US Cartool 3" Spring Relocation Kit

[GrandpaKevin]

Wheel back spacing  is 5.75"

I did some testing of different size wheels spacers to fine tune the fitment and ended up using  .750"

A 1/2" wider tire might fit with the correct backspacing and spacers.

Here is an inside clearance pic with .750" spacers.

[dave73]

Thanks all. What is an acceptable clearance to the quarter lip and spring? I currently have a 275/60 on a 15x8 with 4.5" bs and have a 1/2" to the quarter lip and 1" to the spring.

[dodj]

In my mind, anywhere 1/4" to 3/8" is enough. No science behind that though, just what 'I figure'.
When you go around a corner the tire deflects in the opposite direction that you are turning. But that deflection is centered around the contact patch. Up where the spring is I don't think there is appreciable deflection for it to hit the spring.  That's my figuring.

[HP2]

I've run leaf clearance as tight as .25" and fender lip as tight at .375".  I wouldn't necessarily recommend these as wholesale dimensions as there are other factors to consider like tire type, wheel type, intended usage, road conditions, etc, so on, and so forth.

[gzig5]

Sidewall height is going to have a big bearing as well as driving style.  If you are running 35 series on 18" rims you need less clearance than a 60/70 series on a 15".  If you are just cruising and not doing road course work, you can probably get to within 1/4".