Ascari_2

I am about to pick up some winter rims/tires for the F and the package comes with 18 G-Spiders with 225/40s on the front and 255/40s on the back. I know the back diameter matches up to what is recommended, but the fronts end up being about an inch smaller than the OEM size. So the question is, would it be s problem to have a smaller diameter tire on the front? Or will I be ok. Another question is would this throw off the odometer or speedo reading, or are those calculated off the rear wheels.

Thanks

MisterSkiz

iTrader: (2)

not sure..but your overall diameter will be smaller..might look goofy in wheel well...my g spyders have 225 45 on the front.

lobuxracer

iTrader: (2)

Speed is calculated off the rear wheels only. I found this out when bedding in the rear brakes on jackstands.

Ascari_2

Thanks guys. Would that mean that the odo is also off the rears?

ISF77

From what I've seen 225/45 is the recommended size up front. What is the width of your rear wheel? 18x8? I'm looking for a winter set myself. Not sure how an 18x8 rim would fit a 255 sized tire and if it would be too stuffed..

lobuxracer

iTrader: (2)

255/40/18 and 255/35/19 are so close in diameter there's nothing to talk about.

Ascari_2

Lobux, the rears are perfect, so as long as the speedo and and odo are run off of the rear tires, I'll be ok. I just don't want an incorrect readin off the fronts since they would be about an inch smaller overall.

lobuxracer

iTrader: (2)

The VSC might not like the smaller fronts, but the speedo won't care at all.

ToothDoc

The VSC didn't care when I had 225 40 18s and 255 40 18s in the rear (1" difference in tires). Eventually, I wore out my old IS350 front tires and went up to the right sizes. The thing that bothered me was the wheel gap was fugly.

lobuxracer

iTrader: (2)

Ah - I missed what you were getting to - the odometer and speedometer use the same signal source, so if the speedo works correctly, the odometer will also work correctly.