Rim width range vs measured rim width

[wrcsixeight]

My Door Placard tire size is p235 75 15XL on 15 x 6.5 inch rims.

Just today I had DT order me some Kumho SAT kl61's in the 30 x 9.5 x 15 size and they beat Tirerack's delivered price by a few cents.

While the 235's have a measured rim width of 6.5 and a range from 6 to 8, the 30 x 9.5's have a measured rim width of 7.5 and a range of 6.5 to 8.5.

Any downsides to being on the lower end of the rim width range?

 

[CapriRacer]

The idea behind the allowable rim width range is to keep you within the range where problems would be minimal.

 

[Hokiefyd]

Originally Posted By: wrcsixeight
Any downsides to being on the lower end of the rim width range?


No. In fact, I had 30x9.5R15s on my Nissan truck, which had 15x6" wheels. No problems at all. You may have to run a slightly lower air pressure to keep wear even across the tread. You'd have to discover this through trial and error though.

 

[wrcsixeight]

Okay, Thanks for the input. I've been pretty abusive to my current 8 year old Michelins with over 70 k miles on them but they still have significant tread life, so this is either a sign that my on road manners are not as abusive as I imagine, or the outstanding tread life of michys.

Wish they still made the XCX-APT for Sears, I would of gotten it again.

 

[Rand]

you may have minor wear issues thats about it..

ie center wearing faster

its definitely better to be on the low extreme than the high extreme for acceptable rim width

 

[CharBaby]

I used to have a calculation(that I found in a magazine) for measuring the rim width and how wide of a tire can go on a particular width of the rim. I don't know if I said that right!

Of course, this all depends on if the tire will fit in the wheelwell and not hit any other suspension part/struts etc.

I'd like to find this calculation again, not for myself but, to post it here for others to use. This article also mentions about wheel offset and proper measuring to fit larger tires on you vehicle.

I'm sure that someone here has something similar to what I am talking about. The calculation is similar to figuring out the diameter of a tire in the...+1/+2 concept.

 

[wrcsixeight]

Well, I got the tires installed today. The ride is so much smoother over bumps and reflectors that I checked the PSI when I got back. I used to keep 42 and 44 psi f/r on the michys. They put 45 and 50 psi in these, so I'm thinking the Tire rack survey was accurate in placing the SAT KL61's at the top of road comfort category of AT tires.