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02-25-2008, 11:23 AM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,028
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Not Ranked
Track is the distance from the center of the left tire tread to the center of the right tire tread.
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02-25-2008, 11:35 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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Not Ranked
Further, front and rear track, or tread width, are not necessarily the same. They are not on a Cobra. 
__________________
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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02-25-2008, 11:37 AM
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CC Member
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Join Date: Nov 1999
Location: White Plains,,
NY
Cobra Make, Engine: ERA140, ERA 267, ERA GT2038, ERA FIA 2045, ERAGT2077 ERA2893000EXP
Posts: 1,117
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Not Ranked
So, if for example, you were using six inch rims, you would ad 3+3 to the flange to flange number to arrive at the track number? Or do you have to take into account camber angle as well? But then there's back spacing to be factored in as well, isn't there.
Jim
Last edited by Jim Holden; 02-25-2008 at 11:41 AM..
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02-25-2008, 12:03 PM
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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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Not Ranked
Jim: Track is measured at the center of the wheel level with the ground. It's independent of wheel offset or backpsacing unless you're trying to use the wheels to gain a particular track. Increasing backspacing--moving the wheels in--reduces track and vice versa.
__________________
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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02-25-2008, 01:42 PM
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CC Member
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Join Date: Nov 1999
Location: White Plains,,
NY
Cobra Make, Engine: ERA140, ERA 267, ERA GT2038, ERA FIA 2045, ERAGT2077 ERA2893000EXP
Posts: 1,117
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Not Ranked
Speed220:
I should have been clearer where I was going with this. As I indicated, the orignal small block cars had a track; front 51.5" and rear 52.5" as reported in several magazine articles of the time. Assuming a 6" wheel, I am trying to get to the flange to flange measurement of the original cars and to do that, I have to know the backspacing of the wheels, I would think. As for the various replicas out there, I would think that this measurement could be all over the place given different offsets and different body widths, etc.
Jim
Last edited by Jim Holden; 02-25-2008 at 02:54 PM..
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02-25-2008, 02:57 PM
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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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Not Ranked
Simple enough, Jim.  All you need to know is the tread you're wanting to obtain and the wheel-hub surface measurement from side to side. Subtract the two and divide the result by two. If the desired tread is a bigger number, say 52.5" versus 50.0", the answer would be a positive 2.5". Divided by two, the offset of each wheel from center would be 1.25". With a zero offset wheel, backspacing would be 3.00" with a 6" wheel plus allowance for the bead. But in this case, back spacing would be 3.00" minus 1.25", or 1.75" to set the center of the tires on the ground at zero camber to 52.5" apart, which is track, or tread width. Does this make sense? 
__________________
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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