Wheel Offset Guide, Unsure about proper offset? Look here first. Options

[WannabeGT4]

Ideal Offset in Relation to Wheel Width (standard ride height):
Width - Offset
7.0"-----30mm with 15mm spacer (effectively 15mm) *
7.5"-----31mm with 10mm spacer (effectively 21mm) *
8.0"-----33mm with 05mm spacer (effectively 28mm) *
8.5"-----35mm
9.0"-----42mm (probably too wide no matter what offset)

This will make the rim almost flush with the side of the body. These offsets and offset/spacer combos will prevent the "sucked in look" that the factory wheels have.

Ideal Offset in Relation to Wheel Width (lower ride height):
Width - Offset
7.0"-----36mm with 10mm spacer (effectively 26mm) *
7.5"-----33mm
8.0"-----40mm
8.5"-----46mm *
9.0"-----53mm (probably too wide no matter what offset)

The rim will sit just behind the fender. In order for the rims to tuck into the fender well on lowered cars the the rim must sit back into the wheel well by 11mm compared to the standard ride height offset recommendations.

* Clearance issues prevent the use of most rims with offsets lower than 30mm. The spacer will actually lower the offset and at the same time move the rim away from the offending components.
* 8.5" rims may or may not fit on lowered cars.

Offsets shown are positive.

Offset is measured from the wheels center line to the mounting surface.


This post has been edited by WannabeGT4: Jan 11, 2006 - 5:18 PM

[tovejas]

so basically the smaller the offset the closer the outter tire wall is to the fenders?

This post has been edited by tovejas: Jan 10, 2006 - 11:08 PM

[WannabeGT4]

so basically the smaller the offset the closer the outter tire wall is to the fenders?

Not exactly. Offset is relative to the wheel's width.
Larger offset means the mounting surface of the rim is further from the wheels center line. This will make the rim sit inside of the fender more, creating that "sucked in look."
Smaller offset means the mounting surface of the rim is closer to the wheels center line. This will make the rim sit closer to the fender but wheel width has to be taken into consideration.

This post has been edited by WannabeGT4: Jan 11, 2006 - 5:23 PM

[jgreening]

This might be for a flush look and it will probably work for the fronts without a problem. I can tell you that if you have a lowered car and do that with the back, you will almost certainly need to roll your fenders. I have 48 offset wheels and 15mm spacers on 7.5" wide rims (effectively +33) and I just BARELY clear the inside of the fender without it rolled (by approximately 1 mm).

[WannabeGT4]

Thanks for the heads up jay. The math I used was based on Slowriders car with an 8.5" wheel with 35mm offset which should be equal to a 7.5" wheel with a 32mm offset and a 10mm spacer. I have no idea however wether or not his car is lowered... Maybe I'll do a revised list for lowered cars tomorrow. I'll use your measurements for a starting point. How far is your car lowered?

[jgreening]

Thanks for the heads up jay. The math I used was based on Slowriders car with an 8.5" wheel with 35mm offset which should be equal to a 7.5" wheel with a 32mm offset and a 10mm spacer. I have no idea however wether or not his car is lowered... Maybe I'll do a revised list for lowered cars tomorrow. I'll use your measurements for a starting point. How far is your car lowered?

Approximately 1.75 inches. I could take a few pics if you want.

By the way, rolling the fenders is not necessarily a bad thing.

And, I think your measurements are probably pretty accurate for a "flush look". I just didn't want people to get the idea that they would be absolutely free from any clearance issues if they used your guide.

[WannabeGT4]

Thanks for the heads up jay. The math I used was based on Slowriders car with an 8.5" wheel with 35mm offset which should be equal to a 7.5" wheel with a 32mm offset and a 10mm spacer. I have no idea however wether or not his car is lowered... Maybe I'll do a revised list for lowered cars tomorrow. I'll use your measurements for a starting point. How far is your car lowered?

Approximately 1.75 inches. I could take a few pics if you want.

By the way, rolling the fenders is not necessarily a bad thing.

