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

Wheel Offset Chart (Easy To Use, Wide Range, covers high positive offsets & wide wheels)

I just finished making this wheel offset chart. I was not satisfied with the information I found online and I wanted something that could be printed out on an 8.5” X 11” sheet of paper and put into an award frame and hung on a shop wall or kept in a folder for quick reference.

http://i292.photobucket.com/albums/m...odyGCarson.jpg

I also wanted one chart that should cover most every custom wheel need from 5.5” to 15” wide and from “deep dish” negative offsets to the very high positive “flush” offsets used in C4, C5 and C6 Corvettes, late model Mustangs and Antique FWD Eldorados and Toronados. I covered wheels with backspacing up to 10” because that is how much clearance is between the wheel mounting surface and the rear spring of the 67 – 70 Eldorado. These high offset numbers will also come in handy for any C5 or C6 Corvette owner who wants to tub the rear end and order custom built three piece forged wheels. I have checked the accuracy of the numbers and all figures are rounded up to the nearest whole millimeter.

This chart is copyrighted, but you are welcome to upload it into your own website, print it out to display in your shop or business, and you may distribute it freely on the web and as a printed hard copy.

Note: when using this chart, keep in mind that it does NOT show tire clearance. That will vary because of tire size options for each wheel. Also: I am not responsible for any miss measurements (or lack of measurements) on your part when ordering custom wheels. This chart is meant to aid in the understanding of wheel offset and to be a general guide in custom wheel selection. If you like it, post a comment. If you find an error or omission, please inform me.

If you have a wheel size not covered in the chart, you can follow the pattern of the wheels already listed, and expand it to fit your needs; just follow the same increments until your wheel is covered.

Cody G. Carson

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??

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 stuff, thanks for sharing. :cheers:

Thanks Cody -

Makes perfect sense.

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

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