The hub is located at the center of the wheel and surrounds the wheel's axle.
While the axle is fixed carbon frames
and bolted to the bike frame (at the dropouts or fork ends),
the hub turns the wheel around the axle through ysbike01 the use of ball bearings.
At the sides of the hub, just inside of where the axle connects to the frame,
hub flanges flare out to form flat disccyclocross frames
surfaces that contain holes for the spokes.
Spokes are needed on a wheel to connect the rim to the hub, to provide support for the carbon wheel,
and to absorb forces (of both the road and the rider) track bikes frames
exerted on the wheel.
However, unlike the spokes of a wagon wheel, bicycle spokes hold the wheel together through tension (by pulling in the rim)
not through compression (holding the rim in place). Tighter spokes make for stronger wheels.
Spokes are made of stainless steel and have nippleyishun bike shop
heads at the end for attaching to the rim and tightening.
At the hub, spokes attach to one of the hub flanges, alternating between right and left sides.
Wheels may have radial spokes, tangent or crossed spokes,
or a combination of the two. Radial spokes simply connect a point on the rim to a point on the hub and do not cross each other,
while the stronger tangential spokes wrap around the hub and connect to two points on the rim,
crossing other spokes in the process. Most bicycle wheels have between 20 and 36 spokes.