In the bearings that go between the stationary part - the axle, and the rotating part - the hub.
Any bicycle part that makes contact with another part but needs to move to function must have friction reduced. The wheels bearings, steering head, pedal bearings in both the hub and pedal, and the chain links all are designed for minimum friction but they also need lubricant.
Yes, because it contains finely machined bearings designed for the explicit purpose of spinning easily.
It is a hub.
A brake in which the friction is caused by a set of pads that press against a rotating disk.Disc brakes on a bicycle are brakes that slow the bike by acting on a disk that is mounted on the hub of the weel. This is different from standard brakes.
A brake in which the friction is caused by a set of pads that press against a rotating disk.Disc brakes on a bicycle are brakes that slow the bike by acting on a disk that is mounted on the hub of the weel. This is different from standard brakes.
A bike hub is mainly turned on a lathe. Spoke holes are drilled and if it's a hub brake or a rear hub there may be some milling too.
http://forums.mtbr.com/showthread.php?t=283367
on the rear wheel, at the hub. it's the bit that the chain runs over.
polyp
In general rolling friction is any friction specifically related to the rolling motion. The friction on the axle to hub bearing, the tire flexing, the tire tread on the surface of the road and so on.
Usually by having a special rear hub which measures the output of the rider.
polyp