What does 4/8 and 5/8 mean for sprockets?

[LilahFitz]

Sprocket 4/8 and 5/8 refers to the pitch size of the sprocket. The larger the fraction, the greater the distance between teeth. 4/8 equals 1/2 inch, 5/8 equals 5/8 inch, and 6/8 equals 3/4 inch. 1 inch = 8 eighths of an inch, 1 inch = 25.4mm. The following are the functions of automotive tires: 1. Support the full weight of the vehicle: Automotive tires support the full weight of the vehicle, bear the load of the car, and transmit forces and moments in other directions. 2. Improve vehicle performance: Automotive tires transmit traction and braking torque to ensure good adhesion between the wheels and the road surface, thereby improving the vehicle's power, braking, and off-road capability; together with the vehicle suspension, they cushion the impact during driving and dampen the resulting vibrations. 3. Prevent early damage to vehicle components: Automotive tires prevent vehicle components from suffering severe vibrations and early damage, adapt to the high-speed performance of the vehicle, reduce driving noise, and ensure driving safety, handling stability, comfort, and fuel economy.