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!

Taking Charge: The Electric Automobile in America
Build Your Own Electric Vehicle You need this book if you want to build your own EV
This is what the END of Gasoline looks like - bumper sticker
Car-Free Los Angeles and Southern California
How to Live Well Without Owning a Car Save Money, Breathe Easier, and Get More Mileage Out of Life
Resilient Cities: Responding to Peak Oil and Climate Change



Who's new

  • Trabant 601E
  • aboudie19
  • Myus
  • vikram_ram
  • শোভন শ্যাম শ্যাম
Customize This