Therefore, the radius from the center of the axle to the outer edge of a stud is 75 mm (half the diameter), and the 5 studs are placed equal distances from each other along that radius/circle.
no, the distance from the center of the axle to the *center* of a stud is 75mm....
btw, I didn't feel like doing the math so I went out and measured and the distance between "opposing" stud centers was about 142mm so you see that adding 1/2 the thickness of a stud (7mm or so) would be very close to 150mm...
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