# Help from the wheel/tire guys, please..

**URL:** <https://forums.speedlife.net/t/help-from-the-wheel-tire-guys-please/264535>\
**Category:** Shift518 Automotive\
**Created:** [July 28, 2012, 4:54pm UTC](https://forums.speedlife.net/t/help-from-the-wheel-tire-guys-please/264535 "2012-07-28T16:54:18Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![TurboTravis](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/turbotravis/32/6406_2.png) [@TurboTravis](https://forums.speedlife.net/u/TurboTravis)\
**Post date:** [July 29, 2012, 3:11pm UTC](https://forums.speedlife.net/t/help-from-the-wheel-tire-guys-please/264535/9 "2012-07-29T15:11:32Z")

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> [@520 conversion and sprockets...questions](https://forums.speedlife.net/t/520-conversion-and-sprockets-questions/50289/28):
>
> What size are the current rear wheels? You said a 4" backspacing, so that makes things easier.
> 
> Essentially, say you have two wheels, both the same width as your current wheel:
> 
> The 3.5" backspaced wheel (compared to your current wheel) will make it so the wheel sticks out further towards the fender. It’ll have more of a “dish” on the face of the wheel.  
> The 4.5" backspaced wheel (compared to your current wheel) will make it so the wheel moves inward, closer to suspension components.
> 
> I’d say get the car in the air, and then see if you have another .5-1" space available on the inside to clear any suspension components. Also see if you have the .5-1" on the outside to clear the fender. If both clear fine, and the new wheel is the same width as your current wheel, you can go with whatever you desire for looks.
> 
> Sorry if that’s confusing, I’m no expert, but that’s what I know.

> [@Gas mileage thread](https://forums.speedlife.net/t/gas-mileage-thread/50164/83):
>
> Your running a 8" wide wheel right now correct? If so measure the clearance on either side of the wheel vs the outer fender lip and the inner well and suspension components. If your stuck with the current 4" BS then then 4.5 wheel with a half inch spacer would put you back where you are now. If that makes any sense.

Makes sense.

I looked at it this AM, and I can’t go with anything less than the current 4" backspacing. So I guess it’s a 4.5" backspace with a 1/2" spacer.

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