+18 offset *help please* - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 09-28-2011, 06:25 PM Thread Starter
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+18 offset *help please*

When it comes to wheels, im completely lost. I am looking to run 37x12.50x20 tires on a 6 inch lift. I realize that the wheel plays an important role on if it will rub or not. The rims I am looking at are 20x9. Here is what the listing says.
Size
20 x 9
Offset
+18
Part Number
HE835
BACKSPACE
5.71"
Finish
GLOSS BLACK

Will these rub running 37x12.50?


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20x10 machinedFuel Hostage rims
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post #2 of 9 Old 09-28-2011, 07:50 PM
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You sure about the +18? A positive offset has the wheels mounting plate closer to the outside of the wheel. This puts the wheel more tucked under the vehicle. Whereas a negative offset will shift the mounting plate closer to the inside of the wheel, moving the wheel our from under the vehicle.

I suspect you could end up really close to rubbing, but not sure. Maybe someone with a wheel that size will chime in.

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post #3 of 9 Old 09-28-2011, 07:53 PM
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On a 9" wide wheel, you want -12mm offset (4.5" backspacing), and on a 10" wide wheel you want -24mm offset (4.5" backspacing).

Offset and backspacing are directly related..

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post #4 of 9 Old 09-28-2011, 08:23 PM Thread Starter
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Thanks for clearing the offset up. The eBay listing says it has a 5.71" backspace. Would that make it a -18 offset? Im sure they could easily have put in the wrong offset. I haven't been able to find any with a 4.5" backspace. Closest I have found is 5.0. Would that be very prone to rubbing? That was also on a 20x9 rim.


2006 F-250 Lariat
Super Cab short bed
20% tint
20" LED light bar
Diamond eye 5" straight pipe
River City Diesel EGR delete
ARP head studs w/ OEM gaskets
Blue spring
SCT X3 xtreme street
Edge Insight CTS
Mag Hytec diff cover
7 inch Icon lift
20x10 machinedFuel Hostage rims
37x13.50x20 Toyo Open Country M/T
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post #5 of 9 Old 09-28-2011, 09:11 PM
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A 9in wheel with 0 offset would have a backspace of 5in. Anything greater then 5 will be a positive offset and anything less then 5 would be a negative offset. So if that wheel has a 5.71 offset, you can multiple 25.4 x .71 to figure out what the offset would be.

In other words,
5.71 - 5 = .71
25.4 x .71 = 18

So the numbers are correct for the original rim

On the new rim, if it has a 5in backspace, this would equate to a 0 offset. That's better then the previous wheel. What I don't know is whether that will clear with your year truck. I'm guessing SickStroker above has it right though with the recommendation of -12 offset or 4.5 backspace.

Shaun

'08 F250 6.4L Lariat 4x4 CC/SRW fully loaded, special ordered
6" Fabtech 2.25 dual shock lift w/18" AR wheels, 35" Toyo AT's
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(2) Rear headrest mnt DVD entertainment systems
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post #6 of 9 Old 09-29-2011, 10:08 AM
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Smotrs is correct, You're going to want a wheel that has a 4.5" BS. Not all wheels list their backspace. Commonly, a 20x9 with a -12mm offset has a 4.5"BS.

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post #7 of 9 Old 09-29-2011, 01:35 PM
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I am not running 20's I have 17x9 with 4.5 back space with 37x13.50 and dont rub at full lock.

2005 F350 Crew Cab Lariat 4x4 Dually.. My new Fat Bottom!!! SCT SF3, blue spring upgrade and Straight Piped! Studded and deleted, custom tuning hopefully coming! 22.5 American Force Independance wheels!
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post #8 of 9 Old 09-29-2011, 05:14 PM Thread Starter
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Alright thanks for the input guys. I think I found the rims I want to get. Only thing is that in order to get the 4.5 backspacing I have to get 20x10s. These wouldnt rub would they? I would probably run a 13.50 instead of a 12.50 tire.


2006 F-250 Lariat
Super Cab short bed
20% tint
20" LED light bar
Diamond eye 5" straight pipe
River City Diesel EGR delete
ARP head studs w/ OEM gaskets
Blue spring
SCT X3 xtreme street
Edge Insight CTS
Mag Hytec diff cover
7 inch Icon lift
20x10 machinedFuel Hostage rims
37x13.50x20 Toyo Open Country M/T
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post #9 of 9 Old 09-30-2011, 02:07 AM
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Not sure if the 10's would rub, but I will tell you that the 13.50 looks alot better than a 12.50. I just switched and cant believe the differance!!!

2005 F350 Crew Cab Lariat 4x4 Dually.. My new Fat Bottom!!! SCT SF3, blue spring upgrade and Straight Piped! Studded and deleted, custom tuning hopefully coming! 22.5 American Force Independance wheels!
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