Newbie! What offset do I need?
03-25-2017, 11:39 AM
#1
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Newbie! What offset do I need?
Hey! I have a 2016 f150 xlt 4x4 I have the ready lift 2.25" front coil spacers and a 3" rear block. I am looking at getting aftermarket rims and a set of mud terrain tires. I wanna go with 33"x12"R17. I'm looking at 17"x9" rims or 17"x8.5"rims but I am uncertain as to what offset I should be looking for in order to fit these tires without any rub or trimming. I'm happy with a little stance but I don't want the tires to protrude out too far. Something that would be equivalent to a 1" spacer or so. And if I could fit even bigger tires with no rubbing that would be even better! Any help would be greatly appreciated! Thanks!
Last edited by Dougley; 03-25-2017 at 12:31 PM. Reason: Updating info
03-26-2017, 05:27 PM
#2
For comparison, I run 285\70\R17 (11.22" wide) on Fuel Throttles with 5.75 of backspacing. I have about 1.5" inches of clearance between the tire and stock UCA. I run Fox 2.0 coilovers set at 1" of lift.
If you ever want to go with an aftermarket UCA, you should limit the backspacing on the wheels. For example, the Camburg site says the max backspacing for their UCAs is 5.5", though this might include a fudge factor.
If you ever want to go with an aftermarket UCA, you should limit the backspacing on the wheels. For example, the Camburg site says the max backspacing for their UCAs is 5.5", though this might include a fudge factor.
03-26-2017, 11:20 PM
#3
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For comparison, I run 285\70\R17 (11.22" wide) on Fuel Throttles with 5.75 of backspacing. I have about 1.5" inches of clearance between the tire and stock UCA. I run Fox 2.0 coilovers set at 1" of lift.
If you ever want to go with an aftermarket UCA, you should limit the backspacing on the wheels. For example, the Camburg site says the max backspacing for their UCAs is 5.5", though this might include a fudge factor.
If you ever want to go with an aftermarket UCA, you should limit the backspacing on the wheels. For example, the Camburg site says the max backspacing for their UCAs is 5.5", though this might include a fudge factor.
I ran 2" spacers on my stock wheels on 285/70R17s and at any flex during max turn they would rub. Level ground no rubbing. I would estimate that 1.5" spacers would have no rub, but I haven't measured so am just guessing.
A quick Google search and some mathamagiks I'd estimate that puts the wheels at a +7mm offset or so.
A +18 mm offset should be about perfect (5" backspacing on the factory 7.5" wheels)
03-28-2017, 08:37 PM
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UCA isn't the issue with the 2015+ F150s, it's the crash bars slightly in front of the inner fender well.
I ran 2" spacers on my stock wheels on 285/70R17s and at any flex during max turn they would rub. Level ground no rubbing. I would estimate that 1.5" spacers would have no rub, but I haven't measured so am just guessing.
A quick Google search and some mathamagiks I'd estimate that puts the wheels at a +7mm offset or so.
A +18 mm offset should be about perfect (5" backspacing on the factory 7.5" wheels)
I ran 2" spacers on my stock wheels on 285/70R17s and at any flex during max turn they would rub. Level ground no rubbing. I would estimate that 1.5" spacers would have no rub, but I haven't measured so am just guessing.
A quick Google search and some mathamagiks I'd estimate that puts the wheels at a +7mm offset or so.
A +18 mm offset should be about perfect (5" backspacing on the factory 7.5" wheels)
thanks for the reply I appreciate the help. I'm looking at methods and fuel. I'm thinking either 0 offset or +7 that sounds about right I think as to what you're saying
03-29-2017, 12:11 PM
#5
Senior Member
I wanted my wheels out a bit as:
1) I prefer the look better
2) I bought some pocket fender flares I want to install and the factory offset is WAAAAYYY too far inside them to look any good.
03-29-2017, 02:10 PM
#6
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Do you know the specs (width/offset/backspace) of you current (I assume stock?) tires?
If your current wheels are 7.5" wide, then if you went to a 8.5" wide with the same backspacing, then it would stick out the same as adding 1" spacers to your current wheels. If your wheels are a +44mm offset (~6" backspace) like most of the 09-14 stockers, then that would be around a +34mm offset. For a 9" wheel, a +37mm offset (~6.5" backspace) will get the wheel 1" farther out than were it is now.
For an 8.5" wheel, a +7mm offset would put you 1.91" farther out, and a 0 offset would put be almost 2.18" farther out. For a 9" wheel, the +7 will add 2.16" and the 0 will add 2.43". This is with the same width tire. A wider tire will also add to the width increase.
Here's a calculator that will compare different tire/wheel size combos:
https://www.customwheeloffset.com/ti...et-calculators
If your current wheels are 7.5" wide, then if you went to a 8.5" wide with the same backspacing, then it would stick out the same as adding 1" spacers to your current wheels. If your wheels are a +44mm offset (~6" backspace) like most of the 09-14 stockers, then that would be around a +34mm offset. For a 9" wheel, a +37mm offset (~6.5" backspace) will get the wheel 1" farther out than were it is now.
For an 8.5" wheel, a +7mm offset would put you 1.91" farther out, and a 0 offset would put be almost 2.18" farther out. For a 9" wheel, the +7 will add 2.16" and the 0 will add 2.43". This is with the same width tire. A wider tire will also add to the width increase.
Here's a calculator that will compare different tire/wheel size combos:
https://www.customwheeloffset.com/ti...et-calculators
03-29-2017, 09:29 PM
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Do you know the specs (width/offset/backspace) of you current (I assume stock?) tires?
If your current wheels are 7.5" wide, then if you went to a 8.5" wide with the same backspacing, then it would stick out the same as adding 1" spacers to your current wheels. If your wheels are a +44mm offset (~6" backspace) like most of the 09-14 stockers, then that would be around a +34mm offset. For a 9" wheel, a +37mm offset (~6.5" backspace) will get the wheel 1" farther out than were it is now.
For an 8.5" wheel, a +7mm offset would put you 1.91" farther out, and a 0 offset would put be almost 2.18" farther out. For a 9" wheel, the +7 will add 2.16" and the 0 will add 2.43". This is with the same width tire. A wider tire will also add to the width increase.
Here's a calculator that will compare different tire/wheel size combos:
https://www.customwheeloffset.com/ti...et-calculators
If your current wheels are 7.5" wide, then if you went to a 8.5" wide with the same backspacing, then it would stick out the same as adding 1" spacers to your current wheels. If your wheels are a +44mm offset (~6" backspace) like most of the 09-14 stockers, then that would be around a +34mm offset. For a 9" wheel, a +37mm offset (~6.5" backspace) will get the wheel 1" farther out than were it is now.
For an 8.5" wheel, a +7mm offset would put you 1.91" farther out, and a 0 offset would put be almost 2.18" farther out. For a 9" wheel, the +7 will add 2.16" and the 0 will add 2.43". This is with the same width tire. A wider tire will also add to the width increase.
Here's a calculator that will compare different tire/wheel size combos:
https://www.customwheeloffset.com/ti...et-calculators