In mountain biking, friction
is encountered on the bike in a few very important areas. These are the
wheel bearings, drivetrain, and brakes. The wheel bearings, if properly
maintained, should produce a very inefficient amount of friction and it
usually goes unnoticed. The drivetrain on a mountain bike consists of the
chain, gears, and shifting mechanisms, and it produces about an 1.5% energy
efficiency drop. This performance from the drivetrain can only be achieved
if the proper care is given to the different parts involved, and it is regularly
is lubricated. Finally we come to the biggest area of friction found on
the mountain bike, the brakes. In the case of brakes, friction is our friend,
and actually prevents accidents and deaths when riding in the mountains.
There are several types of brakes on the market for mountain bikes, but
they all have one purpose, and that is to slow the bike down using friction.