What is Difference Between -18 Offset & OEM Wheels And 1.75" Spacers?

[CarbonSteel]

As noted above, can anyone tell me in inches what the difference between the two may be?

Alternately, which will stick out further?

I am going to replace my OEM Willys wheels and 1.75" spacers with some different wheels and they only come in -18 offset. I am curious as to what difference I can expect between the two:

OEM = 17"x7.5" with Synergy 1.75" spacer
Black Rhino Ark = 17"x8.5"x-18 offset

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[DOOKEY]

Not enough info. What wheel width on the -18mm??

 

[CarbonSteel]

Not enough info. What wheel width on the -18mm??

8.5" vs. 7.5" on the OEM

 

[Chocolate Thunder]

If you have -18 offset wheels you probably don’t need any spacers. As stated, give more info on what you have and what you’re looking to achieve.

 

[CarbonSteel]

If you have -18 offset wheels you probably don’t need any spacers. As stated, give more info on what you have and what you’re looking to achieve.

I am going to replace my OEM Willys wheels and 1.75" spacers with some different wheels and they only come in -18 offset. I am curious as to what difference I can expect between the two:

OEM = 17"x7.5" with Synergy 1.75" spacer
Black Rhino Ark = 17"x8.5"x-18 offset

 

[Chocolate Thunder]

I am going to replace my OEM Willys wheels and 1.75" spacers with some different wheels and they only come in -18 offset. I am curious as to what difference I can expect between the two:

OEM = 17"x7.5" with Synergy 1.75" spacer
Black Rhino Ark = 17"x8.5"x-18 offset

The only missing information is the offset of the OEM Willys wheels. Plug that into this calculator and it’ll tell and show you how one setup compares to the other. I THINK the -18 will be perfectly fine with no spacer, but double check.
https://tiresize.com/wheel-offset-calculator/

 

[blnewt]

I am going to replace my OEM Willys wheels and 1.75" spacers with some different wheels and they only come in -18 offset. I am curious as to what difference I can expect between the two:

OEM = 17"x7.5" with Synergy 1.75" spacer
Black Rhino Ark = 17"x8.5"x-18 offset

I plugged in your current setup on the left (your stock wheel is NOW a zero offset w/ those spacers added) and the -18 wheel on the right column. You're gonna be out a bit over an inch w/ the wider 8.5 -18 set
https://www.wheel-size.com/calc/?wh...17X8.5ET-18&fcl=2in&wcl=1.25in&scl=2in&sr=0in
I forgot you have those 315/70 Kanatis
here's the setup w/ those tires
https://www.wheel-size.com/calc/?wh...17X8.5ET-18&wcl=1.25in&fcl=2in&scl=2in&sr=0in

 

[CarbonSteel]

I plugged in your current setup on the left (your stock wheel is NOW a zero offset w/ those spacers added) and the -18 wheel on the right column. You're gonna be out a bit over an inch w/ the wider 8.5 -18 set
https://www.wheel-size.com/calc/?wh...17X8.5ET-18&fcl=2in&wcl=1.25in&scl=2in&sr=0in

So the -18 offset will stick out an inch more than the OEM +1.75" spacer?

Ouch, guess I need to find another wheel with -12 offset or less

 

[MonopoliJLUR]

The stock offset is +44 so if you’re going to -18 then that’s 62mm right there then another half inch from the extra width (half the additional inch in width since the other half is essentially on the inside of the wheel) then subtract the 1.75 inch spacer you’re using now and all that converted to inches you’re looking at an extra 1.19 inches sticking out

 

[CarbonSteel]

The stock offset is +44 so if you’re going to -18 then that’s 62mm right there then another half inch from the extra width (half the additional inch in width since the other half is essentially on the inside of the wheel) then subtract the 1.75 inch spacer you’re using now and all that converted to inches you’re looking at an extra 1.19 inches sticking out

Thanks for this. I only added spacers to the OEM wheels because the inner wheel would rub on the tie-rod at full lock after I installed some Metal Cloak front end upgrades. MC said it has happened a few times due to variations in FCA's manufacturing.

An additional 1.19" is a little more than I want to have sticking out. It sounds like I need to look at 0 offset or -12 at the most but I would also need to check the clearance on the tie-rod. I tried adding washers under the steering stops, but it was not enough clearance. I guess I could look at installing slightly longer steering stops.

 

[Hucke_250]

Are you happy with how much your current setup sticks out past the fenders? If so, can you measure how much they currently stick out past the fender and let us know? If we know this and the tire size your planning to run, we’ll be able to tell you what width and offset to look for.

 

[CarbonSteel]

Are you happy with how much your current setup sticks out past the fenders? If so, can you measure how much they currently stick out past the fender and let us know? If we know this and the tire size your planning to run, we’ll be able to tell you what width and offset to look for.

Yes; I am and will do. I should have given more "data" in the OP so you guys had more to work with.

 

[DOOKEY]

Yes; I am and will do. I should have given more "data" in the OP so you guys had more to work with.

Try something new moving forward. Quit thinking about offset. Start thinking about back space and front space.

A 9" wide wheel usually measure 1" over the 9" rating from rim to rim.

4.5" back spacing on a 9" wheel = 5.5" front spacing.

That front spacing measurement is what you're after. Compare front spacing from your current wheel to the new wheel and you'll not have to do all the math with offset.

 

[CarbonSteel]

Try something new moving forward. Quit thinking about offset. Start thinking about back space and front space.

A 9" wide wheel usually measure 1" over the 9" rating from rim to rim.

4.5" back spacing on a 9" wheel = 5.5" front spacing.

That front spacing measurement is what you're after. Compare front spacing from your current wheel to the new wheel and you'll not have to do all the math with offset.

Good idea, except I have not seen wheels listed with anything other than offset (at least the ones I have been reviewing), so I am stuck with the math, but all good now that I know what attributes are needed

 

[MonopoliJLUR]

Good idea, except I have not seen wheels listed with anything other than offset (at least the ones I have been reviewing), so I am stuck with the math, but all good now that I know what attributes are needed

it’s because they measure the width from the inside of each lip, so a 9 inch rim will still be an inch bigger than a 8 inch rim

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