15x10 back spacing

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Sep 25, 2007 | 11:20 PM

86IROC_Z

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Junior Member

Joined: Sep 2007

Posts: 3

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15x10 back spacing

weld prostars 15x10 what would be the back spacing on a 86 irocz

Sep 26, 2007 | 06:23 AM

1FastZ

Senior Member

Joined: Jul 2001

Posts: 667

Likes: 2

From: Louisville Kentucky U.S.A.

Car: 86 Iroc Z

Engine: 406

Transmission: 350 Turbo

Axle/Gears: 373

Re: 15x10 back spacing

6 inches of back spacing would look great with that 15x10 and about 4 1/2 up front

Sep 26, 2007 | 08:18 AM

AlkyIROC

Moderator

Joined: Jul 1999

Posts: 17,265

Likes: 168

From: 51°N 114°W, 3500'

Car: 87 IROC L98

Engine: 588 Alcohol BBC

Transmission: Powerglide

Axle/Gears: Ford 9"/31 spline spool/4.86

Re: 15x10 back spacing

Typically 15 x 10 rims will use 5.5" of backspace on a third gen providing you're using a third gen diff. If you use a fourth gen diff, 7.5" backspace.

Sep 26, 2007 | 09:35 AM

89importeater

Member

Joined: Sep 2005

Posts: 441

Likes: 0

From: lewisvilee NC

Car: 89 RS camaro

Engine: 454 swap in progress

Transmission: th400

Axle/Gears: 4.11

Re: 15x10 back spacing

sorry not trying yo hijack but what kind of modifications is needed to fit this size wheel and also does anyone have any pics with this setup? if the wheel was bigger lets say a 16-17"x10 would the backspace still be the same?

Sep 26, 2007 | 04:30 PM

greezemonkey

Supreme Member

iTrader: (14)

Joined: Jan 2004

Posts: 1,761

Likes: 4

From: The "D"

Car: A Portly 85 Z28

Engine: 4.530 X 4.250 BBC

Transmission: under rated for this application

Axle/Gears: also under rated

Re: 15x10 back spacing

rim diameter will not change backspace, and since the side wall grows shorter on bigger wheels, clearance should remain the same. I have 15x10 with 5.5 backspace in my sig