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Old 04-08-2008, 07:19 AM   #1 (permalink)
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gearing vs. tires

I just bough an 88 tintop and want to put some agressive tires what is the largest tire I can run without changing gears?
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Old 04-08-2008, 07:45 AM   #2 (permalink)
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Depends. Do you plan on lifting it at all? What kind, if any, wheeling you plan on doing?

31's will be the max and even those will be pushing the limits of what the 1.3 motor can do. Forget highway speeds, deep mud and snow, and very limited on rockcrawling with out replacing the clutch a few times. Mild trail wheeling and mall crawling should be ok.

235x75x15's work pretty well with stock gearing. Still not the best for rockcrawling, but with 235's you won't be on rocks all that big anyways.
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Old 04-08-2008, 08:47 AM   #3 (permalink)
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I ran worn 33s with stock drivetrain, even limited highway miles. First kinda sucked and low range wasn't low - but it was driveable
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Old 04-08-2008, 10:13 AM   #4 (permalink)
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I thought my bfg mt 30x9.5s worked quite well with stock gears. Stock rims, Virtual lift, YJs under the axle (though they would have cleared fine with stock springs and the virtual lift), for both city and highway, and mild trail wheeling/exploring.
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Old 04-08-2008, 11:10 AM   #5 (permalink)
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I mainly DD my rig but want more agressive tires than it has that is why I was wondering how big you can go without much power loss
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Old 04-08-2008, 11:15 AM   #6 (permalink)
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I did a spring over lift and went to 31 10.5s on 2" backspacing wheels. I liked it alot. 4 to 1 transfer case really makes the setup perfect thought

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Old 04-08-2008, 01:18 PM   #7 (permalink)
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Quote:
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I mainly DD my rig but want more agressive tires than it has that is why I was wondering how big you can go without much power loss
Interco makes the super swamper in some small sizes! I believe they are in the 28-29 inch range which is like a 235x75x15. Those with very minor mods will get you some of the best traction type of tire and DD won't be effected all that much.
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Old 04-08-2008, 02:38 PM   #8 (permalink)
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Mine on 235s was pretty able with a welded rear diff, and not too gutless.
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Old 04-08-2008, 10:50 PM   #9 (permalink)
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I just bought an 88 tintop and want to put some aggressive tires what is the largest tire I can run without changing gears?
215x75R15 fit Samurais without any changes to suspension or gears on factory rims.
235x75R15 (29") and 30x9.5R15 need about a 2" lift, and should use wider rims. You might get away with 235's on factory 5.5" rims (but 6-7" recommended), whereas 30's should be on 6.5" and wider (7-8" recommended).
31x10.5R15 needs about a 3" lift, on 7-9" rims and likely need an inch or more of negative offset/reduced backspacing.

Somewhere between the 235's and the 31's you might want to consider a 4.16:1 transfer case to take advantage of its 12% lower gearing in high-range. That 12% mathematically compensates almost exactly for 31" tires. Rim sizes are based on my tire choice, BF Goodrich AT/KO. Others might vary a bit.

Last edited by Merlin'93; 04-09-2008 at 11:53 AM. Reason: add omitted info for 31" tires/rims
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Old 04-09-2008, 04:06 AM   #10 (permalink)
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thanks for the info guys, I will probably get me some 215's in a bfg. Procomp used to offer a 215 size but I cant find them locally does anyone know if they are still made?
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Old 04-09-2008, 10:37 AM   #11 (permalink)
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My DD samurai only has a bit longer shackles, so I can't run anything in the 31" tall class. But I have used the 27x9.50-15 super swamper ssr's, they work great, and don't effect gearing hardly at all, just a little more weight to turn. My buddies run the 215/75 bfg all terrains in the summer, and the 215/75 mud terrains in the winter, and they like them alot, and say that they don't effect gearing enough to notice. I am currently running the 29x8.50-15 super swamper TSL bias ply. They are tall enough plus the extra weight and rolling resistance that it kinda sucks with stock gears. Its drivable, just not a lot of high speed on the highway. Off road it does ok, but deep sand or mud is kind of a challenge. But even so, it goes a lot more places than it did on stock sized all terrains.

Good luck with your tire purchase.

[edit] I don't think procomp makes anything under 30 inches tall anymore. you might be able to get their all terrains in a 235/75, but I'm not even sure they make those anymore.
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Last edited by Suzuki530; 04-09-2008 at 10:38 AM.
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