rim backspace
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Junior Member
Joined: Jul 2003
Posts: 58
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From: Cocoa,Fl.
Car: 92 Camaro z28
Engine: 427 sb
Transmission: th400
Axle/Gears: 9"/4.30
rim backspace
I have a moser 9" stock lenght. Im getting 15x10 rim with 295 radial tire. What backspacing would I need to use to have the tires tuck inside the fender? Thanks, Ronnie
Joined: Jun 2002
Posts: 13,576
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From: Harford County, MD
Car: camaro sportcoupe
Engine: 7.0L
Transmission: G-Force GF5R
Axle/Gears: Moser 9"
Re: rim backspace
not on a 15x10 wheel. the 5.5" backspacing will get it right at or slightly under the fender lip, most people are going to a 6.5" backspacing and it tucks the tires nicely, but inner fender modifications are needed (hehe, get out the BFH!)
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Joined: Jul 1999
Posts: 17,271
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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: rim backspace
I second the 5.5" with a 10" rim. I ran 29.5 x 10.5 slicks on them and they tucked under the fenders nicely however the tire height required some inner fender modifications. A shorter, more common 26" tall tire doesn't have those issues.
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Joined: Jan 2007
Posts: 414
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From: RI
Car: 87 Firebird Formula
Engine: AFR headed SBC
Transmission: TKO 600
Axle/Gears: 9" Moser with 4.11's
Re: rim backspace
Also if you go the 15x10 with 6.5 BS to tuck them more there will be modifications to the inner fenders as stated but some people are saying you need offset lower control arms as well. Im not sure if it is a must or not but I believe so.
Joined: Jun 2002
Posts: 13,576
Likes: 30
From: Harford County, MD
Car: camaro sportcoupe
Engine: 7.0L
Transmission: G-Force GF5R
Axle/Gears: Moser 9"
Re: rim backspace
i think that really depends on tire size...i believe radialtireking is running a 295/65/15 on a 15x10 with 6.5" backspacing with minimal work and regular tubular lca's...xpndbl3 is also running the same backspacing with regular style lca's as well...
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Joined: Nov 2004
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From: stuart fl
Car: 82 camaro
Engine: 434 ci
Transmission: t400
Axle/Gears: 9'' 4.10 gear
Re: rim backspace
6.5 back spacing and I found my air hammer to work the best at reshaping the inner wheel well you will also need tubular lower controll arms.
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iTrader: (5)
Joined: Jan 2002
Posts: 13,622
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From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: rim backspace
no I have rod ended everything in my suspension all chro moly tubular with offset bushings on the LCAs. For the size tire I'm running I definitely needed the offset.
Joined: Jun 2002
Posts: 13,576
Likes: 30
From: Harford County, MD
Car: camaro sportcoupe
Engine: 7.0L
Transmission: G-Force GF5R
Axle/Gears: Moser 9"
Re: rim backspace
to the OP: make sure you listen to these guys...i'm running a small tire on a 15x10 with 6.5" backspacing (just a 275/60) so i got away with alot less problems than the guys running the 12" wide tires.
Last edited by mw66nova; Jan 5, 2009 at 10:53 AM.
Joined: Jun 2001
Posts: 8,028
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From: DC Metro Area
Car: 87TA 87Form 71Mach1 93FleetWB 04Cum
Re: rim backspace
on a 10" wide wheel, 6" of backspacing will locate the tire approximately where a stock 15 wheel does, 6.5" will put it a 1/2" further in, 5.5" will put it a 1/2" further out. The problem is finding a 6" backspacing.
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