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shaft drive front of motorcycle output shaft ball bearings 90 ninety degrees drive shaft next to swingarm or inside swingarm driveshaft pinion gear ring gear bevel gear side view view from top view from rear why are they called 90 ninety degree gearsets bevel gears the rotating shafts are at a 90 ninety degree angle effectively redirecting the power transfer 90 ninety degrees there are always a set of two gears to transfer the power hence gearsets