I havent posted here in awhile but Ive passed the old Dakota down to my son and he is looking for some tires.

Hes found a deal on some 17x9 rims and the guy thats selling them is trying to sell him a set of tires that are 245/65-17. I know the stock RT tires are 255/55-17. Are the 245s going to givethe same profile on the wheels as the stock RTs?

 

I dont know that I'd put that skinny of a tire on such a wide wheel, sidewall will be damn near straight. I's go for some 265's.

 

I talked to a few tire places here local that I trust and they advised the sidewall profile should be about the same between the two tires on that rim. And the 245 is actually rated for more weight capacity. Thinking it through, if the 245 is 10(mm?) less than the 255 in width but 10 higher than the 55 it should even out once on the rim.....? Sound reasonable? Maybe not since the actual width is not as wide therefore the sidewalls wouldnt drop stright down to the rim like the 255 but instead be splayed outward. I see where youre coming from Magnet.

I wish I could find someone running this size but a web search showed nothing.

 

the width is the section (sidewall) width, not tread width. 245 = 9.64 inches, 265 = 10.4 inches.

245 = 9.6" wide sidewall on a 9" wheel.......not really a good combination IMO. Makes the tire "stronger", but will ride firmer since there's no sidewall deflection to act like a spring.

 

If Im understanding you correctly, I dont agree. The 245 is the measurement in mm from the inner sidewall to the outter meaning the width across the tire. The 65 is the sidewall height itself. By this chart the sidewall on the 245 would be 3/4" higher and the tire width 4/10" thinner. I think that means I would only need to stretch another 4/10" across the rim from the 255. I really wish they had given you a rim width option on this chart. GOD MY HEAD HURTS!

 

We're saying the same thing different ways. The sidewall to sidewall is 9.6", the rim is 9"...IE the bead will easily be unseated because the sidewall is straight up and down (For arguments sake, 1/4" of sidewall deflection is vertical). I would not run it. But that's my opinion. I wouldn't run anything narrower than a 265 on a 9" wheel, 285 being preferred.

I asked a tire shop the other day about mounting some used 175-70-15's (6.88") on a 6" wheel to use as frontrunners, he said he's mount them but charge me extra because it's a PITA to mount a straight sidewall and he does something like that in a tire cage instead of on a machine.