harbor freight 79cc ?!?

[scotto-]

T / Pi * pitch = D

Example: I have a 75T #35 sprocket. 75 divided by 3.14 times 0.375 = 8.957 inches.

Example 2: I have a 51T #41 sprocket. 51 / 3.14 * 0.5 = 8.12 inches

Geez Aleman, very good! You should be a math teacher.

 

[The_Aleman]

Geez Aleman, very good! You should be a math teacher.

Heh, nah. My figures aint perfect, the actual diameter is a little more than that.

Those figures are the diameter at the center of where the chain's link pin will be. The formula works to figure a rough diameter tho.