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Old 12-31-2010, 09:31 PM   #1
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I need your suggestions for wheel size...

I have been trying for about 45 minutes to figure out how to match tires to wheels as far as wheel width goes. I can't figure it out... and then I remembered all these helpful people on this website! Isn't laziness great? Anyways I'm looking to order 32x11.5 Buckshots.If you have this size of tire, I would love to hear what size wheels you have because I'm going to pull my hair out trying to figure this out by myself. Thanks a ton!

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Old 12-31-2010, 11:11 PM   #2
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Although others will disagree here are my thoughts:

15x8 wheel = no tire larger than 10 inches
15x10 wheel = no tire larger than 12.5 inches

I've read where guys are putting 33x12.50x15 tires on 15x8 inch wheels....in my eyes thats screaming for the bead to break by pressure alone.

If I was buying the Maxxis tires your referring to, which I also am considering, Id put them on a 15x10 rim. Just my .02 cents

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Old 12-31-2010, 11:18 PM   #3
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for 11.50 wide tire I would go with a 15x8, which is good for upto a 12.50 wide tire.
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Old 12-31-2010, 11:19 PM   #4
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That actually is backwards. It takes more PSI to hold a 12.5" tire on a 10" rim than it does on a 8" rim. Having an 8" rim with wider tires, 12.5", protects the rim and keeps the bead on the rim a whole lot better than a 10" rim. Do a search as they have talked about this quite a bit in the forum
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Old 12-31-2010, 11:25 PM   #5
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Yes!!

Thanks for the advice!
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Old 12-31-2010, 11:26 PM   #6
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I used to run 32 X 11.5 tyres on stock 15 X 8 rims with 5.5" Backspacing.

I had to put a couple of washers on the steering stops to stop rubbing at full lock and it was pretty tight in the rear wheel wells but never had any rubbing. I think a bit less (more?) backspacing would have been ideal, but I never had any problems with that set-up.

Oh yeah, that was with a OME 2" lift.
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Old 01-01-2011, 08:25 AM   #7
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I wasn't saying it wouldn't work just saying I wouldn't do it. Of course there's more air, it's a bigger tire. I think there would be less pressure around the bead if a 12.5 was on a 10 inch wheel. I'm not referring to protecting a wheel, just the physical pressure if the air pushing outward on the smaller wheel.

Maybe I'm backwards I don't know. Just looking at that set-up the way the tire sticks out from the wheel don't sit well for me.
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Old 01-01-2011, 11:09 AM   #8
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I wasn't saying it wouldn't work just saying I wouldn't do it. Of course there's more air, it's a bigger tire. I think there would be less pressure around the bead if a 12.5 was on a 10 inch wheel. I'm not referring to protecting a wheel, just the physical pressure if the air pushing outward on the smaller wheel.

Maybe I'm backwards I don't know. Just looking at that set-up the way the tire sticks out from the wheel don't sit well for me.
Less air in bigger tires. The larger the tire, the less psi needed to fill it.... Look at the max ratings on a 27" tire, verses a 35......

You can air down a 12.5 on an 8" wheel, much more than on a 10" wheel, as there's more pressure due to the decreased wheel size to hold the tire on the wheel when you are off road. I can't think of any example at the moment of a circumstance where friction holds something in place ( I'm kinda stupid today...) But if you think about it, the more friction there is, the lower the likely hood of slipping out of position. With a 10" wheel and a 12.5" tire you have to have more air in the tire to keep it seated in the bead.
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Old 01-01-2011, 12:23 PM   #9
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This gets talked about a great deal. Few things to consider. The air pressure on the inside of the tire say at say 15 psi, will be 15psi in any rim. That is constant. The less wide rim theory comes into play that the side wall of the tire will have more force "pushing" out against the rim on the narrow rim than the wider rim. Thus at even lower psi will help to add force to keep the tire on the rim. So you can air down more. However The whole idea of airing down is to get a bigger contact patch. Which if you have a wider rim, your tire is starting out wider so in theory you may not need to air down as much to get the same contact patch as with a narrow rims.

That being said, I have run both 8" and 10" rim and didn't notice any difference when aired down.
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Old 01-01-2011, 01:15 PM   #10
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Originally Posted by 94YJGUY View Post
Although others will disagree here are my thoughts:

15x8 wheel = no tire larger than 10 inches
15x10 wheel = no tire larger than 12.5 inches
Actually, you'd find that the usual wheel size used by offroaders for 33x12.50, 35x12.50, and 37x12.50 is a 15x8. It's only with 13.5" or wider tires where a 15x10 is recommended. It's ok to run a wider wheel for strictly street use though.

We use the 15x8 size because it takes less air pressure to keep the tire safely seated against two edges only 8" apart than when they are 10" apart. Which means you can air down to lower air pressures to allow the tire to flex more easily and thus conform to the terrain better for better traction with a 15x8 wheel than you can with a 15x10 wheel.

And don't forget that a tire's advertised width is not its bead width or its tread width... the tire's advertised width is that at its widest point, half-way up the sidewall. The tire's natural bead and tread widths are actually a couple inches narrower than its advertised width.
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Old 01-02-2011, 10:31 PM   #11
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Thanks for the clarification. I figured somebody way smarter than me would chime in. which dont take much...lol
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Old 01-02-2011, 11:58 PM   #12
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You have saved a lot of innocent hair today....So I thank you deeply, because I like my hair I'll probably end up going with 15x8. Its got more pros apparently than 15x10 and it's cheaper in most cases.

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