different sized wheels

[Big G]

does anyone know the legalities on running smaller wheels on the front of your road car than the back.

I know Lotus Elise's and many other cars come from the factory with smaller front wheels...

I only ask because I'm running standard mk4 golf wheels 15" on the front and my RS4 18" wheels on the back until tomorrow when I get new tyres on my 18's

[bodgit]

http://www.kwik-fit.com/change-wheels-size.asp
maybe just the last paragraph recalibrate your speeedo

[Big G]

The rolling diameter is the same I'm sure. it just understeers a bit hehe

Now I'm back on the original wheels on the front and the electronic speed sign outside the school still reads within 1mph of my speed.

[bigred5765]

there is no legality here, the drive wheels must be bigger than the steering wheels.but unsure how that goes on front wheel drive car,you cant run different sized tires rims on the same axle apart from a super saver spur tyre, and to a limited speed.

[Big G]

that's what I thought. as long as they are the same left to right it doesn't matter front to back

[bigred5765]

bigger wheel is supposed to be on the back,i was in the tire trade for a while and it use to say drive wheel should always be bigger than steering wheel,but god knows how that works on front wheel drive.