StoreKeeper99Z28

I had 4:10 installed at CMS my M6 Z28 Camero and the Tire size was then 275x35x18 Ryan changed my computer to the new gears and current tire size.

I now put on New Rims and Tires today ( 255x45ZRX17)

My question is how much is my speedometer off since I went to the New Rim and Tire size?


Any input would be greatly appreciated

Thanks in advance

Bruce/StoreKeeper99Z28
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99Z28/M6/ Pro 5 and Lou's "Short Stick"/ AAP Custom Y Pipe 3"/ 4:10 Gears CMS/MMS Aggressor Cam 233/233/578/578/113 lsa/Mac Mid-Lenth Headers/Don lee Auto Ported Throttle Body and Ported LS6 Oil Pump/AAP 6.0L Heads/SLP Dual Cam Roller Chain/MMS Mike Morgan e-Tune,Dyno Tuning.

Dyno: Sept 9,2007

439 RWHP/398 Torque

camarojunky74

iTrader: (14)

not much at all, actually they may be about the same size rotational wise,

BigDaddyBry

iTrader: (15)

If they have your tires on tirerack.com, you can check the diameter under "Specs", see what the diff is.

Or, I just found this:
http://www.powerdog.com/tiresize.cgi

Edit: Oops, that didn't help much. Only gives specs.

BigDaddyBry

iTrader: (15)

My bad, that calculator works, here's the output data:

Spec Sidewall Radius Diameter Circumference Revolutions Speedometer Odometer Difference
275/35-18 3.8" 12.8" 25.6" 80.4" 788/mi 60MPH 10000mi N/A
255/45-17 4.5" 13.0" 26.0" 81.8" 775/mi 59MPH 9825mi 1.8%