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Old 10-27-2009, 10:21 AM   #1
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Tire - Wheel size combo questions...

What I have = 33 x 12 1/2 x 15 tire, 15 x 8 aluminum wheel with 3 1/4 backspacing.

I bought a full size spare in a 10 1/2 width & mounted it on stock 15 x 6 spare wheel with 5 1/4 back spacing.

got 1/8" spacer and mounted it on driver rear to see how skinnier tire looks in full height (Toyo M/T, the tire I want for all 4)

I'm considering going 10 1/2's on all 4 wheels. Friends are trying to convince me to keep 12 1/2's. Arguing "contact patch", looks, etc.

I'm tired of tire rubbing at full left turn, and don't want to restrict turning by adding washers to stops.

What's your opinion ? Keep 12 1/2 size and deal with rubbing ? Is switching to 10 1/2's going to be all that bad ? I only see the positive with going narrower. Will my rock crawling traction be all that much worse ?

Also, if I do go with 10 1/2's, what size wheel-backspacing combo do I use ? 15 x 7 ? 15 x 6 ? The 5 1/4 back spacing on the 6" wheels is totally bad, seems like it would need 4 3/4 at least. What would be better with 10 1/2" width tires 6" or 7" wide wheels ?

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Old 10-28-2009, 02:31 PM   #2
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Old 10-29-2009, 11:53 AM   #3
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Old 10-29-2009, 12:10 PM   #4
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I'd stay with the 8" rims with the 10.50 tires. The 10.50's are a personnel preference IMO and have their place. Mud and snow. For kicking around the desert I'd stick with at least 12.50's but I don't think that the narrower tire will hurt you out there.
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Old 10-29-2009, 12:23 PM   #5
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Honestly, with the way tires are produced they are designed by going with a wider rim it may not neccesairly be a good thing. Find a chart for your specific type of tire and see what they recommend. I am thinking that if the width is too much you would apply more pressure to the two outsides of the tire. I could be wrong but start with the tire manufacturer recommendation.
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Old 10-29-2009, 12:35 PM   #6
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I'm tired of tire rubbing at full left turn, and don't want to restrict turning by adding washers to stops.
That's a total non-issue, you won't even notice the extremely minor increase in the turning radius. I've had two washers under both of my TJ's steering bolt stops for my 35x12.50 tires for something like 7 years now and even the day I installed the washers, I couldn't and still can't tell the difference in the turning radius. It still makes a tight u-turn on the narrowest of streets without issue.
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Old 10-29-2009, 07:45 PM   #7
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Im going with 33 x 10.5 on stock 03 Sahara rims with a 2in budget boost. You guys think im going to rub with this setup? Got the spacers on today and am picking up the tires in the morning.
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Old 10-29-2009, 07:46 PM   #8
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Also, its only got 40k on it so the springs shouldnt be too saggy.
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Old 10-29-2009, 07:48 PM   #9
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Im going with 33 x 10.5 on stock 03 Sahara rims with a 2in budget boost. You guys think im going to rub with this setup? Got the spacers on today and am picking up the tires in the morning.
A 2" suspension lift is not tall enough for 33" tires. At a bare minimum it takes 3" of clearance with 4" recommended if you offroad for 33" tires to not rub. You can also achieve that 3" minimum by adding a 1" body lift to your 2" budget boost. It'll still rub offroad though.
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Old 10-30-2009, 08:10 AM   #10
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Originally Posted by Jerry Bransford View Post
That's a total non-issue, you won't even notice the extremely minor increase in the turning radius. I've had two washers under both of my TJ's steering bolt stops for my 35x12.50 tires for something like 7 years now and even the day I installed the washers, I couldn't and still can't tell the difference in the turning radius. It still makes a tight u-turn on the narrowest of streets without issue.
Good to know, thanks.
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Old 10-30-2009, 08:16 AM   #11
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So, I guess it's easiest (and cheapest) to just stay with a 12 1/2" wide tire, and the wheels I have.

The wider tires, I noticed, do work as a "side bumper" when I slide sideways in tight spots on the trail. I guess I would lose that if I went narrower.
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Old 10-30-2009, 11:54 AM   #12
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The 33 x 10.5 BFG Mud Terrain KM2s on stock wheels fit with only the 2" spacer lift with no rubbing with the sway bar disconnected btw. Looks like at full lock they will rub the sway bar a little, but nothing a couple washers cant fix. I flexed it out with a jack and still no rubbing, im sure if came slamming down with the weight of the vehicle on it while wheelin i would get some contact, but so far so good. I get some pics later, and hopefully have time for a little offroad fun too.
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Old 10-30-2009, 07:56 PM   #13
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HA, just measured the tires and the 33x10.5 KM2s are only 32" tall and 9.5" wide. WTF?

Good thing though, cause they would be rubbing if they were true to size.
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Old 10-30-2009, 09:05 PM   #14
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I don't know about in 33inch tires but some companys make 11.5inch wide in some sizes. That would be middle of the road.

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