Are you talking about the RPMs in which the transmission is going to shift being high?

 

Yes ?

 

Those are fine. Remember it's only to be shifting at those RPMs at WOT.

 

Is there a chart to determine the tire circumferance ?

 

Y'know, you really should start using Search (and Google) for some self-help. A little common courtesy wouldn't hurt either...lol

This is a C&P right out of the Evo 2400 manual ( no formatting - it was a Word doc).

While a chart is okay, your most accurate method is direct measurement - as I bolded below...

The following table will help you determine your tire circumference by matching your tire size with the common sizes listed. For example, if your tire size is 285/ 65-18, the value (circumference) you enter into the Evolution is 2600. You may also use the formula provided to determine your approximate tire circumference. Finally, you may also measure your tire’s circumference by marking your tire and rolling it one complete revolution and measuring the distance in inches or millimeters. If you measure in inches, multiply the distance by 25.4 to convert to mm. (ex. 91.3 inches x 25.4 = 2319 mm). The range of change is from 2000mm to 3500mm in increments of 1mm.

Width Ratio Rim Circumference Tire Size
265 70 16 2441mm 33 2632mm
275 70 16 2485mm 35 2792mm
305 70 16 2617mm 37 2951mm
215 75 16 2289mm 38 3031mm
245 75 16 2430mm
265 75 16 2524mm Circumference Equation:
285 75 16 2618mm [(width * ratio * 0.02) + (rim * 25.4)] * 3.1415
295 75 16 2666mm Steps:
305 75 16 2713mm 1. Multiply Width, Ratio and 0.02
315 75 16 2760mm 2. Multiply Rim and 25.4
325 75 16 2807mm 3. Add Step #1 with Step #2
265 70 17 2521mm 4. Multiply Step #3 with 3.1416
285 75 17 2698mm 5. The result will be the circumference of your tire in mm.
315 75 17 2840mm
275 65 18 2559mm
285 65 18 2600mm
285 60 18 2510mm
325 60 18 2660mm

 

Common courtesy ? Did I say something wrong ? Thanks for your help

 

Hey, give this a try for tire sizing.

http://www.miata.net/garage/tirecalc.html

CJ

 

02Crew, I couldn't get your link to work, but thanks

 

Fek charts - just go measure. You'll see how far off the charts, or the manufacturer's numbers, can be ...

BTW - here.. this one workks lol

http://www.net-comber.com/tirecalc.html