Okay, I did a bit of searching trying to figure out why my speed sensor gear keeps breaking. I found a lot of references to them being broken and how to replace (very cool, cuz now I know I can buy just the gear), but haven't found any comments on WHY the darn thing breaks ALL THE TIME. Every time I take it off, there's another tooth broken. I glue it back on and put it back together and the next time it's the same tooth and another...lol. This last time, it was all four teeth broken off...not worn down, but broken off at the hub. Is there too much slack between teeth that causes them to slap against teeth on wheel and break? I'm tempted to buy a new gear and find out...maybe put something in to keep it snug?