I can read different colors too, lol. What doesnt make sense is you list less backspace with coilovers...coilovers should allow you to run MORE bs than a stock spring, right?

 

More BS will put the wheel in closer to the frame of the car. Less puts it away from the frame. Good if you have the room and need to clear the outer fender. Bad when you dont. Keep in mind,.. you can not alter the length of the axle,.. only the wheel.

With coil overs you 'LOSE' space on the inside. To compensate you reduce the BS. Yes this will put the wheel closer to the fender. In a drag application with a 15" wheel and large 28x10.5 tire (275/60) this can become problematic. With low profile tires on larger (Diameter) wheels you have a little more wiggle room. I'll use mine as an example. I can not fit a 17x10.5 6.5" BS rim with a 315/35 tire on my car right now with the rear coil overs. I can how ever fit a 18x10 with 6" BS.

Here is an example.


In this example I have used less BS to create more room on the inside of the wheel (Between the coil overs and wheel) while still retaining the original wheel to fender clearance on the outside. This is what I am trying to explain. Unless you cut an axle and tub the rear,.. there is only so much BS you can use. So with the axle being the stationary point,.. we use the offset/BS of the wheel to get it positioned where we want inside the fender.



Hurst

 

Here is a good shot showing 18x10" wheels with 295 tires on the rear of a fox body. I do not know the BS/Offset,.. was not mentioned in the post that I stole the images from.
But something I did notice. Look at the front hubs. He's still using the fox spindles with a 5 lug hub (Inner/outer bearing set up). Notice the center cap wont fit,.. and probably is just barely keeping the dust cap on.









So it can be done.

Edit:
Is it just me or is TR painfully slow tonight?

Hurst

 

Nice write up as usual pics and all. But you keep comparing a 10.5 with a 6.5 BS to a 10" wheel with a 6" b.s. Bottom line it with all stock Fox Suspension on the reae, you have LESS room with stock spring than with coilovers, With stock sprongs (less room for b.s.), the most backspace on a 10" wheel is 6.5" with a 10.5" tire.
Doing the math, comparing the 2 different widths and and 2 different b.s.'s your moving the b.s. 3/4", thats a lot and and the room isnt there!

 

You dont seem to get it. I havent changed the distance to the outer fender. Only the inside. I keep comparing because thats what I am doing.

Your nuts if you think you have MORE room with coil overs vs stock springs. Tires will hit the inner fender before they hit stock springs. I've run 275/60 tires on 15x8 wheels and they rubbed upper rear portion of the inner fender. Never touched the suspension. When using coil overs in place of the stock shocks you have less room. The tires WILL hit the coil overs before they hit the inner fender with a coil over set up. I provided the pic as proof. I need to reduce,.. not increase BS in order to get the room I need. A 7" BS on a 10" wheel wont work,.. period. You cant even mount it. I mounted a 18x10 6" BS wheel with 285/35 tires and it fit perfectly. Same clearance to the outer fender as when I tried to fit a 17x10.5 wheel with a 315/35 tire,.. but when mounted the tire was on the springs of the coil overs so tightly I could not turn the wheel by hand. They didnt make a 17x10 with 6" BS in the wheel style I wanted,.. only 6.5". I'm not going to be running 15" wheels,.. so it is what it is. I know the typical BS for a 15x10 is 6.5". I'm not running 15" wheels. The tire profile for a 15" wheel it totally different then that for a 17" or 18" wheel. I found something that works and in the process eliminated what didnt.

How do you figure there is less room with stock springs? Where is your logic? Can you not comprehend the diagram I made to explain the difference in backspace? It clearly shows the room created with out putting the wheel and tire into the outside fender.

Maybe this will help you understand BS.



The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up. Take a straight edge and lay it diagonally across the inboard flange of the wheel. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel. This measurement is backspace. The above photo shows three wheels with 2",3", & 4" backspace.


To calculate offset you'll need the following measurements:
[TABLE="width: 100%"]
[TR]
[TD="width: 42"][/TD]
[TD="width: 100%"]Wheel backspace[/TD]
[/TR]
[TR]
[TD="width: 42"][/TD]
[TD="width: 100%"]Wheel Width[/TD]
[/TR]
[TR]
[TD="width: 42"][/TD]
[TD="width: 100%"]Wheel Center line (outboard flange to inboard flange measurement / 2)[/TD]
[/TR]
[/TABLE]
Subtract:

[TABLE="width: 100%"]
[TR]
[TD="width: 42"][/TD]
[TD="width: 100%"]Wheel center line from Wheel backspace to get offset. [TABLE="width: 100%"]
[TR]
[TD="width: 42"][/TD]
[TD="width: 100%"]If backspace is less than the wheel centerline the offset is negative[/TD]
[/TR]
[TR]
[TD="width: 42"][/TD]
[TD="width: 100%"]If backspace is greater than the wheel centerline the offset is positive[/TD]
[/TR]
[/TABLE]
[/TD]
[/TR]
[/TABLE]
Tip:
[TABLE="width: 100%"]
[TR]
[TD="width: 42"][/TD]
[TD="width: 100%"]To convert from inches to mm multiply by 25.4
[/TD]
[/TR]
[TR]
[TD="width: 42"][/TD]
[TD="width: 100%"]To convert from mm to inches divide by 25.4
[/TD]
[/TR]
[/TABLE]




Hurst

 

I'm done here Thomas.
I dont understand why you need to nit pick so much. I explained everything in detail. If I said anything wrong then prove me wrong.


Hurst

 

You mean well, like I said not picking bro....to the OP, dont buy into everything you read on the web

 

ok so bottom line can i run those 10in wheels in the back with that offset?

 

FWIW, Hurstmeister's word is usually gospel, also on the red car, I wonder if those front spindles are lincolns, that setup usually keeps you from running the front hubs

 

A couple places sell 5 lug hubs that work on Fox spindles. Its exactly like the 4 lug hub with inner and outer bearing. Similar to the Lincoln MK hub I suppose. The lack of center caps is what made me notice it. Then you can see he has the smaller brake rotor on there.

They cost about the same as swapping to used SN95 spindle/hubs so to me its not worth the hassle trying to get 5 lug wheels that will clear the fox bearing cap/hub when the SN95 parts work so much better.