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The Tire Rack's Tire & Wheel Forum
Use this forum to discuss anything in relation to wheels to tires to offsets.
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Old 03-27-2009, 03:53 PM   #1
TPRtunerZ26
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Measuring Offset

hey guys,

what is the proper way of measuring the offset of wheels?


While waiting for your responses, i will go search.

Thanks.
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Old 03-27-2009, 05:26 PM   #2
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Here's a nice link to look into.

https://www.rsracing.com/tech-wheel.html
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Old 03-27-2009, 10:52 PM   #3
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haha i already tried that actually and im still not sure about my measurements. Can you get a -39 offset for a 19x8.5 wheel and -40 offset for a 19x9.5 wheel? Because thats what i got. Have you heard something like that?
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Old 03-30-2009, 07:00 AM   #4
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More likely +39 and +40. A "+" offset indicates that the mounting face (the flat surface that contacts the hat of the rotor) is outboard of the centerline of the wheel. A 0 offset means the mounting face is exactly on the centerline of the wheel. A "-" offset means the mounting face is inboard of the centerline.

Since we're on a BMW forum, it's unlikely you have "-" offset wheels, but anything's possible.

However, a +39 mm on a 8.5 and a +40 on a 9.5 are perfectly reasonable, so you might be measuring correctly.

Hope this helps.
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Old 04-16-2009, 09:16 PM   #5
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Originally Posted by VMRWheels View Post
Here's a nice link to look into.

https://www.rsracing.com/tech-wheel.html
I couldn't figure this out myself , my rims are 18" x 9 1/2 width and 3" from the outside of the rim to where the two piece rim bolt together . Can some one PLEASE help me figure this out ? And Also what are the best sizes of tires for this rim ? I would like to get wider tires . Right now I have 225/40/18 all around and was thinking about wider on the back . Any Ideas ????
I appreciate any help .

Thanks, Mike
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Old 04-16-2009, 09:28 PM   #6
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I have a 9.5" width rim and I'm running 255's in the back. They say it's the most aggressive you can have on a sedan factoring in your suspension setup and offset of course. Good luck.
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Old 04-17-2009, 03:22 PM   #7
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Originally Posted by BassRocker View Post
I couldn't figure this out myself , my rims are 18" x 9 1/2 width and 3" from the outside of the rim to where the two piece rim bolt together . Can some one PLEASE help me figure this out ? And Also what are the best sizes of tires for this rim ? I would like to get wider tires . Right now I have 225/40/18 all around and was thinking about wider on the back . Any Ideas ????
I appreciate any help .

Thanks, Mike
Quote:
Originally Posted by M-Spec Tuner View Post
I have a 9.5" width rim and I'm running 255's in the back. They say it's the most aggressive you can have on a sedan factoring in your suspension setup and offset of course. Good luck.
I guess I should have said what car I am driving I'm driving a 2001 325 Ci Convertible with the sport suspension.

Thanks, Mike
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