Where to find offset? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Triumphrider · 11-30-2013, 03:59 PM

Just wondering where on the rims the offset would be stamped? I picked up my frs and dropped it off at the shop for them to fit some wheels for me. I went with 18x9 but I do not know the offset. They are pretty much flush. Maybe poke just a hair.

Suberman · 11-30-2013, 04:01 PM

Offset, if embossed on the wheel, will generally be on the back of the hub, most likely.

If the wheels are German or Italian they normally have the offset (ET) stamped somewhere on the wheel, often right next to the size.

It isn't required to be though and some wheels just don't have this info.

If the wheel is stripped less using offset is easy. You put a straight edge over the back rim and measure to the hub face where it seats on the car hub. The number in mm is the ET.

You can estimate this even if the tire is mounted by measuring the distance from the inflated sidewall to the hub face and deducting one half of the difference between the section (half of 215 if stock width tire ) and one half of the wheel width (half of 7 inches and 7 inches is 178 mm or half of 8 in your case, 8 in being 203 mm) or, if you can measure the actual sidewall bulge use that. Be aware that specified tire width is approximate so young the 215 number will not yield accurate results.

Triumphrider · 11-30-2013, 09:02 PM

Thanks for the reply... I looked on the back of one of my rims and couldn't see anything. I'll check the others and if nothing measure myself. Thanks again!

mav1178 · 11-30-2013, 09:11 PM

The offset on Japanese wheels are stamped as ET, just like European wheels.

It's often on the back of the center hub.

-alex

Suberman · 11-30-2013, 10:31 PM

Quote:

Originally Posted by mav1178

The offset on Japanese wheels are stamped as ET, just like European wheels.

It's often on the back of the center hub.

-alex

Yes, and often isn't there at all. ET is German 'Einpresstiefe' or "insertion depth" and I think but do not know that TUV standards in Germany require this to be on every German made wheel or wheel offered for sale in Germany.

mav1178 · 12-01-2013, 12:31 PM

On most of the cast wheels I've dealt with (Gram Lights, 5Zigen, Enkei, SSR, etc) the offset is either etched on the backpad of the wheel, or on a sticker on the inside barrel.

Keep in mind we're talking Japanese wheels. I can't say the same for Taiwanese/Chinese/Filipino/Vietnamese/other "JDM" wheels...

-alex

11-30-2013, 03:59 PM	#1
Triumphrider Senior Member Join Date: Oct 2013 Drives: 2013 Scion FRS in white out Location: Cambridge, Ontario, Canada Posts: 261 Thanks: 141 Thanked 102 Times in 64 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Where to find offset? Just wondering where on the rims the offset would be stamped? I picked up my frs and dropped it off at the shop for them to fit some wheels for me. I went with 18x9 but I do not know the offset. They are pretty much flush. Maybe poke just a hair. Attached Images

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11-30-2013, 04:01 PM	#2
Suberman Banned Join Date: Jul 2013 Drives: Subaru BRZ Sport Tech Satin White Location: Calgary, Alberta,Canada Posts: 1,228 Thanks: 147 Thanked 320 Times in 225 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Offset, if embossed on the wheel, will generally be on the back of the hub, most likely. If the wheels are German or Italian they normally have the offset (ET) stamped somewhere on the wheel, often right next to the size. It isn't required to be though and some wheels just don't have this info. If the wheel is stripped less using offset is easy. You put a straight edge over the back rim and measure to the hub face where it seats on the car hub. The number in mm is the ET. You can estimate this even if the tire is mounted by measuring the distance from the inflated sidewall to the hub face and deducting one half of the difference between the section (half of 215 if stock width tire ) and one half of the wheel width (half of 7 inches and 7 inches is 178 mm or half of 8 in your case, 8 in being 203 mm) or, if you can measure the actual sidewall bulge use that. Be aware that specified tire width is approximate so young the 215 number will not yield accurate results.

11-30-2013, 09:02 PM	#3
Triumphrider Senior Member Join Date: Oct 2013 Drives: 2013 Scion FRS in white out Location: Cambridge, Ontario, Canada Posts: 261 Thanks: 141 Thanked 102 Times in 64 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Thanks for the reply... I looked on the back of one of my rims and couldn't see anything. I'll check the others and if nothing measure myself. Thanks again!

11-30-2013, 09:11 PM	#4
mav1178 Senior Member Join Date: Apr 2013 Drives: 2005 Toyota Camry Location: 91745 Posts: 6,562 Thanks: 493 Thanked 6,099 Times in 3,030 Posts Mentioned: 95 Post(s) Tagged: 3 Thread(s)	The offset on Japanese wheels are stamped as ET, just like European wheels. It's often on the back of the center hub. -alex

12-01-2013, 12:31 PM	#6
mav1178 Senior Member Join Date: Apr 2013 Drives: 2005 Toyota Camry Location: 91745 Posts: 6,562 Thanks: 493 Thanked 6,099 Times in 3,030 Posts Mentioned: 95 Post(s) Tagged: 3 Thread(s)	On most of the cast wheels I've dealt with (Gram Lights, 5Zigen, Enkei, SSR, etc) the offset is either etched on the backpad of the wheel, or on a sticker on the inside barrel. Keep in mind we're talking Japanese wheels. I can't say the same for Taiwanese/Chinese/Filipino/Vietnamese/other "JDM" wheels... -alex

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