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 Backspacing for 35's
#1069573
02/26/14 02:47 PM
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Joined: Jan 2005
Posts: 899
OP
Rock Warrior
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2000 Montero, will have 2" BL before larger tires.
Looking at 35" BFG KM2s, 12.5" wide, on 15x8 rims.
Is 3.5" okay for backspacing?
I apologize if this is a common question, I thought I'd read it somewhere but can't find it now.
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Re: Backspacing for 35's
[Re: Fujisawa_Rob]
#1069574
02/26/14 04:09 PM
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Joined: Jan 2002
Posts: 6,134
Trail Leader
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That's what i run and i have no rubbing and no suspension lift anymore. 35x13.5 on 15x10" wheels 3.5 BS
1999 Montero SAS'd on Kings and stuff
1998 Montero trying to get a V8 Swapped
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Re: Backspacing for 35's
[Re: TOASTY]
#1069575
02/26/14 10:49 PM
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Joined: Jun 2002
Posts: 6,211
Trail Leader
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I run 35x12.5/15 on 8" wheels with 3.5 - 3.75" BS with no problems.
I also run my 86 with 33x12.5-15 on the stock 7" SR wheels with virtually no problems. It will rub when leaving a downward facing driveway with the wheels cranked all the way to the right, but that's not the fault of the backspacing.
John B.
'87 Raider 2.6 Turbo Auto, Under Construction
'95 Montero SR, 35x12.5/15 BFG M/T KM-2's, Rock sliders, Qtr panel chop, gas tank lift, 2" BL, Aisins, 5.29s
'95 Pajero Mini
'98 Montero Winter Ed.
'04 Cadillac XLR
'03 Kawasaki ZRX1200R
'60 Ford Falcon 4Dr
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Re: Backspacing for 35's
[Re: JohnnyBfromPeoria]
#1069576
02/26/14 10:54 PM
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Joined: Jan 2005
Posts: 899
OP
Rock Warrior
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I run 35x12.5/15 on 8" wheels with 3.5 - 3.75" BS with no problems.
I also run my 86 with 33x12.5-15 on the stock 7" SR wheels with virtually no problems. It will rub when leaving a downward facing driveway with the wheels cranked all the way to the right, but that's not the fault of the backspacing.
John B. Hmm...does the 86 get much highway time? I'd be a little concerned about a 12.5" wide tire on a 7" rim. I think they'd be fine off-road.
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Re: Backspacing for 35's
[Re: Fujisawa_Rob]
#1069577
02/27/14 03:40 AM
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Joined: Jun 2002
Posts: 6,211
Trail Leader
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[quote]Hmm...does the 86 get much highway time? I'd be a little concerned about a 12.5" wide tire on a 7" rim. It's fine. I used to run Toyo Open Country M/T's in 33x12.5/15 on the stock 7"W wheels (95 SR) and they wore evenly and the truck handled well with that set-up. John B.
'87 Raider 2.6 Turbo Auto, Under Construction
'95 Montero SR, 35x12.5/15 BFG M/T KM-2's, Rock sliders, Qtr panel chop, gas tank lift, 2" BL, Aisins, 5.29s
'95 Pajero Mini
'98 Montero Winter Ed.
'04 Cadillac XLR
'03 Kawasaki ZRX1200R
'60 Ford Falcon 4Dr
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Re: Backspacing for 35's
[Re: JohnnyBfromPeoria]
#1069578
02/27/14 03:44 AM
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Joined: Jan 2005
Posts: 899
OP
Rock Warrior
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I'm not having much luck finding wheels with a 108mm center opening, at least used.
New, there's the Black Rock 15x8, 4.25" center bore. Offset is listed as 4", but I don't know the backspacing.
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Re: Backspacing for 35's
[Re: Fujisawa_Rob]
#1069579
03/03/14 03:00 AM
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Joined: Sep 2009
Posts: 476
Mudrunner
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I'd still like to run 35x12.5 on the stock rims. I really just like the look of the stock rim and of course hate to spend money on new ones if i don't have to.
Anyone run a 35x12.5 on a stock 7" rim?
1992 VR4 12.5 @ 110 - SOLD
1993 Stealth RT/TT 11.4 @ 129 - SOLD
1991 VR4 9.2 @ 159 - Old Shop Car
1992 Stealth Twin Turbo ATX - SOLD
1990 Montero LS LWB - RIP
1995 Montero LS - RIP
1998 Montero
1992 Galant VR4 474/1000
2007 Prius
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Re: Backspacing for 35's
[Re: MBrannon]
#1069580
03/03/14 05:21 AM
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Joined: Jun 2002
Posts: 6,211
Trail Leader
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Anyone run a 35x12.5 on a stock 7" rim? Even better, my next-door neighbor caught the 1st Gen bug years ago and a shop actually mounted 33x12.5/15's on the stock 6" wheels. That's about as tight as I've seen. It would work, but I'd be very careful to set air pressure with a "chalk check," for proper tread pattern spread. You might end up at some crazy low pressure to get the set-up right, but keep in mind the tires are rated to carry a lot more weight at max pressure than you need them to do, so a lower cold pressure may be the only way to get them to form a good contact patch. John B.
'87 Raider 2.6 Turbo Auto, Under Construction
'95 Montero SR, 35x12.5/15 BFG M/T KM-2's, Rock sliders, Qtr panel chop, gas tank lift, 2" BL, Aisins, 5.29s
'95 Pajero Mini
'98 Montero Winter Ed.
'04 Cadillac XLR
'03 Kawasaki ZRX1200R
'60 Ford Falcon 4Dr
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Re: Backspacing for 35's
[Re: Fujisawa_Rob]
#1069582
03/05/14 07:42 PM
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Joined: Jan 2000
Posts: 16,227
Web Wheeler
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What's the center bore? Needs to be at least 108mm... which is really max for a 6x5.5" bolt pattern rim.
Otherwise I think they will work. Always test fit them first though if at all possible. That's what I did at America's tire when buying my rims.
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