How much BackSpace is possible?
Melting Slicks
Joined: Jul 2005
Posts: 2,545
Likes: 3
From: 406ci SB, AFR 180 Heads - 490 HP @5,600 RPM 529 lb-ft @ 4,100 RPM
I see you have a chrome bumper car, I have 4.5 BS on our 79 with 8.5 wide rims with no issues on stock trailing arms. Now the front might be an issue with rubbing with full turn on your bumper car. 
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Hallo Guenther!
Ich glaube das mit der originalen radaufhaengung, wuerde ich sagen das Du hinten 4.5 " backspacing und vorne 4 " backspacing verwenden kannst.
Uebrigens, schoene Gruesse nach Oesterreich! Ich bin gebuertiger Oesterreicher, bin allerdings schon 12 Jahre in Florida und inzwischen Amerikaner!!
Ich glaube das mit der originalen radaufhaengung, wuerde ich sagen das Du hinten 4.5 " backspacing und vorne 4 " backspacing verwenden kannst.
Uebrigens, schoene Gruesse nach Oesterreich! Ich bin gebuertiger Oesterreicher, bin allerdings schon 12 Jahre in Florida und inzwischen Amerikaner!!
Drifting
Joined: Oct 2005
Posts: 1,528
Likes: 148
From: East London/SW Essex UK
On '68 I have 5" backspace on rear with 18 X 9 rims and stock trailing arms. With 285/40/18 it gets very close but dosen't touch - parking brake cable is another matter. Front is 4" backspace and 18 x 8 rim with 245/45/18 - contact issues here! driver side, tyre slightly on inside of chassis rail - passenger side bottom rear of fender opening, this on my car needed sectioning for clearance!
Drifting
Joined: Jun 2007
Posts: 1,927
Likes: 0
Hallo Guenther!
Ich glaube das mit der originalen radaufhaengung, wuerde ich sagen das Du hinten 4.5 " backspacing und vorne 4 " backspacing verwenden kannst.
Uebrigens, schoene Gruesse nach Oesterreich! Ich bin gebuertiger Oesterreicher, bin allerdings schon 12 Jahre in Florida und inzwischen Amerikaner!!
Ich glaube das mit der originalen radaufhaengung, wuerde ich sagen das Du hinten 4.5 " backspacing und vorne 4 " backspacing verwenden kannst.
Uebrigens, schoene Gruesse nach Oesterreich! Ich bin gebuertiger Oesterreicher, bin allerdings schon 12 Jahre in Florida und inzwischen Amerikaner!!
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Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
CF'er Bee Jay has just put a set of 295/35's & 18 x 10.5's C5 Z06 wheels on his C3 w/2.5" adapters, but he's getting some 2" adapters, as they're likely to hit the outer fender opening as they are. If it works, and my calculations are correct, that works out to 5.9" BS. 
FWIW, he does have offset TA's.
http://forums.corvetteforum.com/c3-t...ls-are-on.html
TSW
FWIW, he does have offset TA's.http://forums.corvetteforum.com/c3-t...ls-are-on.html
TSW
Last edited by TheSkunkWorks; Mar 20, 2009 at 08:18 PM.
Race Director
Joined: Jan 2007
Posts: 14,959
Likes: 3,353
From: NYC NY
I'm pretty sure that past 5.5" of backspace with 18" wheels in the rear the frame becomes the limiting factor not the trailing arm. Check with Gordonm on that one to be sure. In the front with VB&P tubular arms for the mono spring set up you can get away with 4.5" of backspace. I know that's what Chris McDonald was running on his black '69 vert "Killer Shark".
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I've got 5 inch on my 18's and the wheel and tire are just flush with fender with 9.5" rim. I believe you can fit 5.5 inch but that might change from year to year or Vette to Vette 
