Wheel Offset Chart (Easy To Use, Wide Range, covers high offsets & wide wheels) - Lateral-g Forums

**GregWeld** · #1 08-30-2009, 02:12 PM

Thank you Cody! I just printed it off and will hang it in my "shed"... for my own personal consumption only.

Just one quick question -- the wheel width and backspace are both in inches -- why is the offset done in MM??

CadVetteStang · #2 08-31-2009, 03:43 AM

Quote:

Originally Posted by GregWeld

Thank you Cody! ..... Just one quick question -- the wheel width and backspace are both in inches -- why is the offset done in MM??

Offset represented in millimeters is pretty much an industry standard. I think they use the millimeters because offset varies so much and with such little amounts. Try expressing 55MM, 56MM, and the difference between the two offsets in fractions of an inch and you get some crazy numbers.

There are wheels that are measured in the metric system. I know some Mustangs of the 80s had metric wheels and it was a pain trying to find tires for them. When I worked at a salvage yard and saw those cars come in, a lot of them had tires measured in inches. So, my guess on why wheels are measured in inches would be due to tire availability and the abundance of cars produced in the American market and for the American market before the metric system became popular in the U.S. ~ but again, that’s just a guess.

Cody

**XcYZ** · #3 08-31-2009, 05:53 AM

Good stuff, thanks for sharing.

**GregWeld** · #4 08-31-2009, 05:55 AM

Thanks Cody -

Makes perfect sense.

Thanks for the effort. This will help me in conjunction with using my Percy's Wheelrite...

JRouche · #5 08-31-2009, 07:13 PM

Quote:

Originally Posted by CadVetteStang

Offset represented in millimeters is pretty much an industry standard. I think they use the millimeters because offset varies so much and with such little amounts. Try expressing 55MM, 56MM, and the difference between the two offsets in fractions of an inch and you get some crazy numbers.

There are wheels that are measured in the metric system. I know some Mustangs of the 80s had metric wheels and it was a pain trying to find tires for them. When I worked at a salvage yard and saw those cars come in, a lot of them had tires measured in inches. So, my guess on why wheels are measured in inches would be due to tire availability and the abundance of cars produced in the American market and for the American market before the metric system became popular in the U.S. ~ but again, that’s just a guess.

Cody

Good bit of info, cool. Funny, tires are still measured in mm. Width. What a crazy world.

JR