How to measure a wheel - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**71CHEVYSHORTBED402** · 07-30-2025, 11:37 PM

I dove into this after discovering by initially word of mouth I can't reinstall the 15 x 8 GM rally truck wheels I've had for ages. Good thing I didn't have them refinished, and new tires too, was preparing for it. Dog gone it, I was 50/50 on having dropped it 4/2.5, and after learning that, well I'll just live with it. Not cutting control arms and such....I seem to be on the hunt for 15 x 7 GM now, more or less.

This got me interested to know more about measuring a wheel. There's a TON of information on how, lots of it wrong, some confusion, and some good stuff too. So to understand it better with one picture, I threw this together; boy, I need a hobby retirement is rough

Please tell me if you see something wrong or needs clarification. Sorry it's so big here, the attachment was too small to read.

I see where some measure a "lip" someplace of 1" or so on these wheels, where might that lip be and why is it important, anyone?

Bolt pattern, Height, Width, Backspace and Offset

07-30-2025, 11:37 PM	#1
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,692	How to measure a wheel I dove into this after discovering by initially word of mouth I can't reinstall the 15 x 8 GM rally truck wheels I've had for ages. Good thing I didn't have them refinished, and new tires too, was preparing for it. Dog gone it, I was 50/50 on having dropped it 4/2.5, and after learning that, well I'll just live with it. Not cutting control arms and such....I seem to be on the hunt for 15 x 7 GM now, more or less. This got me interested to know more about measuring a wheel. There's a TON of information on how, lots of it wrong, some confusion, and some good stuff too. So to understand it better with one picture, I threw this together; boy, I need a hobby retirement is rough Please tell me if you see something wrong or needs clarification. Sorry it's so big here, the attachment was too small to read. I see where some measure a "lip" someplace of 1" or so on these wheels, where might that lip be and why is it important, anyone? Bolt pattern, Height, Width, Backspace and Offset Attached Images __________________ Tony 1971 C10 Custom Deluxe SWB 402/400TH A/C I developed an assembly information kit for restoring my truck from nuts and bolts. It's written in Assy. order, short & simple, packed with all OEM hardware ID; castings; part ID; 100s of part numbers; wiring simple - Resource, and trivial too. Much info. applies to all 67-72 GM, A/C vehicles, esp. trucks W/O saying. Full search ability, including to 700+ images of illus., parts, charts, Assy., points of interest, cab, bed, & front clip cart plans- Specials and cores were serviced out and R excluded e.g. front/rear glass, body/paint, engine core, rebuilt hinges, steering box, trans, etc. The project was in-line with long former professions developing process, policy, specs, demo, written for novices, admin., policy, engineers, development, systems & test - Public & govt 2, gross. Sell soft copy cheaply, PM if interested.Build thread:https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 07-31-2025 at 01:06 AM.



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