With a standard of 1g of gravity at the wheel, the rotation speed per 1 revolution computed as a function of station size along with how fast the wheel is moving linearly around the hub.

Station Size	Time for 1 Revolution	Wheel Velocity
1	19.87 sec	31.62 m/s
2	24.18 sec	44.72 m/s
3	34.41 sec	54.77 m/s
4	39.74 sec	63.25 m/s
5	44.43 sec	70.71 m/s
6	48.66 sec	77.46 m/s

A size 6 station spins 2 1/2 times slower than a size 1 station. For comparison, 50 m/s is 112 mph.

Original discussion here:
http://www.starfrontiers.org/forum/topic.asp?TOPIC_ID=993

The table below charts space station diameter, circumference, and the types of ship that can dock at the hub (by ship's Hull Size).

Station Size	Diameter	Circumference	Ship Types in Dock
1	200 m	628.3 m	1-6
2	400 m	1256.6 m	1-10
3	600 m	1885 m	1-14
4	800 m	2513.3 m	1-18
5	1000 m	3141.6 m	Any
6	1200 m	3770 m	Any