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Tire size and wheel size

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G3GM :: G3 Tech :: Chassis and Suspension

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Tire size and wheel size Empty Tire size and wheel size

Post by gmc truck09 Tue Sep 25, 2012 2:10 pm

Hello everyone,
I need some serious help.
I am restoring a 75 elcamino{dads}.
I plan on going old ss cragers, also would like to have a little rake.
I dont know what kind of backspacing i need, and whats going to look good
Any recommendations for a setup. definately want wider in back.
Thanks in advance.
this is a pain in the?

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Post by JB2wheeler Tue Sep 25, 2012 8:15 pm

I am running 17x8 wheels with 235-55-17 tires on my 74 Elky and love the 17 inch wheels. If I had it to do over I would get 17x10 inch wheels with a wider tire for the back only. Most people here use the 15x10 inch wheels on the back. I love my 17s. JB
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Post by BlackChevelleSS Tue Sep 25, 2012 8:25 pm

you start with 15x7 and 4" back spacing and add half inch of BS for every inch of width. so 15x8 is 4.5"
15x9 is 5"
15x10 is 5.5"

This is to get the rear to tuck up and wheel wheel centered in wheel well. Every car is different but this is the best method to get close.


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Post by 77ElClassic Tue Sep 25, 2012 10:25 pm

I'm running 15 X 10 on the back of my 77 Elky. With the 295-50 tires and a 5" back space. Everything clears nicely.
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Post by gmc truck09 Fri Sep 28, 2012 7:10 am

Thanks for your help, Can anyone explain or define offset vs back spacing.

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Post by 77mali Fri Sep 28, 2012 7:40 am

http://www.g3gm.com/t5472-how-to-measure-bolt-pattern-rim-size-backspacing-and-more

Offset & backspace are the same thing
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Post by JB2wheeler Fri Sep 28, 2012 1:07 pm

77mali wrote:http://www.g3gm.com/t5472-how-to-measure-bolt-pattern-rim-size-backspacing-and-more

Offset & backspace are the same thing
Sorry, I don't think so. JB https://www.rsracing.com/tech-wheel.html
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Post by 77mali Fri Sep 28, 2012 4:37 pm

I guess you learn something new everyday. Thanks for the link.
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