I've put the summer rubber back on the car and was hoping someone could confirm what I have for the calculations? Tire is a 235/45/17(new one) Stock size was 225/50/16
Attachment 11581
Paul
"Just in case some of you that think accuracy in tire caliration does not matter. If there is a 15% difference between rear wheel speed and front wheel speed (or even side to side on the front) the abs will throw a code. Big deal you say, 15% is a lot, well not really, that is only .7 of an inch diameter difference on a passenger rated tire (read as soft side wall). If your abs lamp is kicking on while your cruise around at 50 to 60 kmh for say 3 minutes then you probably have a tire sizing issue. If one were to actually take the time and measure a stock tire on vehicle, then calculate that same tires size and additionally compare it to the calibrated tire size you will find a substantial trend toward the calibrated tire size being smaller than the calculated size.
Get out your measuring tape and measure from the exact centre of your axle to the floor, thats your real radius, now double it-thats your measured diameter, now calculate the the diameter from the tire size on the side wall, now average the two numbers and you will most likely have a number that matches the calibrated number."*--copied this from another post--*
Is this the right way to go?