Pros and Cons of an 8" rim on a 37" tire

buffethat@comcast.ne · 02-25-07, 12:00 PM

I have some brand new 37" GY MTR's that are mounted on 15x8's. They will be mounted on a 85 4Runner 3" wider all around. I am thinking I want to go to 10" rims so the side walls are straighter and a little wider stance. Most of the ones I have found have a 3.75" BS.

What are the pros and cons of each size rim?

ajfriz · 02-25-07, 07:25 PM

It depends on the width of the tire. I assume it's a 12.50. I know a lot of guys that are running 8" rims so that they can air down and not blow a bead. If you keep the air pressure where it's supposed to be (35 psi I think) it can give you abnormal wear in the center of the tire. I am currently running a 12.50 on a 6" rim. I didn't know they were as skinny as they were until I took the old tires off which were 10.50. The 10.50s did not look like they were bulged or anything implying that it wasn't such a skinny rim. I am switching to 8" rims as soon as I can so that I won't destroy my tires in 5,000 miles.

slickrok · 02-25-07, 07:27 PM

Stick with the 8's you will be just fine. I have ran 35" and 33" tires (MTR's and BFG Muds) on this size wheel, never lost a bead and also have had very good wear characteristics. With a 10" you might lose a bead quicker and will not gain anything in the wear/flotaion dept..........or very little.

BudKing · 02-25-07, 09:17 PM

I run the same tire on 7 inch wide rims
I like it with no problems

Tools R Us · 02-26-07, 11:46 AM

I have 37 x 12.5 Cooper STT's on Tundra 7.5's, only had them a couple of weeks, but liking them.

02-25-07, 12:00 PM	#1
buffethat@comcast.ne IH8MUD Junior Join Date: Nov 2006 Location: Roxborough, CO Posts: 111	Pros and Cons of an 8" rim on a 37" tire I have some brand new 37" GY MTR's that are mounted on 15x8's. They will be mounted on a 85 4Runner 3" wider all around. I am thinking I want to go to 10" rims so the side walls are straighter and a little wider stance. Most of the ones I have found have a 3.75" BS. What are the pros and cons of each size rim? __________________ Thanks Tom 1985 4Runner(again) Marlin crawler Ult. 5.29 with Elockers frt&rr, High pinion front with custom axles JPR motor with headers into 2.25 exhaust Marlin lift on 37's and a ton of other goodies. TLCA #6136 DD is a 2005 GMC Crew Cab 4x4 loaded.

02-25-07, 07:25 PM	#2
ajfriz IH8MUD Regular Join Date: Mar 2003 Posts: 495	It depends on the width of the tire. I assume it's a 12.50. I know a lot of guys that are running 8" rims so that they can air down and not blow a bead. If you keep the air pressure where it's supposed to be (35 psi I think) it can give you abnormal wear in the center of the tire. I am currently running a 12.50 on a 6" rim. I didn't know they were as skinny as they were until I took the old tires off which were 10.50. The 10.50s did not look like they were bulged or anything implying that it wasn't such a skinny rim. I am switching to 8" rims as soon as I can so that I won't destroy my tires in 5,000 miles. __________________ 1978 FJ40 283 v8-sold :( 1986 4runner SAS and stuff

02-25-07, 07:27 PM	#3
slickrok IH8MUD Rookie Join Date: Feb 2006 Posts: 26	Stick with the 8's you will be just fine. I have ran 35" and 33" tires (MTR's and BFG Muds) on this size wheel, never lost a bead and also have had very good wear characteristics. With a 10" you might lose a bead quicker and will not gain anything in the wear/flotaion dept..........or very little. __________________ 85 SR5 Flatbed with ARB's, Marlin, 35" MTR's, Highsteer, 9K Warn, All-Pro bumper/sliders, some LC stuff under the hood and custom Iron Pig work.

02-26-07, 11:46 AM	#5
Tools R Us IH8MUD Lifer Join Date: Jul 2004 Location: Chandler, AZ Posts: 6,516	I have 37 x 12.5 Cooper STT's on Tundra 7.5's, only had them a couple of weeks, but liking them. Attached Images __________________ Kevin Patterson '96 LX450 '84 4x4 Mini '73 FJ40 Copper State Cruisers #007 "We have come to the conclusion that we can run our car over any road that a man can take a team of horses and a wagon, providing we can get traction." Dr. Horatio Nelson Jackson, 1903

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02-25-07, 09:17 PM	#4
BudKing IH8MUD Junior Join Date: Apr 2003 Posts: 141	I run the same tire on 7 inch wide rims I like it with no problems