Need help with offset math please

[Mbrigh3]

So im rocking 20x9 Ram sport wheels with 35x12.5 tires on a leveled Ram and I THINK the offset on these are 19.5mm.

In addition I have 10mm hubcentric spacers and I love how they look push the tire out.. Does the 10mm spacer change my offset to 9.5m which is what I'm currently running?

The reason I'm asking is I'm looking at getting new wheels either 20x9 or 20x10 but I want my tires to stand out just like they are now but no further.... I needed the spacer because the stock tires rubbed my control arm.

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[HDGoose]

I want to learn also.

 

[BOWERSFJ]

Go to rimsntires.com and go to the size comparer ... Plug in your numbers on both sides, and there you have it


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[NOV87]

Yes, your offset is 9.5mm now.
I replaced my OEM rims with offset at 19.5 to aftermarket with -6mm offset. So the tires moved out by 25.5mm. So, a little more than one inch.

 

[crazykid1994]

Remember width plays a big role in the actual offset of the wheel. Not just the 19mm. A 19mm 10 wide and a 19mm 9 wide will not sit the same. It’ll actually sit 1/2” out and in more due to a wider wheel.

 

[Mbrigh3]

Remember width plays a big role in the actual offset of the wheel. Not just the 19mm. A 19mm 10 wide and a 19mm 9 wide will not sit the same. It’ll actually sit 1/2” out and in more due to a wider wheel.

So lets see if im tracking on a 20x10 id be looking close to a 0 offset to get the look i want? That basically like having my current set ip of 20x9 9.5m.

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[crazykid1994]

So lets see if im tracking on a 20x10 id be looking close to a 0 offset to get the look i want? That basically like having my current set ip of 20x9 9.5m.

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Actually you’d need a 10 wide 18-20mm offset your be the same but that’ll probably hit your upper control arm. The less offset the more the tire sticks out. A 10 wide with a 0 offset will stick approximately 1” out more than stock. But my 9 wide -12 offset sticks out approximately 1” more than stock. Other thing you need to be concerned with is backspacing. Stock is 5.5” backspacing which gives you clearance from the back. Hence why you’d hit the upper control arm. Go to customwheeloffset.com and look through their gallery of trucks.

 

[Salty Ram]

Another site to consider is https://tiresize.com/ as you'll be able to throw in all of your current calculations (including the spacer) and you'll get a visual of what the new setup will look like. This site made a difference for me when I was unsure of offset needed for my look.

 

[Mbrigh3]

Phew after all this math I might just stay with my current set up [emoji1787][emoji23][emoji2357]

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[rod from md]

i went w -18 offset 20x10 moto metal wheels and 12.5 35 tires...my width stance is very close to yours

 

[Matt Levitt]

The way I like to remember the offset is this: the farther the negative, the farther out they’ll sit outside the fenders.

I did a 20x10 rim with a -25 offset wrapped in 33’s. Modded my air suspension to lift the front 2” and the rear 1”. That gave me just enough clearance to avoid rubbing, and my auto leveling still works with aero mode and entry mode

 

[ilovemyramlaremie]

Here my set up. 20x10 wheels -19 offset, 285/60/20 Tires, 2.1 Bils leveling. No rubbing, no issues.

 

[Mbrigh3]

i went w -18 offset 20x10 moto metal wheels and 12.5 35 tires...my width stance is very close to yours

Do you have pictures of your set up?



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[rod from md]

sure best i have right now

 

[rod from md]

 

[rod from md]

i also have a 6 inch lift..sorry for the muliple posts thought i fit it in one

 

[xFURIOUSJONESx]

How can I find out the exact offset of the OEM wheels for my truck?


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