Tyre size ?

**Whoosha** · 24-02-2011, 02:56 PM

Is there a formula to work out what the best tyre size is to be able to cross the line at a particular amount of revs ?
Reason being I am about the purchase some new MTs on 15s and currently crossing at 6000 ish would like to drop it back to 5800 if possible ,Diff is 4.11s if that helps

Thanks in advance Whoosha

jcxr · 24-02-2011, 03:30 PM

There is calculators on the net somewhere, or just go 1" taller. You could also hot it up a tad, and be able to rev to 6500 !!!
Look up www.race-cars.net, thay have calculators

JG33RD · 24-02-2011, 05:41 PM

This one has what your after plus some other good ones.

http://www.tciauto.com/Pages/418/calculators.aspx

There are formulas in the Auto Math Handbook but I think the calculators are quicker and easier to use

xrglen · 24-02-2011, 08:34 PM

calculators are ok for a manual but not if you have an auto with stall. Its best to supply your MPH, ET, RPM, diff gears, weight etc and ask around at the drags but it will come down to your stall setup if you have one.. Cheers

Quadcams · 24-02-2011, 10:48 PM

Hey Woosha pm me your email addres and I can send you a speed calculator, works a treat for anything from working out gearing to tyre size,mph, revs etc etc.

Wade

JG33RD · 25-02-2011, 08:45 AM

Quote:

Originally Posted by xrglen

calculators are ok for a manual but not if you have an auto with stall. Its best to supply your MPH, ET, RPM, diff gears, weight etc and ask around at the drags but it will come down to your stall setup if you have one.. Cheers

Not sure if you looked xrglen, but the calculator link was for auto setup, I agree with your post but for a someone looking for quick help I think the calc is reliable.

Bruce

**Whoosha** · 25-02-2011, 07:18 PM

Thanks gang Im on it