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Old 10-01-2010, 08:23 AM   #1
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33x10.5x15 vs. 33x12.5x15

Hi,
Just wondering if anyone has any input, I'm getting some 33's soon and i have 2 questions.

bfg km2 or gy mtr with kevlar?

The tires will be used on my tj which is my DD but gets used in trails often when I can get out. Here in the great white north I'll be driving them in lots of different stuff, mud, rocks, snow etc.

Also, 33x10.5 which I like and can get with the bfg km2's or 33x12.5 which I can get with either? Any pro's or cons to either size?

Any input and suggestions would be great!

Thanks a lot guys,
Ben

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Old 10-01-2010, 08:33 AM   #2
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10.5's weigh less, fit stock wheels and are better in deep snow. 12.5's require different wheels or spacers and will be ok in snow, etc.

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Old 10-01-2010, 08:38 AM   #3
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I do have some 15x8 steelies, do you have any suggestions between the two tires? Bfg km 2 and gy mtr kevlar?

Thanks
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Old 10-01-2010, 08:41 AM   #4
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MBLG - I love your question because it is the EXACT decision I am pondering (for the same reasons!), but with Maxxis Bighorns and Buckshots thrown in, too. I don't have any snow to contend with and have plans for new wheels anyway, so I am leaning towards the 12.5. PLEASE let me know what you finally decide and WHY. Thanks!
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Old 10-01-2010, 08:54 AM   #5
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Quote:
Originally Posted by ScoutandChief
MBLG - I love your question because it is the EXACT decision I am pondering (for the same reasons!), but with Maxxis Bighorns and Buckshots thrown in, too. I don't have any snow to contend with and have plans for new wheels anyway, so I am leaning towards the 12.5. PLEASE let me know what you finally decide and WHY. Thanks!
Scoutandchief, it's a hard decision eh, from what I know and I have seen, both the tires I'm considering, bfg km2 and gy mtr kevlar, are great offroad and well mannered on road. I dont have any experience with the big horns or buckshots though.

Hopefully we can get some more advice,
I think I'm leaning towards 33x10.5 bfg km2's
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Old 10-01-2010, 08:56 AM   #6
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Just look at the tread pattern on both of the tires; that'll tell you which is best for your needs.

If you're dealing mostly with pavement / rocks, you want the most tread on the tire to make the largest contact surface with the road/rocks. If you're going to be doing mostly mud/clay/slimey driving; you want the tire that will clean out the gunk between the treads quicker.

The Wranglers have larger voids between the blocks which theoretically allow for quicker cleaning in sloppy conditions. The KM2s seem to have more tread surface on them which would be better for road/rocks.

Both have large tread blocks with minimum siping which don't always work well in snowy conditions. In the case of snow or mud, the narrower the tire, the easier it is for the tire to sink down to the bottom of the looseness and get to the solid ground for traction. A wider tire tends to sit more on top of the loose ground (snow or mud). That's why tractor tires are so tall and narrow, to get down into the solid ground and get traction.

I recently bought a set of Wrangler DuraTrac tires 285 75 16 (33"x11.5") and love them on the road. They're great in the dirt and the mud so far. I just wish they'd clean out faster like a MT. BUT, they are an AT tire and perform exceptionally well as an AT.
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Old 10-01-2010, 09:13 AM   #7
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Quote:
Originally Posted by YAHAHA
Just look at the tread pattern on both of the tires; that'll tell you which is best for your needs.

If you're dealing mostly with pavement / rocks, you want the most tread on the tire to make the largest contact surface with the road/rocks. If you're going to be doing mostly mud/clay/slimey driving; you want the tire that will clean out the gunk between the treads quicker.

The Wranglers have larger voids between the blocks which theoretically allow for quicker cleaning in sloppy conditions. The KM2s seem to have more tread surface on them which would be better for road/rocks.

Both have large tread blocks with minimum siping which don't always work well in snowy conditions. In the case of snow or mud, the narrower the tire, the easier it is for the tire to sink down to the bottom of the looseness and get to the solid ground for traction. A wider tire tends to sit more on top of the loose ground (snow or mud). That's why tractor tires are so tall and narrow, to get down into the solid ground and get traction.

