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#1
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Back spacing
Can someone tell me the back spacing on the 15x8 snowflake rim....thanks
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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's |
#2
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They are zero offset which equates to 4 1/2" backspace.
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Bob Woodard Brighton, MI 2012 SRT8 Charger - 12.70 @ 111mph |
#3
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offset & Back spacing.
I am confused. Isn't 0 offset on an 8" rim 4" of BS? Please explain.
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Own many Olds including 1972 442 W-30 (last 4 speed W-30 built); 1970 Cutlass W-31 #s match auto 3.91s; 1965 442 461 cid BBO & Richmond 5 speed; 1987 442 with 470 cid SBO 11.37 @ 119.4; 1972 442 524 cid BBO race car 10.89 @ 122.5; 1973 442 350 automatic black & white; 1980 GMC 468 cid BBO powered. Past owner of an original paint 1973 Esprit. Looking for the keeper 1970-1974 Pontiac F body. |
#4
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An 8" rim measures 9" from lip to lip.
Backspacing is measured from the rear rim lip, hence the 4.5" backspace measurement.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#5
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offset
Thanks. Silly me assumed that an 8" rim was 8" wide & 0 offset was half at 4".
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Own many Olds including 1972 442 W-30 (last 4 speed W-30 built); 1970 Cutlass W-31 #s match auto 3.91s; 1965 442 461 cid BBO & Richmond 5 speed; 1987 442 with 470 cid SBO 11.37 @ 119.4; 1972 442 524 cid BBO race car 10.89 @ 122.5; 1973 442 350 automatic black & white; 1980 GMC 468 cid BBO powered. Past owner of an original paint 1973 Esprit. Looking for the keeper 1970-1974 Pontiac F body. |
#6
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Honest mistake. The 8" measurement is taken where the tire meets the bead, not overall wheel width. I admit that it is confusing.
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Bob Woodard Brighton, MI 2012 SRT8 Charger - 12.70 @ 111mph |
#7
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Ok thanks
I'm looking at a set of rims with 3 1/2 back space 15 x 8 rims I want to mount some 275/60/15 drag radials to some rims but I don't think the 3 1/2 back space is gonna work any thoughts I think the 3 1/2 will push the wheel to far out to the wheel lip...
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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's |
#8
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I agree that it sounds risky. That's pushing the wheel outboard a full inch.
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Bob Woodard Brighton, MI 2012 SRT8 Charger - 12.70 @ 111mph |
#9
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255 60 15
If you don't already own the 275 60 15s the 255 60 15s work well & might leave you enough room to make that wheel back spacing work. I have 60' a best of 1.52 sec on a 255 60 15 drag radial on my G body with more power than you are making.
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Own many Olds including 1972 442 W-30 (last 4 speed W-30 built); 1970 Cutlass W-31 #s match auto 3.91s; 1965 442 461 cid BBO & Richmond 5 speed; 1987 442 with 470 cid SBO 11.37 @ 119.4; 1972 442 524 cid BBO race car 10.89 @ 122.5; 1973 442 350 automatic black & white; 1980 GMC 468 cid BBO powered. Past owner of an original paint 1973 Esprit. Looking for the keeper 1970-1974 Pontiac F body. |
#10
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Hmmm that's some good info oldsmobiledave,...thanks Chris
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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's |
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