I also liked the engine's tractability, which allowed it to pull cleanly at speeds as low as 20 kmph in fourth gear. While riding, I noticed a slight vibration on the footpegs and handlebar ...

Bevel gearing is another way of dealing with intersecting gear shafts. For bevel gears, the teeth centers lie on the surface of an imaginary cone, which is the "pitch cone" of the bevel gear. Two ...