I recently bought a set of Wrangler DuraTrac tires 285 75 16 (33"x11.5") and love them on the road. They're great in the dirt and the mud so far. I just wish they'd clean out faster like a MT. BUT, they are an AT tire and perform exceptionally well as an AT.
That makes sense, thanks, what was my thought about the narrower tire, I haven't seen to many jeeps with 33x10.5's though, wondering how it'll look, sure it'll look good.

I have 31x10.5 bfg at's now which have been surprisingly good overall except mud that's why I'm look at mt's
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Old 10-01-2010, 09:16 AM   #8
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If you're not worried about snow, then the advice for the narrower tire is GOOD, but

If you do have to worry about DEEP snow (2' and deeper) then the widest tire in "load Range C/D) is the best, but

You'll suffer a MPG loss all the rest of the time !!

The narrower tire requires LESS mods, like IG says !

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Old 10-01-2010, 09:29 AM   #9
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yeah the less mods was another reason I was thinking about the narrower one, I was planning 2.5" ome lift and tube fenders up front, probably genright, any thoughts on those?
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Old 10-01-2010, 09:40 AM   #10
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I'm not a fan of those tube bumpers, but genright makes some with what looks to be strong recovery points, so that might not be a bad idea !!


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yeah the less mods was another reason I was thinking about the narrower one, I was planning 2.5" ome lift and tube fenders up front, probably genright, any thoughts on those?
Since you're in Canada, you PROBABLY see your share of snow, so unless it's always light snow, I'd think more about the wider tires and do some playing this winter to find out how far you'll have to "SAFELY"airdown (only for DEEP snow)-that takes some practice !!

good luck

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Old 10-01-2010, 09:44 AM   #11
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I'd definitely go with 12.5's. I am running 33 x 12.5's on my 95 yj and love my ability to get in and out of mud. As far as tires go I am running old school BFG MT's and put alot of research into tires for my wife's jeep and decided to go with pro comp MT's. As far as fit just make sure the wheel is properly backspaced for her TJ I went with 3.75 don't bother with spacers unless it's a last resort.
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Old 10-01-2010, 09:50 AM   #12
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Originally Posted by JIMBOX
I'm not a fan of those tube bumpers, but genright makes some with what looks to be strong recovery points, so that might not be a bad idea !!
No tube bumpers for me, not a fan either, I'm looking at the tube fenders to help clear those 33's

You think I would be fine running those 33's with the old man emu 2.5" lift and tube fenders?
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Old 10-01-2010, 10:02 AM   #13
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OME is one of the top "lift" kits and I think they have shock/lift pkg's too


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Originally Posted by MBLG View Post
No tube bumpers for me, not a fan either, I'm looking at the tube fenders to help clear those 33's

You think I would be fine running those 33's with the old man emu 2.5" lift and tube fenders?
If you get the lift, the stock bumpers will clear the tires , but-

There will be many other mods that will have to be done for lift/tires/clearance/axle position/LCA's-etc

Unless you get some real boggers, your 33" tires are going to be 32+ inch's installed anyway-

Mine are 33.2", but they're Hankook Dynapros LT295/75x16

My bumpers are OLYMPIC "rock" bumpers





Better look at the "Sticky" for "lift reviews" and get some INFO !!

Good luck

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Old 10-01-2010, 10:09 AM   #14
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Originally Posted by JIMBOX
OME is one of the top "lift" kits and I think they have shock/lift pkg's too

If you get the lift, the stock bumpers will clear the tires , but-

There will be many other mods that will have to be done for lift/tires/clearance/axle position/LCA's-etc

Unless you get some real boggers, your 33" tires are going to be 32+ inch's installed anyway-

Mine are 33.2", but they're Hankook Dynapros LT295/75x16

My bumpers are OLYMPIC "rock" bumpers

Better look at the "Sticky" for "lift reviews" and get some INFO !!

Good luck

JIMBO
Thanks alot, that's a nice looking JK you got there

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