Important Mathematical Formulas [Archive]

Don juan futon

10-24-2004, 08:32 PM

Incase anyone is of interest, I thought I'd post these up for you. Might help you in figuring out your own scenario versus having to ask someone else.

Rpm=Rpm x Gear Ratio x 336/tire dia.

Gear ratio=rpm x tire dia./mph x 336

Tire dia=mph x gear ratio x 336/rpm

Effective ratio=(old tire dia./new tire dia.) x gear ratio

Equivalent ratio=(new tire dia./old tire dia.) x gear ratio

MPH=(rpm x tire dia.)/(gear ratio x 336)

Feedman

10-24-2004, 08:41 PM

Incase anyone is of interest, I thought I'd post these up for you. Might help you in figuring out your own scenario versus having to ask someone else.

Rpm=Rpm x Gear Ratio x 336/tire dia.

Gear ratio=rpm x tire dia./mph x 336

Tire dia=mph x gear ratio x 336/rpm

Effective ratio=(old tire dia./new tire dia.) x gear ratio

Equivalent ratio=(new tire dia./old tire dia.) x gear ratio

MPH=(rpm x tire dia.)/(gear ratio x 336)

Very good info....there is also a sticky @ the top of this page that helps with Gear Ratios...its in Excel format.... 8)

Don juan futon

10-24-2004, 09:13 PM

Yeah, that's why I thought I'd add a couple extra. If you're really looking to gain .1's of a second then these are quite vital.