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Originally Posted by 1028_Machinist
Having a shifting transmission is deffinatly a helpfull and worthwile modification; especially when you don't even have to worry about shifting. The only problem that i can see that might go wrong is that if you hit something at full speed and the wheel speed sensor gets knocked off or is rendered unable to sense wheel speed, you would be stuck in the gear that the robot was in before the sensor was disabled. Especially if you were in 4th gear. That battery might not last much longer! 
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What do u mean by wheel speed sensor
which sensor is that?
Isn't it built into the motor?
off topic:
has anyone built that spacer for the single sprocket
if so where did u find a diagram and what matters to use