This file: http://user.it.uu.se/~embe8573/bike/bearings.txt How many bearings has a single speed bike, assuming an F&S Torpedo coaster brake hub? Answer: rear hub 3 [1] crank/BB 2 pedals 2*2=4 [2] front wheel 2 head tube + 2 [3] ----- 13 Bonus fact: The balls are sometimes loose, sometimes in a retainer, both in the rear and front wheel hubs. [1] 2 big, 1 small. The 5-roller clutch is not a roller bearing. [2] For cheap pedals: 2*1 = 2. Then the total is 11. [3] Headset 1, fork 1.