right now i have a set of 18 inch by 7.5 inch wide rims and im running 225/40/18 tires. I need 2 new tires for the front and the rear tire are still brand new. I was thinking about putting the rear tires on the front and buying tires for the rear. I was wondering what is the widest tire i can put on my rims. also i want to stay with the 40 series tires. I was thinking 275/40/18 but im not sure

 

235's were slipping on my 7.5's already, what do you think 275's will do? and how the hell do you go from 225 to 275?

 

235/40s are pretty good for 7.5"

 

215 or 225 is good for that size. Cuz if you convert 225 to inches, it's 8.85", so i don't think it's good to have a tire that's too much wider than a rim.

 

you'll waste your money... the tire will just come off your rim while driving...

 

what do you mean slipping ? .. correct me if im wrong but when you put the tire on the wheel it seals ... please explain

this is a good question ... ive got a 17x7.5 and im pretty much set on the idea of a 235/45 for the rim ...

 

so 235/40/18 is the way to go?

 

that's what im using.

 

are your rims 7.5 wide?

 

The first post I have 225/45 on my 17s but im pretty sure 235 would be fine...any more and your asking for it....

 

For a 225/40 R18, the Tire & Rim Association mninimum recommended width is 7.5 inches. For a 235/40 R18, it is 8. With a higher profile tire (234/45 R18) it drops back to 7.5. Assuming they factor in a safety margin, I would not go above 235. I think the concern is unseating of the tire from the rim in cornering.

 

im going to buy 235/40/18