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-   -   Rim VS Tire Size (http://www.clubcobra.com/forums/all-cobra-talk/115283-rim-vs-tire-size.html)

Scufty 04-19-2012 06:57 PM
Rim VS Tire Size
 
What re your thoughts on this guys...
I currently have 15x10 centerlines with a 4 and 7/8 backspace with 28x10x15 tires MT Sportsman radials

could I go with a 15x8.5 with a 3 and 5/16 backspace with the same tires?

Thoughts?
Anyone running a 28x10 on this rim size?

Scufty 04-22-2012 07:36 PM
nobody else runs 28x10x15 tires?

MaSnaka 04-22-2012 08:46 PM
Scufty, I have 15x8.5 with the MT ET street drag radials 275/60/15 I think the width of your rear end is going to make the back spacing critical. What do you want to kmow that I can help you with? Too bad you not close enough you could try them on for size.
John

DanEC 04-23-2012 11:13 AM
I think a 10 inch thread width tire will work OK on an 8-1/2 rim. The rim width might be a little marginal but not by much.

strictlypersonl 04-23-2012 11:47 AM
You realize that going from 10" x 4-7/8"B.S. to 8.5 x 3-5/16" will move the tread edge out by almost 3/4"?

Gaz64 04-23-2012 02:29 PM
The 8.5 inch rim only comes out an additional 1/16 inch.

392cobra 04-23-2012 02:40 PM
Quote:
Originally Posted by strictlypersonl (Post 1187214)
You realize that going from 10" x 4-7/8"B.S. to 8.5 x 3-5/16" will move the tread edge out by almost 3/4"?
Yep,the rim is 13/16" further outboard with the 8.5 X 3-5/16" B.S.

strictlypersonl 04-23-2012 04:27 PM
Quote:
Originally Posted by Gaz64 (Post 1187230)
The 8.5 inch rim only comes out an additional 1/16 inch.
I wasn't talking about the rim, I was talking about the tire's tread corner, which is approximately the same no matter what the rim width. The centerline of the tread stays with the centerline of the wheel, so the place most likely to rub (the corner of the tread) moves out about 3/4". The widest point of the tire (at the bulge) moves out about half that amount.

xb-60 04-23-2012 04:57 PM
You're spot-on Bob. The outer edge of the rim for both setups is in exactly the same place; the inner rim on the 8.5" wheel is 1.53" further out; that makes the centre of the 8.5" wheel (and hence the centre of the tyre) 0.78" further out, so the outer edge of the (same size) tyre moves out that much as well.
Cheers,
Glen

FWB 04-23-2012 05:45 PM
not relevant to the backspace, but aren't the 15x10 sportsmans 26" not 28?

Gaz64 04-24-2012 03:22 AM
Quote:
Originally Posted by strictlypersonl (Post 1187245)
I wasn't talking about the rim, I was talking about the tire's tread corner, which is approximately the same no matter what the rim width. The centerline of the tread stays with the centerline of the wheel, so the place most likely to rub (the corner of the tread) moves out about 3/4". The widest point of the tire (at the bulge) moves out about half that amount.
Quote:
Originally Posted by xb-60 (Post 1187249)
You're spot-on Bob. The outer edge of the rim for both setups is in exactly the same place; the inner rim on the 8.5" wheel is 1.53" further out; that makes the centre of the 8.5" wheel (and hence the centre of the tyre) 0.78" further out, so the outer edge of the (same size) tyre moves out that much as well.
Cheers,
Glen
Yes boys, you are both near enough correct, sorry for confusion.

Scufty 04-24-2012 09:35 AM
stricklypersonal I think you are mistaken?

the tires I have are 28x10x15 I put them on the 15x8.5 rims with the 3 and 5/16 backspace...the tire does not come out hardly at all on the outside...just comes IN on the backspace. They seem to be working fine. FYI they are also on the front of the car and the previous rim and tires were 15x10 with a 4 and 7/8 backspace. I saw no reason that there would be an issue going to a smaller backspace? So far so good. pretty tight though ( the old set up was very tight as well mind you.
When I put the new rims up againt the old ones the measurement from the lug holes to the front edge of the rim was the same on bot the sets....the backspace is where the inch and a half was made up 10 vs 8.5

Scufty 04-24-2012 09:39 AM
after rereading I guess it all sounds about right ..I will look closer when I get back home again ...seemed ok when I took it for a rip last night ...


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