Why does speed sensor gear keep breaking?

[JollyGQ]

Originally Posted by tovar

Your problem may not be sensor in wheel but rather between sensor and fork leg, that bump/stop on fork leg does not fit in grove on sensor (as it may appear). Sensor has to go behind bump.

Yes, I am aware of the fake mounting tab...lol. It bugs me every time I see it because it just seems like it should be set up better.

Originally Posted by TeeRiver

The glue might not be holding up. If the broken tab fails again, the remaining good tabs will take extra load. Or, once the old tab comes off, fragments might foul the remaining good ones. Maybe residual glue from a prior repair is causing breakage? Just guessing here...

Perhaps try starting over with a brand new rotor, make sure there is no residual glue anywhere, grease it up well, then try again.

Yeah, that's a good suggestion. After they replaced it, I broke of one the first time I took the wheel off...I was using an actual stem stand instead of my wooden slider stands and the wheel dropped before I was ready and one tooth broke off from the sensor. I glued it back with JB Weld. Then the next time it was two broken...and now this time it's all four.

Originally Posted by Rock Dodger

The part that I grease is the seal, not any of the internals.

IIRC, the seal of the speedo drive housing is static, ie doesn't turn, it rides against the inside of the rim hub, which does turn. Since it's rubber against rotating aluminum, it should get some grease to lubricate it and to seal out water. Same thing applies to axle seals.

Great info! Thanks! It never occurred to me to grease the sensor seal.