Hi yall,

Is there a chart somewhere which tells me how wide a rim has to be to fit a certain width tire?

For example what's the widest tires I can fit on an 18"x9" rim? I am thinking I should have ordered 10" rims for the back of my 07, and now I would like to see what limitations I have in choosing a tire size now.

As a side note I was just able to fit 275s on my 2002's stock 17" rims - they made a little shiny spot inside the front wwell, but thats all.

thanks,
-howy

2007 MGTvert Manual stock 250mi
2002 MGTvert Manual stock 92kmi
1999 Durango stock 60kmi

 

This calculator should help, it gives recommended Rim widths for the tire size you specify.

Tire Calculator

 

Not liking the looks of this.. [:'(]

I just dumped some cash on 17" GT take offs (alloy) and got my Nitto 555s today (255/45/17), and that calculator is telling me that the diameter difference is too high (4.2%) Is this a good time to panic? [&:]

 

If I got 275's on my stock 2002 GT's 17" rims I would think you should be fine, but I dont recal the width of my stock rims - I thought it was 8" or 8.5".
-howy

 

That makes me feel better, but I guess I'll find out tomorrow.

 

You will have NO issues at all with installing the 255/45 tires on stock wheels! See pics; Our car with 255/45/17 & stock suspension,

again stock suspension w 255/45/17,

Now lowered an inch and a half with 255/45/17,

The stock 235/55/17 vs 255/35/20 and 285/30/20 (I installed after the lowering strut and spring kit) If you go this wide you'll need wider rimes!

I don't have pic of them on the car yet! But compare the width to the stock 235/55 Pirelli!

05SDI

 

Looks good! Thanks!

I already put a bid on some 18" fanblades with stock pirelli's.. definitely want to get up to AT LEAST 275 in the rear. Wider is better!

 

The general rule is this. The Tire should be no more than 4" wider that the rims width. In other words if you have a 20x10 wheel you would not want to put a tire on that was wider than 14" in width. So for a 17x8.5 you can go to a 12.5" wide tire


Richard

 

On the 17x8 wheels that come on the mustang you can go up to a 275 width, however, you may have to recalibrate the speedo.

 

275/40-17 is the perfect tire for our 17x8 rims...ok not mathematically perfect, but perfect look and maximum width in back at least, and no issues whatsoever