And, I think your measurements are probably pretty accurate for a "flush look". I just didn't want people to get the idea that they would be absolutely free from any clearance issues if they used your guide.

If you've got a pic that'd be cool. Is it the rim that's barely clearing or the tire?

[jgreening]

Thanks for the heads up jay. The math I used was based on Slowriders car with an 8.5" wheel with 35mm offset which should be equal to a 7.5" wheel with a 32mm offset and a 10mm spacer. I have no idea however wether or not his car is lowered... Maybe I'll do a revised list for lowered cars tomorrow. I'll use your measurements for a starting point. How far is your car lowered?

Approximately 1.75 inches. I could take a few pics if you want.

By the way, rolling the fenders is not necessarily a bad thing.

And, I think your measurements are probably pretty accurate for a "flush look". I just didn't want people to get the idea that they would be absolutely free from any clearance issues if they used your guide.

If you've got a pic that'd be cool. Is it the rim that's barely clearing or the tire?

I will have to take one for you.

[WannabeGT4]

I added the offsets per wheel width for lowered cars. Would someone like to double check my math? I'm pretty sure it's right but a second opinion would be nice. And if anyone has 8.5" rims on a lowered car would you please chime in and let us know what offset you're running and if you have any clearance issues.

[JoKeRkId613]

This is good stuff. So from my understanding, adding the proper spacers can make your wheels sit flush with the body instead of looking sucked in. My rims are 18x7.5 and the company states they're 35 offset. My celi isn't lowered yet. but on the chart, it says that 7.5" wide rims are 31 offset... so you would need a 10mm spacer to make it look flush. how wide would my spacer need to be if i have 35 offset right now? i plan on dropping it 1.5"all around. i would need 4 spacers, correct? im just making sure this is for both the front and rear. thanks.

[WannabeGT4]

If you plan on lowering it you don't need to do anything. 2mm spacers would be the only thing that would fit and it wouldn't be worth it in my opinion. Honestly, I've never seen wheel spacers smaller than 3mm anyway.

If you're not lowering it you'd need one 14mm spacer for each wheel to get the rim flush with the fender.

This post has been edited by WannabeGT4: Jan 11, 2006 - 9:39 PM

[jgreening]

Justin are you sure that a 40 offset on a 8" rim will clear the strut tower?

[WannabeGT4]

Justin are you sure that a 40 offset on a 8" rim will clear the strut tower?

If not, then 8" rims won't fit at all on a lowered car. +40mm offset on an 8" rim should be as close to the fender as your 7.5" rims with +33 offset which means there is no more room to subtract offset to clear the strut tower.

EDIT: I just checked tirerack and they sell Gram Lights 57pros that are 18x8 +48mm offset for our cars so 8" +40mm offset should fit fine.

This post has been edited by WannabeGT4: Jan 11, 2006 - 9:58 PM

[tovejas]

whats the offset on the stock 15" wheels?

[WannabeGT4]

Most say it's about 37 or 38 for the 15"x7" alloys on the GT.

[JoKeRkId613]

If you plan on lowering it you don't need to do anything. 2mm spacers would be the only thing that would fit and it wouldn't be worth it in my opinion. Honestly, I've never seen wheel spacers smaller than 3mm anyway.

If you're not lowering it you'd need one 14mm spacer for each wheel to get the rim flush with the fender.

ok cool. is this the case with any type of lowering? if i lower it 2", would the same still apply as far as needing a 2mm spacer to be completely flush(i checked and they exist)?

[WannabeGT4]

You won't be able to tell a difference with or without the 2mm spacer.

[CelicaZR]

Sorry to bring up an old thread.
I'm currently looking at these wheels
I like. They are 18 x 7.5 with an offset of +43.
Would this work on my car?

This post has been edited by CelicaZR: Mar 29, 2006 - 5:42 AM

[WannabeGT4]

It'll fit but it will look just as sucked in as the stock wheels. You could run 10-20mm spacers to make it look more flush with the body.

[CelicaZR]

Cool
Thanks Wannabe.
I guess I'll look for another set.