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total track width calculation

aintright

NAXJA Forum User
Location
eerie, pa
ok so i've been searching for quite awhile on trying to figure out how to calculate the total track width of an axle... i'm no math whiz but this is how i was trying to figure it out...

(wms to wms) + ((wheel width)-(back spacing)x2) + (extra width of tire)

here is an example of what i'm trying to explain...
77 ford hp44 wms - 66in
wheels - 9in wide
back spacing - 4.5in
tire width - 12.5

12.5 - 9 = 3.5 difference of width from tire to wheel

66 + ((9-4.5)x2) + 3.5 = 78.5in

is this right at all... or am i totally wrong... i'm trying to figure out how much back spacing i'm going to need on wheels

thanks for any help...
 
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