The Stovebolt Site Forums The Shop Area General Truck Talk how big can I go????

What is the largest size tire I should run on my 5.5x15 rims? 235/75/15 ..or something smaller like 215/75/15. I don't want something that looks too fat on the rim, and I understand that a bigger tires doesn't actually mean better handling. Just thought I would kick around what everyone is running.

I try and keep the side walls vertical. That is the tread width no greater than the rim width. Cuts down on the side to side movement of the rim in the tire. The movement is probably no that notice in our trucks, but it was accepted practice in the rally group I belonged to many years ago.

Larry

I have to check on the exact size.. but I have 285/60 or 50/15s on my '63 fleetside. They fit, but I can't put alot of weight in the box for fear of the inside of the fender cutting the sidewall. My fenders are kinda ratty inside, with a bit of cleaning up the tires probably would just fit past the inner edge.

Be careful going to too wide a tire for the rim. You can split a rim when loading the truck. Don't ask how I know this.
Cleon

are you sure those are factory 5.5" wide rim? sure sounds like a big tire if they are

He is trying to wrap his factory 5.5" wide rims. He is not asking how wide a tire will fit under the wheel well without rubbing.

Tony Smith

a 5.5" rim should support a 6.5-7" wide tire. Converting to metric that would be a 165 or 175. You may be able to go to 185 195 range. Beyond that it is recommended to go with a wider rim so you dont run into beading issues.

That sounds aweful small for tires on such a heavy vehicle. I was thinking either 215 or 235/75 R 15's would be the answer I would receive. Can you readily find 185 or 195 series tires at a local tire shop?

try 700R15LT if you're really using it for a truck, narrow tread [like original] gives the best handling, best gas mileage, and is safest on wet roads - use the 235/xx/15 if ya want a soft modern car ride, less mileage and shorter front bearing life

Bill

I run 31x10.50's on my '61 1/2 ton 2wd on 15x7 rims. They fit but look a little large. Never had a problem with rubbing or anything. They do great in the snow and handle loads effortlessly. I even have my front end lowered 2 inches and they fit. Hope this helps...

kyle

The 195/75/15 is an obsolete size. 215/75/15 is pretty close to the OE, you could go with a 235/75/15, but that's pushing it on that narrow of a rim. If you realy want wider tires, 1-upgrade the bearings, and 2- get wider wheels, at least a 7". As long as you go with a fitment from an '87 or ealier GM 4x4 with the 3 1/2" backspace, you'll be fine. I've fit 32x11.50x15s under a '66 with no rubbing, although it was a bit tight in the rear.

I'll just go with 215's...they are easy enough to find and should look good. Thanks!