beefystud

whats the widest tire you can fit on 18x9.5 rim ?

Manga_Spawn

255/35/18 is the widest I would recommend. For wider you really need a wide wheel. You should also try searching and providing more details before posting these very generic questions.

RedCelica

We really need more info from you to determine the best answer. What are your goals?

ZDan

I run 275/35-18 NT01s on 18x9.5 wheels at the back of my FD for street and track. It is a perfectly cromulent fitment...

275/30-18 would have the correct diameter. Technically you could run 285/30-18 on 18x9.5, that would be the widest...

RedCelica

Im sure you can stuff a 295/30/18 (Advan A052s for example) on then...but you're not considering sidewall geometry, fender clearances, and it will probably hurt the cornering performance. But hey...if you're building a drag car, go nuts.

Mike RT4

265 is considered the optimum for 9½" rims for most manufacturers tyres, however chose manufacturer in this size (265/35 x 18) and see what they specify as the optimum .

s2000Junky

"optimum" would be matching the tires section width to the rim width so no that wouldn't be necessarily true. I've never seen a manufacture list the optimum rim width to their tire spec, its rather always seems to be right in the middle of the range. For example, 255/40/17 with a typical section width of 10.3" would be a 10" wide wheel max. However the min to max is listed with a 8.5 to 10" with the tires measurement based on somewhere in the median width wheel such as a 9" - which is what a 9.5" to 265 paring would be.

Check the tire manufactures spec on the tire, and size the wheel to that and hope the tire spec is accurate. I do find some discrepancies sometimes.

RedCelica

I'm gathering from a few other of the OP's posts that he is not concerned with optimum, but extreme maximum (for reasons he's not divulging)...so I'd say 295/30/18 is the gross limit.

s2000Junky

And the sidewall being pinched so far that it ends up being a 265 worth of rubber on the ground at any one time anyway, with the compounded effects of shitty handling.

When I was running a 295/35/17 on this car it was mounted on a 11.5" wide wheel, and it had just the right amount of pre load on the sidewall.

beefystud

no , i care , i want optimum....