Thread: What tire size do you run on 18" wheels?

Kinda confused...

I'm looking for 18" wheels for a 2006 GP.

Tirerack recommend 235/50-18 for either a 7.5" or a 8" rim.
Superbuytires recommend 235/40-18 for a 7.5" rim.

Both tire sizes I don't like.

Can I do a 245/45-18 on a 7.5" or 8" rim?

If you go with 18", what tire size do you drive?

I'm running 225/45 on front and 245/40 in back with no issue on 18"x8"

Thanks so far Guys :-)

i run 245/45 on a 18x8.5 rim with a 35 offset

245/45/18 on 18 x 8 wheel

Originally Posted by NegativeOne13

I'm running 225/45 on front and 245/40 in back with no issue on 18"x8"

Why? 225/40/18 is only 25.1" tall and 245/40/18 is only 25.7" tall. Stock is about 26.7" Your speedo is WAY off.

if you want to slam your car like a boss you run 215/40/18.

I'm running 245/45-18 as well, which is perfect in my opinion.

255/45/fatties here

245/45/18 is the only size you should run on an 18" tire unless you have a gxp. Not gxp rims but the actual gxp itself.

Stock wheels rotate 758.2 times per mile.

245/45/18 757.1

235/50/18 739.6

235/40/18 794.6

Big difference on the sizes. Just based on that you should know what to use. Hope this helps everyone when deciding what size tire to use.

you want to stay within 3% of the stock overall diameter to not throw off your speedo.

245/45 the correct size.

I run 245/40s on my GTP since im slammed like a boss.. hahha

Originally Posted by codyAK

I'm running 245/45-18 as well, which is perfect in my opinion.

That's what I think.

Thanks for all comments

I found a 18 rim with 255/40 tires. To small? Will it make the speedo to far off? I didn't see anyone mention that size? How will the ride change compared to the 16 stock tires

those should be fine. they are wider than we normally recommend, so the 40 series probably evens it out for the most part. cant get to any tire size calculators at work...

2.2% is a lot when it comes to tires. You should keep it within .3%

255/40/18 comes out to 26.03" diameter which is .7" too short. Run the correct size and be done with it.

2.2% is nothing. 3% is what you want to stay within. 0.3% is nearly imperceptible.