What size off-set/back spacing should i get??? - Ford Powerstroke Diesel Forum

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post #1 of 7 Old 12-26-2011, 02:20 PM Thread Starter
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What size off-set/back spacing should i get???

I have a 02 Ford F-350 single rear wheel. I just run across a 6" rough country lift and a set of four 36x15.50x20 mickey baja mtz's for a great price and bought them. I'm going to buy a set of 20x12 wheels. what off-set/back spacing should I get on these wheels for less worry about rubbing since the tires are 15.50 wide? I don't do much off roading if any at all in this truck. Any help or input would be great. thanks
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post #2 of 7 Old 12-26-2011, 02:27 PM
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Don't have a lot of experience with offset but I have something like a 50mm offset with a 38x15.50 tire and don't have any rubbing issues

03 F350 6.0 SRW 4X4 lariat

481hp 832tq

8" super lift 385/70r16 Toyo MT's
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post #3 of 7 Old 12-27-2011, 08:27 AM
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You are going to have a tough time fitting 15.5" wide tires and 12" wide wheels under 6" of lift. Most 12" wide wheels have a deep negative offset (-44 is pretty common) and those are going to rub even on a street queen.
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post #4 of 7 Old 12-27-2011, 01:30 PM Thread Starter
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I was looking and 10" wide wheels look to have mainly a -24mm offset. would this offset be better or worse than the -44mm offset on the 12" wide wheel for what i'm trying to do? would a 15.50 wide tire fit on a 10" wide wheel? and fit without wearing the tire out quickly?
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post #5 of 7 Old 12-27-2011, 02:36 PM
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I have run 37x13.50 Nitto Mud Grapplers (which actually measure just over 37" tall and just over 14" wide) on a 10" wide wheel with -24 offset and 6.5" lift. It rubbed badly enough to crunch the rear corner of my front fender once but that was offroad. Street driving was never a problem with rubbing at all after I pulled the fender liners back just a tad.

Bottom line...15.50" wide tire on a 10" wide wheel with -24 offset should fit with minor trimming if it is on-road only. See what the mfg lists as minimum rim width on that tire. I think you should be fine.
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post #6 of 7 Old 12-28-2011, 05:45 AM
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Have you thought about adding 2" front brackets to give you that extra clearance. Shouldn't cost that much

03 F350 6.0 SRW 4X4 lariat

481hp 832tq

8" super lift 385/70r16 Toyo MT's
FatBoy traction bars
Durastroke stg1
intake
MBRP 5" straight pipe
Custom tuned by Vivian "Looney Wild Track"
Edge Insight CTS
Zoodad mod
high idle mod
6.4 banjo bolts
Updated fuel pressure regulator (Blue spring mod)
EGR cooler delete
6K 55w HID's
6k 35w fog HID's
B&W turnover ball


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post #7 of 7 Old 12-28-2011, 01:43 PM Thread Starter
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Guess I'll just have to try it and if it rubs horrible add a 2" shackle/hanger lift on the front
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