Chain size explanation (aka difference between #40 and 420)

No replies
Jacob
Offline
Joined: 01/02/2010
Points: 11

I have been looking for an explanation of the two different chain sizes, the two vs three digit, and found it.

Here it is:

Chain size is in inches, the three digit number used to discribe the chain size is based on the "rule of eights". The first digit is for chain pitch. This is the distance between the pins. The second and third digits combine for roller width, with a decimal point inserted between the second and third digits.

For example, a 420 chain has a pitch of 4/8" = 1/2" (12.70mm) and a roller width of 2.0/8" = 1/4" (6.35mm).
A 525 chain (the size my bike uses) has a pitch of 5/8" (15.88mm) and a roller width of 2.5/8" (7.94mm).
A 530 chain has a pitch of 5/8" (15.88mm) and a roller width of 3.0/8" (9.52mm).

Now I feel better that anyone searching for "Chain size explanation" (including me) can find it for posterity. Thanks VifV!

Reinventing the Automobile: Personal Urban Mobility for the 21st Century
Two Billion Cars: Driving Toward Sustainability
JOLT!: The Impending Dominance Of The Electric Car And Why America Must Take Charge
Bottled Lightning: Superbatteries, Electric Cars, and the New Lithium Economy Essential to understanding the economic importance of lithium batteries
Transportation in a Climate-Constrained World
Revenge of the Electric Car The electric car is not only back from the dead, it's inevitable



Who's new

  • deegee
  • Lucy12345
  • Ecomoto
  • edubindie
  • rockwood165
Customize This