Back Spacing calculation - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bowtie67 · 02-12-2006, 06:36 PM

I am not 100% sure and want to be before I order my new rear rims, There will be wheel tubs so inner dimensions not an issue. Frame width is 34"

My outside measurement inbetween the rear fenders (stepside) is 73.25"

Axle width drum to drum is just under 55"

Rims will be 12" wide Tires are 15" wide

73.25 - 2.25 (rounded off) space btween tire & fender = 71" (1 1/8 per side)

71" - 55" = 16 / 2= 8 would mean a 4" BS
4" + 1.5 = 5.5 BS (1.5 is for tire over hang)

Anyone else come up with anything ??

02-12-2006, 06:36 PM	#1
Bowtie67 Registered User Join Date: Jan 2004 Location: NH Posts: 2,266	Back Spacing calculation I am not 100% sure and want to be before I order my new rear rims, There will be wheel tubs so inner dimensions not an issue. Frame width is 34" My outside measurement inbetween the rear fenders (stepside) is 73.25" Axle width drum to drum is just under 55" Rims will be 12" wide Tires are 15" wide 73.25 - 2.25 (rounded off) space btween tire & fender = 71" (1 1/8 per side) 71" - 55" = 16 / 2= 8 would mean a 4" BS 4" + 1.5 = 5.5 BS (1.5 is for tire over hang) Anyone else come up with anything ?? __________________ 1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them"



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