tire width to rim width links/info?
 

Hey all, I remember seeing a link a while back (like 4 months ago) to a site that had how wide of a tire you could run safely to a given tire size. Would anyone happen to have a copy of that link anywhere?

I also had a pretty big pamphlet from Toyo that had this information as well, but can't seem to find it after unpacking all of my motorsports catalogues and stuff. I appreciate any help anyone can link :)

Or to make it more simple, what is the widest tire size that can fit on an 18x9? I was doing many calculations, and came up with a 265/30/18 being the safest possible tire to run on the rim. Let me know if that's too wide for a 9 inch, 35mm offset rim. That's for the fronts, and I have 25mm wider fenders up front, and the car is dropped on Zeal Function X coilovers. They have a 2.5'' spring iirc, so clearance shouldn't be too much of an issue.

FWIW i'm running 295/30/18 in the rear on a 10.5'' rim, and am trying to get the fronts to match up, because the car plows like a sled :( . . . . I think I may drop down to a 275 in the rear tho, to reduce the understeer when pared to the 265, if 265 is the widest I can run on a 9'' rim.

Thanks in advance for the help!
Chris-

Try hit any of the manufacturer sites.
I did this recently, and Yokohama, Bridgestone, Pirelli, and Michelin had them all online on some chart - some are PDF.


-Ted

Awesome, man thanks Ted! Many thanks!

For anyone searching for this info:

http://www.bridgestonetire.com/tires...sproductid=227

Bridgestone has data sheets for each tire model.
This is the one for the S03 Pole Positions:
http://www.bridgestonetire.com/tires...sproductid=227

Same with Michelin...
This is for the Pilot Sports:
http://michelinman.com/assets/pdfs/doc_pilotsport.pdf

Same with Yokohama...
This is for their Advan AD07 Neova:
http://www.yokohamatire.com/pdf/ADVANNeovaBulletin.pdf

Same with Pirelli...
This is for their PZero Corsa Assimmertrico:
http://www.us.pirelli.com/en_US/tyre...roductid=17428

You just gotta poke around for this kinda info. :)


-Ted

This info is also available frome the Tire Rack web site.

I checked all over the tire rack site, but couldn't find anything on there in regards to appro. rim width vs tire widths. Please do link if you have it. I have already found the info I needed, but just in case anyone else needs it it will all be in one thread :)

The appropriate tire width for a given wheel width depends on the given tire model itself. Go to Tirerack, pick a tire you like, and then click on 'specs'. Almost every tire has a wheel width range listed under specs, with a few they've just left out for whatever reason.

Usually, a given tire size will have the same approved wheel width range manufacturer to manufacturer, but NOT ALWAYS. Why? Because a 255/35/18 (just an example) from one manufacturer could be significantly wider or narrower then from another. This is true sometimes even from one model line to another, within the same manufacturer.

Tire size rating is a guideline - not some hard and fast measurement.

That why they use the term "nominal width".
I'd trust tire width to rim width recommendations from the TIRE MANUFACTURER.
This is why I recommend checking the manufacturer data first.


-Ted

You'll find that a 265 on a 9" wheel is fine. And theres other ways to correct for understeer other then changing tire width stagger. Add more negative camber to the fronts, add more toe out up front, set the rears with less negative camber and less toe (0 toe). Then theres always spring and damper rates to play with along with sway bar settings.

~Mike...........

tire width to rim width links/info?
 

Can you mount a tire on a rim? With enough force, you would be amazed at the wide range of tires that can be mounted on a given rim.

"Can I get the tire on the rim" is a very a different question than "what is the best width of tire" for a given rim. One "sizing" problem is that most tires sold in the USA are mismarked. Tires marked as a 25mm width usually measure closer to a 23mm width. Tires marked 23mm in width usually measure about 21mm or 22 mm in width.

So, you need to carefully measure the tire in question when it is fully inflated to maximum PSI to find out its true width. Its true width is most likely 1mm or 2mm less than what is marked on the sidewall. Then, you need to measure the interior distance from the left wall of the rim to the right wall of the rim. Make your decision based on TRUE measurements, not the advertised measurement.

If you are uncertain about the match between a given tire and a given rim, look at the information provided on the company website by the folks who made the rim.

If a given rim is designed for tires that are a TRUE 25mm in width, tires that measure between a "real" 23mm and a "real" 28mm should fit well. But, if a rim is designed for a 25mm tire, a tire that is a "real" 21mm will not be an ideal fit, and the tire will not meet its optimum cornering and handling performance. The fact that you can mount a 21mm tire on that rim does not mean doing so is a a great idea.