JOMJ87 Posted November 20, 2006 Share Posted November 20, 2006 Ok I just wanted to see what everyone thought was the smallest wheel you could go with mounting a 35x12.50 BFG. I have 15x8s but i need a spare and wanted to use a stock steely but don't know if the tire would mount on a 15x7 wheel. Anyone have any knowledge on this??? Thanks Cole Link to comment Share on other sites More sharing options...
Bounty Hunter Posted November 20, 2006 Share Posted November 20, 2006 You can put it on a 7" rim, you'll be fine. Link to comment Share on other sites More sharing options...
rejeep Posted November 20, 2006 Share Posted November 20, 2006 I have always carried a smaller width spare... for example.. on my YJ I run 33x12.5. on 15x8 but my spare is only a 33x9.50 on a 7 in rim.. It saves weight, and not to mention space in a YJ.. I guess with an MJ its not such a big issue, but just food for thought.. Link to comment Share on other sites More sharing options...
87manche Posted November 20, 2006 Share Posted November 20, 2006 I'd run a 33x9.5 for a spare on a stock rim. Not because you'll have problems with that tire on the rim width, but the backspacing on a stock rim will make it SUCK if you have to drive off a trail. It will rub on everything. Link to comment Share on other sites More sharing options...
JOMJ87 Posted November 20, 2006 Author Share Posted November 20, 2006 The rub was why I was thinking stock wheels. I got a black rock crawler wheel but it almost hits without a tire so I may trade for a better backspacing. I can't complain to much it was free to me for setting up some gears for a friend. :brows: Cole Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 21, 2006 Share Posted November 21, 2006 My spare is a 35x12.5 on a 15x7... Works good. If a tire shop won't mount it (I know some that won't) tell them to go @#$% themselves and take it to a mom and pop shop. Link to comment Share on other sites More sharing options...
once red Posted November 21, 2006 Share Posted November 21, 2006 Maybe I misread the post, but I want to give my .02 worth on this: Guys, it's important that your SPARE tires are the same Overall Diameter as the ones you're running. If you do get a flat and use a tire with a smaller O.D. say goodbye to the gears :popcorn: Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 21, 2006 Share Posted November 21, 2006 It's okay as long as you have an open diff or a slippy LSD. Link to comment Share on other sites More sharing options...
JOMJ87 Posted November 21, 2006 Author Share Posted November 21, 2006 Yeah what Dirty said... If you have a traction device you will burn it up like me I have to have as close as possible. Alot of the local guys run with in one tire size spares and never have issues but the Open diff guys like most of the stock MJs can run a 44 on one side and a 28 on the other and nothing will burn up.(thats just an exageration so don't go doing it. :D ) With that said on my first and only trip to Tellico I had 0 issues all day except my T-case slipping inbetween low and neut. and the day killer was the fist size pucture on my rear 35" tire.I had a 33 spare but it was an aluminum wheel and used the shafted kind of lug nuts(for lack of better term) which I forgot 4 hours away in my garage. needless to say I came out with a stock spare on one side and a turdy-five on the other also a really red face :oops: when wwe drove by rock garden with everyone stairing and again alittle latter when we drove threw a crowd of 25 or so and the park ranger stopped us to tell us we would burn our gears up and we told him it was open diff. and he said "well you must've been stupid to try this place" after telling him all the trails we went on he shook his head and walked away. Sorry for the long story but I thought Id share my stupid moment. :dunce: Cole Link to comment Share on other sites More sharing options...
Oizarod115 Posted November 21, 2006 Share Posted November 21, 2006 Yeah what Dirty said... If you have a traction device you will burn it up like me I have to have as close as possible. Alot of the local guys run with in one tire size spares and never have issues but the Open diff guys like most of the stock MJs can run a 44 on one side and a 28 on the other and nothing will burn up.(thats just an exageration so don't go doing it. :D ) With that said on my first and only trip to Tellico I had 0 issues all day except my T-case slipping inbetween low and neut. and the day killer was the fist size pucture on my rear 35" tire.I had a 33 spare but it was an aluminum wheel and used the shafted kind of lug nuts(for lack of better term) which I forgot 4 hours away in my garage. needless to say I came out with a stock spare on one side and a turdy-five on the other also a really red face :oops: when wwe drove by rock garden with everyone stairing and again alittle latter when we drove threw a crowd of 25 or so and the park ranger stopped us to tell us we would burn our gears up and we told him it was open diff. and he said "well you must've been stupid to try this place" after telling him all the trails we went on he shook his head and walked away. Sorry for the long story but I thought Id share my stupid moment. :dunce: Cole :rotfl2: and they looked at us like dummies for having a donut as a spare with 215s hahahaha. wow. i bet the truck had gangsta limp f-real. haha. Link to comment Share on other sites More sharing options...
