Help me understand Backspacing vs Offset
Thread Starter
Joined: Nov 2006
Posts: 707
Likes: 1
From: Right across the river from Huntington, WV
Help me understand Backspacing vs Offset Is it basically an expression of the same thing?
I have a really nice set of Speedline Corse 2308's I want to use on my ws6, but i cant figure out if they'll work or not.
Will a 17x8.5 with 4 7/8" backspacing fit on the front?
How about a 17x10 with 6 1/4" backspacing on the rear?
These are originally for a BMW fitment. Basically the same bolt pattern as ours though.
Do you think I'd be able to use a 315 tire in the back okay?
I have a really nice set of Speedline Corse 2308's I want to use on my ws6, but i cant figure out if they'll work or not.
Will a 17x8.5 with 4 7/8" backspacing fit on the front?
How about a 17x10 with 6 1/4" backspacing on the rear?
These are originally for a BMW fitment. Basically the same bolt pattern as ours though.
Do you think I'd be able to use a 315 tire in the back okay?
They will not work. Both will stick out to much. On the rear you'll be at about +32mm. A 315 is to big to run safe on a 10" rim.
If you have them already why not just bolt them in and see for yourself.
If you have them already why not just bolt them in and see for yourself.
Thread Starter
Joined: Nov 2006
Posts: 707
Likes: 1
From: Right across the river from Huntington, WV
I fit them on w/o tires and it looked really close. Tires tell a different story though. I don't want to have tires mounted to them and they not fit. Then I go from rims I can get my money back out of to $500 rims because they were "mounted".
If you did try to fit them then you would have easily noticed that the front will not fit... it comes to roughly +15mm when you need at least +38mm on these.
Offset and back spacing are related, but one cannot really be determined exactly by knowing one or the other . . . you can guesstimate . . .
Lets do the math on the 8.5" wide wheel. I am going to assume the rim beads are 1/2" thick making the wheel physically 9.5" tall over all width. (FYI rim size is measured from the inside surfaces of the rim beads).
9.5" - 4.875" BS = 4.625"
9.5" / 2 = 4.75"
Presumed offset: 4.75"-4.625" = .125" or 3.175 mm . . . and no that will not fit.
Lets do the math on the 8.5" wide wheel. I am going to assume the rim beads are 1/2" thick making the wheel physically 9.5" tall over all width. (FYI rim size is measured from the inside surfaces of the rim beads).
9.5" - 4.875" BS = 4.625"
9.5" / 2 = 4.75"
Presumed offset: 4.75"-4.625" = .125" or 3.175 mm . . . and no that will not fit.
Trending Topics
Thread Starter
Joined: Nov 2006
Posts: 707
Likes: 1
From: Right across the river from Huntington, WV
Thanks man. That's a bummer....these rims look sweet!
Know anyone with a bimmer or 3rd gen f-body looking for a set of wheels?
I know it fits those.
Know anyone with a bimmer or 3rd gen f-body looking for a set of wheels?
I know it fits those.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
If you have a wheel with too big of and offset then a spacer will help.
