Tigers,
Why wonder what the effects are of changing transmission, rear end, and
tire sizes are, when it is so easy to find out almost everything you
wanted to know?
The TigersUnited.com website already has the answer from Bob Hokanson
(father of Mike).
http://www.tigersunited.com/techtips/HokansonGearSpeedXL/pt-HokansonGearSpeedXL.asp
Download the "Transmission Calculator.xls" Excel spread sheet, and the
free Excel Calculator, if you do not have one. Shows data for selectable
rear axle ratios, tire diameters, transmission gears, etc, already
preset to the most popular ones. You can change nearly all parameters,
including tire diameter.
In the case of the Sumitomo 215-50-13 discussed, the tire diameter is
21.26 inches (per the Tire Rack site), and results in a 4th (1:1)
transmission and a 2.88:1 rear axle (stock) speed on 22 mph/1000 rpm.
At 5000 rpm the road speed would be 22x5 = 110 mph.
You can get this information for any rpm, rear axle ratio, and
transmission gear with this tool.
Thank You, Mike!!!!
Steve
___
Steve Laifman
Editor - TigersUnited.com
Thomas Witt wrote:
> I have the Sumitomo 215-50-13" on my Datsun 510. This small height tire
> really affected the rear ratio. 1st gear was good to the crosswalk. I was
> hitting 3rd gear before I got through the intersection. 60 MPH was 4,000
> RPM. Thankfully the Z rears fit the 510. I went from 3.90 to 3.36 gears. It
> made all the difference.
>
> I'd say to factor everything in before using these tires on a Tiger. Then
> again, if you have a close ratio trans and getting off the line is of the
> highest order of importance.... .
> Tom
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