Tire Size Improvements

[whokilledthejams]

Originally Posted by ATaylorRacing

Those Weld wheels are great for the track but WAY to fragile for street use. I had some Kosei Racing rims that were street legal but all four had up to a tenth of an inch wobble after 2 years of babied street driving and lots of drag racing...never curbed. I say go to Diamond Racing Wheels then click on their ministock button. They have steel wheels that should be tough enough...various 13s & 15s and bolt patterns. Their 13x5.5 with 1 to 3 in of back space is only 10.5 lbs and cost is $75.50.

I apologize for threadjacking, but at least in my case, that's not an option. 14"s are the lower limit for modern small Toyotas (the Echo, xA, xZ, Prius, Yaris), so at that point, good lightweight alloys are a better choice.

I wish I could use 10# 13" steelies. That would be really sweet, actually.

[jonr]

Larger diameters (to raise gearing), light weight, high pressures and slicks are all good to some unknown extent.

Other than that, I can't find a clear pattern as to what gives significantly better mileage.