Chain pitch is a dimension used to select a proper chain for a motorcycle. The pitch and roller width between the inner plates needs to match the manufacturer's specifications for maximum chain efficiency.

### Chain Size Definition

Chain size is a three-digit number that expresses both pitch and roller width. The first digit is the chain pitch. The second and third digits are the roller width with a decimal point implied between the numbers. The chain size can be found in the owner's manual.

### Rule of Eights

Chain size uses the rule of eights. Both the pitch and roller width are divided by eight to get the dimensions in inches. A 430 chain size has a pitch of 4/8 inches and width of 3.0/8 inches.

### Chain Pitch Definition

Chain pitch is the distance between the centre of any two adjoining roller pins. This dimension insures a good fit between the chain and the sprocket teeth.