[Ivory15Cat]

Hey all,
So I have been trying to run the math on an upper and lower change to figure out what size belt to get. I have been struggling. Could use someone who is a bit smarter with this to help a brother out. The combo is a 2.95 upper and a 9%od lower. From what I can find Gates doesn’t make anything in the size I need. My math says 58.69” effective length. Is this right? Thanks ahead of time

 

[Rockster]

Have no formula to offer.

Best I can offer is use a heavy string in place of the belt to come up with the total distance the belt will have traverse. With the string you won't be able to put any force on the tensioner. It will be fully extended. So the length you come up with be too long. A WAG is an inch shorter than the string might be ok. But you might end up having to try 2 (or more) belts before you find the right one.

Another thought. Any chance the company that offers the 2.95" upper pulley and OD lower pullley provide any recommendation for a correct belt to use?

 

[Ivory15Cat]

The formula I got from Gates was:
Current Pulley - New Pully = Difference
(Difference x 3.14(pie)) \ 2 = distance difference in belt length

 

[GreenMachine15]

There is a prior post with this info, I used it a couple years ago. Use the search.
I would guess a 594 belt.

 

[Ivory15Cat]

Green do you have the link for it

 

[GreenMachine15]

The great pulley/belt size thread

Hello, Like many of you I often struggle with choosing the correct belt size to go with my pulley setup. I only have a few that I know work, but through the cooperation of people like you I would like to make this the end all be all go to thread to choose your correct belt size for your setup...

www.hellcat.org

 

[Rockster]

The formula I got from Gates was:
Current Pulley - New Pully = Difference
(Difference x 3.14(pie)) \ 2 = distance difference in belt length

That's a cool formula.