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Thread: Backspacing - Drum vs. Disc
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04-27-2010 #1
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Backspacing - Drum vs. Disc
I'm planning on running 18's on my Skylark, 18 x 8 w/ 245/45/18 front and 18 x 9.5 w/ 275/40/18 rear (already have the tires). The car currently has 4 wheel drums which I plan to upgrade to 4 wheel disc. Obviously the stock little 14" wheels won't fit over 13" or 12" discs so I'll need to purchase the wheels first. How much difference in backspacing is there between the drums and something like either 4th gen camaro brakes or aftermarket Wilwoods? Enough to worry about or should I be okay running like 4.5" backspacing up front & 5" in the rear for both applications?
Ed Cooney
'96 Buick Roadmaster Estate Wagon, LT1/4L60, full bolt-ons & Solomon's tune, 18" Ridler wheels, lowered with Belltech springs
‘70 Buick Skylark Convertible project w/ GN drivetrain
'91 Formula, pending track day build
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04-27-2010 #2
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Discs will widen your track about 1/4-3/8"...
'67 Buick Skylark GS400 funny car "Ingenue" 8/10 HRM / Gasoline (Swedish) cover & feature 2/12
World's only Buick-powered Buick Funny Car!
Used to be known as musclecarjohn
www.buickfunnycar.com
http://www.facebook.com/ingenuebuickfunnycar
04-28-2010 #3
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Does that backspacing sound right?
Ed Cooney
'96 Buick Roadmaster Estate Wagon, LT1/4L60, full bolt-ons & Solomon's tune, 18" Ridler wheels, lowered with Belltech springs
‘70 Buick Skylark Convertible project w/ GN drivetrain
'91 Formula, pending track day build
04-29-2010 #4
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4.5" in front sounds about right,5.5" on the rears will probably work better than 5".
Originally Posted by ed1le
'67 Buick Skylark GS400 funny car "Ingenue" 8/10 HRM / Gasoline (Swedish) cover & feature 2/12
World's only Buick-powered Buick Funny Car!
Used to be known as musclecarjohn
www.buickfunnycar.com
http://www.facebook.com/ingenuebuickfunnycar
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