02-26-2008, 11:18 AM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Quote:
Originally Posted by Jim Holden
So, if the 6" 70 spoke wire wheel (according to Dayton) has a back spacing of 3.25" you would add 1/4" x 2= 1/5" to the track number (52.5" for the rear for example) to get the flange to flange measurement of 53"... Right?
Jim
I feel like I need (as in the old Arlo Gutherie song) 8x12 glossy photos with circles and arrows and a description on the back.
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Start with your math: 1/4" X 2 = 1/2". Because the backspacing is more that 1/2 rim width--hope you accounted for the bead--subtract 1/2" from 52.5" to arrive at a flange-to-flange distance of 52.00"! Your spoke wheel in this case is what was called "laced in" in the old days, so the center of the tires moves in on both sides from the hub flange by 1/4" per side. Simple . . . right? 
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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