feet putting pressure against a shifter, and all sorts of bad things can happen. In these pix we have a shift fork that is completely straight, and has wear notches on both sides. The contact portion of the gear it rides in; has also been beveled from constant contact. The gear rides on a needle bearing incased in a plastic sleeve. While ordinarily a long lasting and durable design. The excess load and heat caused the plastic to exit the area, and the needles to roll on top of each other. Allowing the gear to tip away from its mate under load. The symptom that this bike exhibited. Were fairly typical of this type of failure. In second gear. Right in the fat part of the torque curve. It would jump in and out of 2nd gear. The jump would happen so quick. It felt more like an electrical shut down. I have seen this type of failure on highly modded fat tire bikes, but never with the fork wear. This leads me to believe I am dealing with 2 separate causes for the same type of failure. One being strictly torque load, and the other being the big old foot
Posted on: Mon, 11 Aug 2014 21:09:07 +0000
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