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Running in the highest gear for the least torque is the best for slippery wet roads. The rear tire would spin out easily in 2nd or 3rd with not enough traction because it is wet. The awesome power isn't good in the rain.

I thought it was stuck in second gear for the past month...

These bikes can do 100mph in 1st gear. Selecting a gear is about how hard of a pull do you want. You want the least pull with no traction in the rain so highest gear is the best.