LOYAL TECHNOLOGY-PACKAGE 2Pcs MH-P03H7.7 Bike Bearing 30.15 * 41 * 7.7mm 45/45 1-1/8 Inch Bicycle Headset Repair Parts Ball Bearings K345H7.7 replace parts
- The hub is the central part of your bike's wheels (front and rear), which connects to the wheel's rim via the spokes and through which the axle is fitted, enabling the wheel to freely spin on two sets of bearings.
- Hubs Bearing Guide
- the cassette or sprocket which drives the rear wheel is attached to the rear hub, which on most bikes also features mechanism to allow you to coast or freewheel (exceptions being fixed-gear or ‘fixie' bikes and track bikes).