Center hole size compatibility SBP/BBP

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slantsixdan

slantsixdan

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Suppose you knock all five lug studs out of a '73-up disc brake rotor (w/4.5" bolt circle). Does a '72-down wheel (w/4" bolt circle) then fit properly over the '73-up rotor? Or is the hub "snout" bigger on the '73-up rotor hub and it won't fit thru the '72-down wheel? Seems like I used to know this, but not'ny more!
 
Thanks, Dave. I don't have any early parts to measure nearby…can anyone else come up with a figure?
 
Some clicking around on Rockauto came up with '73 rotor assy.............
 

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Yes, thanks, but the unanswered part of the question remaining unanswered is the central hole/register size of the pre-1973 wheels.
 
cant believe I'd answer a question for Dan but here goes. No, the center register is much smaller on the early hub/wheel. ( I was thinking of this way back when I had the 64 dart with the late style brakes but found that it would not work, I wanted to use the old wheels and just redrill for bolt pattern). Don't know the actual size of the early register but I could scrounge up an early hub (hope I didn't toss 'em). By the way, sold the car with the 2 different size bolt patterns, large in front, small in rear, haha.
 
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