1, rims: With the tyre assembly, supporting the wheel part of the tire.

2, spoke: with the axle hub implementation of the installation connection, supporting the wheel part of the rim.

3. Offset: The distance between the Rim center surface and the spokes mounting surface. There are positive offset, 0 offset, negative offset points.

4. Flange: To maintain and support the rim part of tyre direction.

5, Bead seat: Also known as the installation surface, contact with the tire ring, support to maintain the tire radius direction of the rim part.

6, Groove bottom: To facilitate the tyre installation and demolition, on the rim to leave a certain depth and width of the pits.

7. Valve hole: Install the hole of tyre valve mouth.