Wheel and Tyre calculator

[aka_juffa]

Very handy calculator. It allows you to see the affect of changing wheel/tyre size on your actual speed v speedo reading, and provides information on how much closer/further the outside edge of the tyre will be from the inside of the wheel guard/fender when compared to your current wheel/tyre combination....very handy when upsizing your wheels/tyres

http://www.rimsntires.com/specs.jsp

J.

[hks_kansei]

Tyre section width = T
Tyre aspect/profile = A
Wheel Diameter = D
Wheel Width = W
Wheel Offset = O

Rolling diameter = (D*25.4)+((T*(A/100))*2)

Wheel inner barrel = ((W*25.4)/2)+O
Wheel Outer Barrel = ((W*25.4)/2)-O
If new wheel Inner barrel > OEM wheel, new wheel closer to guard liner/suspension
If new wheel Outer barrel > OEM wheel, new wheel closer to outer guard.


Track change = oldO - newO



Formulas for those who may want to just plug it into excel to compare bulk wheels/tyres/etc.
note: I haven't had a chance to double check my formulas yet, but they should be fine.

[Jace]

mr mathamagician up here ^

i like this one because it gives a rough idea of tire stretch/bulge and i think it's a bit clearer as well

http://www.willtheyfit.com/