Anyone running smaller tyres on the back?

[Joe L]

just been watching

http://uk.youtube.com/watch?v=uE67br3xJOA&feature=related

and these guys all run smaller tyres out back

e.g the Spoon Civic EK9
F 255/40R17
B 215/45R17

and on a Honda Fit
F 225/45R16
B 195/55R15

anyone doing the same thing? I imagine it would help prevent understeer, why run the same size tyres anyway?

 

[Jungle_Jim]

isnt is a case of running wide wheels on the front rather that smaller ones on the back, just to get the power down on heavily tuned front wheel drive cars

 

[Joe L]

Quite possibly, but the torque from a K20a isn't exactly huge about 180 lbs-ft?
Its probably more due to braking load over the front being much greater.

I think having higher side-walls out back would create more lateral grip as they would distort more before giving up. Having smaller out front would improve initial turn in response or bite.

It confuses me how R15s are used on track clios, while the S1600 use R17s
Ktecs car uses 15's on track and 17's on the road;

www.k-tecracing.com/show_demo_car.asp?id=1&pic=2

I'm just wandering what would be ideal or clios,perhaps;

F 205/45/R15 = 565mm Di
R 185/50/R15 = 566mm Di