Eagle Posted November 21, 2006 Share Posted November 21, 2006 Width is a real problem in the rear, though. The rule-of-thumb for tires is that the width should not be more than 4" greater than the rim width, which would mean an 8.5" rim for 12.50" tires -- but I know a lot of people who cheat on that by an inch or so with no problems. But ... if your rear axle is stock, or close to stock width, you'll have an interference fit. I was running 31x10.50s on OEM 15x7 rims on mine. In the rear, the tires were VERY close to the spring leaves, and when I would have the tires off I could see that the inner sidewall was rubbing against the inside of the wheelwell above the frame rail. Running tires 2 inches wider will put your inner sidewall 1 full inch closer to the sheet metal -- which will equate to being in contact with it. Link to comment Share on other sites More sharing options...
feerocknok Posted November 21, 2006 Share Posted November 21, 2006 According to BFGoodrich, the 35x12.50R15/C A/T or M/T should be mounted on an 8.5 - 11 inch wide rim. Link to comment Share on other sites More sharing options...
Bounty Hunter Posted November 21, 2006 Share Posted November 21, 2006 According to BFGoodrich, the 35x12.50R15/C A/T or M/T should be mounted on an 8.5 - 11 inch wide rim. Yes, most tire manufacturers recommend such but it's no reflection as to what can be used in the real world. Link to comment Share on other sites More sharing options...
87manche Posted November 21, 2006 Share Posted November 21, 2006 Width is a real problem in the rear, though. The rule-of-thumb for tires is that the width should not be more than 4" greater than the rim width, which would mean an 8.5" rim for 12.50" tires -- but I know a lot of people who cheat on that by an inch or so with no problems. But ... if your rear axle is stock, or close to stock width, you'll have an interference fit. I was running 31x10.50s on OEM 15x7 rims on mine. In the rear, the tires were VERY close to the spring leaves, and when I would have the tires off I could see that the inner sidewall was rubbing against the inside of the wheelwell above the frame rail. Running tires 2 inches wider will put your inner sidewall 1 full inch closer to the sheet metal -- which will equate to being in contact with it. that's the problem I was hinting at. A tire that wide on a stock steelie is going to rub just siting there. I rubbed my 10.5 on the inside of the frame rial out back and the LCA's up front. I can't imagine what a tire 4" taller and 4" wider would do. You couldn't steer if it was up front, and you probably couldn't fit it on if it were out back. Link to comment Share on other sites More sharing options...
JOMJ87 Posted November 21, 2006 Author Share Posted November 21, 2006 Ok I guess i need to find a whell with the correct backspacing. Thanks for the info guys. Cole Link to comment Share on other sites More sharing options...
Derek Posted November 21, 2006 Share Posted November 21, 2006 According to BFGoodrich, the 35x12.50R15/C A/T or M/T should be mounted on an 8.5 - 11 inch wide rim. what does interco say about the 38.5x15.5 's? i mounted them on 7" wide wheels and they kicked @$$ down to 8 psi Link to comment Share on other sites More sharing options...
feerocknok Posted November 21, 2006 Share Posted November 21, 2006 According to BFGoodrich, the 35x12.50R15/C A/T or M/T should be mounted on an 8.5 - 11 inch wide rim. what does interco say about the 38.5x15.5 's? i mounted them on 7" wide wheels and they kicked @$$ down to 8 psi For your humour: According to Interco Tire, the 38x15.50R16.5LT Super Swamper Radial TSL should be mounted on a 9.75-12 inch wide rim. I agree on running narrow rims to keep a bead, but I'm not sure how the manufacturers come up with these numbers. Link to comment Share on other sites More sharing options...
Derek Posted November 21, 2006 Share Posted November 21, 2006 the rim size the manufacturers specifies it based on their testing basically take the weight of thier test vehical, specific pressure, and width of the wheel to get the tire to have even contact all the way across Link to comment Share on other sites More sharing options...
JOMJ87 Posted November 21, 2006 Author Share Posted November 21, 2006 :rotfl2: and they looked at us like dummies for having a donut as a spare with 215s hahahaha. wow. i bet the truck had gangsta limp f-real. haha. You couldnt even say a limp it looked like a horse with a broken leg dragging its arse on that side. Never again will that happen. (knock on wood) Cole Link to comment Share on other sites More sharing options...
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