satexas
Well-known member
- First Name
- Russ
- Joined
- Dec 30, 2020
- Threads
- 7
- Messages
- 185
- Reaction score
- 251
- Location
- San Antonio
- Vehicles
- F150 PB 2021 L502a
- Thread starter
- #1
There's a lot of confusion about offsets and tires, and I got some hard answers today that will clear up a LOT of things for most of us. Here's my example and facts :
A Our F150's come with factory (all models) rims set at +44 offset (positive offset moves tire 'towards' hub, away from fender)
B. Factory tires (measuring from tread) start off about 3/4 inside fender itself - this is super-important if you're trying to determine what 'offset' you need to make your new rims and tires flush or 'stick out'. (I measured this on a 2021 f150 myself)
C. Generally accepted terms speaking, "Aggressive" look is about 0.5-1.5 inches sticking out, and "Super Aggressive" is 1.5 inches and up
Real Case Scenario (me)
My rims : Going from factory 20" pvd chrome 8.5" wide to 9" wide RBP 94R Chrome Wheels
Goal : Aggressive look - stick out about an inch. Here's how the math works :
1. New rim is 9" wide, not 8.5", so that's 1/2 in wider - HOWEVER, you must divide that in half because it pushes the rim 1/4 inch inside and 1/4 outside (widens both ways)
So I start off 1/4 inch further out. So with an equal +44 offset rim, I'm sitting 1/4 inch out, still about 1/2 inch inside fender (remember 3/4" default inset explained above)
2. Need to determine offset - my rim comes in many different offsets. If I go +44 offset, I stay at 1/2" inside fender, but I would like to be about 3/4-1" outside for a slightly aggressive look.
So I choose a +0 offset rim. The difference here is going from +44 to +0, which is 44mm, which equals 1.73 inches.
Since after step one I was 1/2 inch INSIDE the fender, this now moves me about 1.25" OUTSIDE the fender - which is rougly my goal.
According to "Trevor" at RimzOne, where I purchased my rims, he says that despite all this math - it' s not perfect science, and that it's always a little more inset than the math says. He says that with going with this 9" rim and 9" wide tire, there's no way I can get close to 2" out - my only fear. He says I'll actually look about 1" out total, my goal. I asked about 2021 trucks having a possible wider default stance than 2015-2020 (unconfirmed) and he says they've done 2021's and yes, what he's saying is accurate and with my choices I will end up 1" out. - my goal. Assures me I won't need to return them if he's wrong - but that of course I can.
What I need to be careful about - I can put up to 12.5" tires on these 9" rims, and that would change the width - another factor... but I'm not, I'm going with 9" nitto ridge grapplers, keeping it around 33" (like factory) on total width, which according to RDP, will be perfect to what I'm after.
Summary : Lot of 'moving parts' in figuring out offsets related to reaching your goal, and one thing hardly mentioned is how far in the original tire starts at - which is about 3/4 inch inside to begin with - so you HAVE to keep that in mind once you start your wheel math. If Ford trucks had a +25 offset, they'd be flush with fender, but they're +44.
Assuming all things flush, here's a calculator that can be handy : https://www.1010tires.com/Tools/Wheel-Offset-Calculator
My Tires : https://www.discounttire.com/buy-tires/nitto-ridge-grappler
My Rims : https://rimzoneonline.com/catalog/p...0x9-rbp-94r-chrome-w/black-inserts-6x135-0mm/
My Tire Choice/Research : I considered Toyo's over Grapplers, but after watching videos and research, I found that the Grapplers last a little longer, ride less noisy, and ride a little smoother than the Toyo's, and the 'look' is about mostly the same. If I was going 4x4 country all the time, I'd give Toya a slight edge. Also a good tire (and even slighly better ride) would be Continental Terrain Contact A/T tires, and Continentals are about $50/tire cheaper.
A Our F150's come with factory (all models) rims set at +44 offset (positive offset moves tire 'towards' hub, away from fender)
B. Factory tires (measuring from tread) start off about 3/4 inside fender itself - this is super-important if you're trying to determine what 'offset' you need to make your new rims and tires flush or 'stick out'. (I measured this on a 2021 f150 myself)
C. Generally accepted terms speaking, "Aggressive" look is about 0.5-1.5 inches sticking out, and "Super Aggressive" is 1.5 inches and up
Real Case Scenario (me)
My rims : Going from factory 20" pvd chrome 8.5" wide to 9" wide RBP 94R Chrome Wheels
Goal : Aggressive look - stick out about an inch. Here's how the math works :
1. New rim is 9" wide, not 8.5", so that's 1/2 in wider - HOWEVER, you must divide that in half because it pushes the rim 1/4 inch inside and 1/4 outside (widens both ways)
So I start off 1/4 inch further out. So with an equal +44 offset rim, I'm sitting 1/4 inch out, still about 1/2 inch inside fender (remember 3/4" default inset explained above)
2. Need to determine offset - my rim comes in many different offsets. If I go +44 offset, I stay at 1/2" inside fender, but I would like to be about 3/4-1" outside for a slightly aggressive look.
So I choose a +0 offset rim. The difference here is going from +44 to +0, which is 44mm, which equals 1.73 inches.
Since after step one I was 1/2 inch INSIDE the fender, this now moves me about 1.25" OUTSIDE the fender - which is rougly my goal.
According to "Trevor" at RimzOne, where I purchased my rims, he says that despite all this math - it' s not perfect science, and that it's always a little more inset than the math says. He says that with going with this 9" rim and 9" wide tire, there's no way I can get close to 2" out - my only fear. He says I'll actually look about 1" out total, my goal. I asked about 2021 trucks having a possible wider default stance than 2015-2020 (unconfirmed) and he says they've done 2021's and yes, what he's saying is accurate and with my choices I will end up 1" out. - my goal. Assures me I won't need to return them if he's wrong - but that of course I can.
What I need to be careful about - I can put up to 12.5" tires on these 9" rims, and that would change the width - another factor... but I'm not, I'm going with 9" nitto ridge grapplers, keeping it around 33" (like factory) on total width, which according to RDP, will be perfect to what I'm after.
Summary : Lot of 'moving parts' in figuring out offsets related to reaching your goal, and one thing hardly mentioned is how far in the original tire starts at - which is about 3/4 inch inside to begin with - so you HAVE to keep that in mind once you start your wheel math. If Ford trucks had a +25 offset, they'd be flush with fender, but they're +44.
Assuming all things flush, here's a calculator that can be handy : https://www.1010tires.com/Tools/Wheel-Offset-Calculator
My Tires : https://www.discounttire.com/buy-tires/nitto-ridge-grappler
My Rims : https://rimzoneonline.com/catalog/p...0x9-rbp-94r-chrome-w/black-inserts-6x135-0mm/
My Tire Choice/Research : I considered Toyo's over Grapplers, but after watching videos and research, I found that the Grapplers last a little longer, ride less noisy, and ride a little smoother than the Toyo's, and the 'look' is about mostly the same. If I was going 4x4 country all the time, I'd give Toya a slight edge. Also a good tire (and even slighly better ride) would be Continental Terrain Contact A/T tires, and Continentals are about $50/tire cheaper.
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