Re: 304/290/200R4 - now V8 Fuel Mileage

[Tom Jennings <tomj@xxxxxxx>]

On Sat, 14 May 2005, Ken Ames wrote:

> 215 or 225/60 is what you're looking for for 60s to compare with the 205/70s.
> math indicates  220.77/60.

Just FYI, it's easy to actually *calculate* tire diameter, using
only the size marked on the tire. I forget where I found the
formula, on www somewhere, but I put it in my engine
RPM/transmission/axle/tire spreadsheet, and now I can plug any
combo of parts together in seconds. I've got a "tab" sheet for
every car and project combos.

If anyone's interested I'll post it.