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according to the 944 manual i have:
924S, 944 and 944S had 282.5mm front and 289mm rear
944S2 had optional 304mm fronts and same rear
Turbos up to end of 1988 had 298mm front and 299mm rear.
as of MY88, 951s had 304mm front and 299 rear.
it doesn't list new thickness, but gives wear limits of:
924S, 944 and 944S - 19.1mm and 19.2mm
944S2 - 26.6mm and 22.6mm
Turbos up to end of 1988 - 26.6mm and 22.6mm
as of MY88, 951s - 30.6mm and 22.6mm
BG, you are right on your first statement. i am not sure on the NAs, but in 87, the 951s went to the late arms and the deeper hub depth for ABS option. all of the difference in track width is in the hub and rotor. i have a set of 87 and up rotors on mine and have a spare set of 86 rotors. i can take any measurements you need. let me know.
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