The rim of a common bicycle has 4 materials, namely:

1. Iron rims have advantages and low prices. Disadvantages are heavy and easy to rust.

2. The steel rim has the advantages of high strength, impact resistance and low price. Disadvantages are heavy and easy to rust.

3. The aluminum alloy rim has the advantages of light weight, moderate price, and oxidation resistance. The strength of the shortcomings is low.

4. The carbon fiber rim has the advantages of light weight and good elasticity. Disadvantages: low intensity and high price.