any one running 5" backspacing on 9.5 rim - Team Camaro Tech
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post #1 of 9 (permalink) Old Sep 9th, 11, 08:27 PM Thread Starter
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Terry
 
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any one running 5" backspacing on 9.5 rim

I'm looking for a little help before I make a costly mistake , I just ordered a set of ridler 695 18x9.5 for the back with a +6 for offset , so my backspacing will be 5" ? correct and I ordered 275 40s for tires will I have problems with this on the back of my 69 convertible , the place I ordered from assured me these would fit in my wheel well , but after searching here I haven't found any one running this combo . Thanks Terry . So far running stock suspension if that helps with stock drums .
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post #2 of 9 (permalink) Old Sep 9th, 11, 09:02 PM
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Steiner
 
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Re: any one running 5" backspacing on 9.5 rim

+6 offset is 5.5" backspace on a 9.5" rim so you should be OK (-6 is 5"). I run that but on a 17" and 275/40, and I'm pretty sure most people with a 9.5" rim run the same.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #3 of 9 (permalink) Old Sep 9th, 11, 09:34 PM Thread Starter
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Re: any one running 5" backspacing on 9.5 rim

Thanks Steiner , I've been working my self into a ulcer ever sense I ordered these last night .
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post #4 of 9 (permalink) Old Sep 10th, 11, 12:11 AM
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Steiner
 
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Re: any one running 5" backspacing on 9.5 rim

You bet. Usually the ulcer sets in about a week later anyway.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'02 Z/28 vert-stock-sold and totaled
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post #5 of 9 (permalink) Old Sep 10th, 11, 07:17 AM
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Re: any one running 5" backspacing on 9.5 rim

Terry - Steiner is correct you got the right BS for the 9.5" wheel on a '69. Where you will need to be careful is with the 275/40. The 18" version is a full inch taller than the 17" tire. If you have rear disc brakes you'll need to roll or trim the fender lip some and since you have a ragtop you'll want subframe connectors and maybe even a sway bar to counter the body flex. I have 255/45/17's on 9.5 w/5.5bs on my ragtop and they are .6" shorter and .8" narrower in section width than the 275/40/18. With drum brakes the tires only scuffed the inner fender when turning into a driveway. With disc's I had to trim a section of the fender lip and the scuffing was greatly reduced. Coupes get away with this better because the roof adds a lot of structure and the car flexes less when turning into driveways or hard cornering.

Not trying to add to your ulcer, if you are prepared for these issues the stress should be less!

...Dennis

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post #6 of 9 (permalink) Old Sep 10th, 11, 08:28 AM Thread Starter
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Terry
 
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Re: any one running 5" backspacing on 9.5 rim

Thanks also Dennis , I had to sign a disclaimer that if the 275 did not fit I could not send them back , I don't mind making some modifications , but I don't want to cut the car up either , I just looked at my invoice and actually I ordered the 275 35 if that helps , running drums at the moment , but I will be slipping in a 8.8 with discs out of a explorer , I need to see if my exhaust will be a problem .
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post #7 of 9 (permalink) Old Sep 10th, 11, 08:49 AM
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Re: any one running 5" backspacing on 9.5 rim

275/35/18 is 1.1" shorter than the 275/40/18 if that helps any... Both have the same section width.

...Dennis

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post #8 of 9 (permalink) Old Sep 10th, 11, 10:44 PM
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Re: any one running 5" backspacing on 9.5 rim

here you go might want to make it a sticky
Barry
http://www.galantvr4.org/docs/backspacing.htm


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post #9 of 9 (permalink) Old Sep 11th, 11, 08:11 AM
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Re: any one running 5" backspacing on 9.5 rim

Same info different page can be found the first link in the first thread stuck at the top of this forum...

...Dennis

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