Quote:
Originally Posted by AdamHeard
For 1:1 ratios, the math becomes dead simple. For Chain, the c-c must be a multiple of the chain pitch (.25 for #25, .375 for #35). It can be a multiple of the half pitch if you're willing to use a half link.
For belt, it must be a multiple of the half pitch (BUT don't assume all belts are sold!). Required toothcount on the belt (B) is;
B = T + 2*C-C/P
T = Pulley toothcount
C-C = Center to center (in same units as P!!!)
P = Pitch (in same units as C-C).
For both chain and belt there are arguments for adding a fudge factor to the c-c. I generally don't for shorter distances, but will more commonly do so for longer distances (or for small pitch belts).
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If you have multiple sizes or want to save time, you can just use a chain length calculator:
https://www.rbracing-rsr.com/chainlength.html