A.
anwered by: canteau
It's about as loud as any other standard freewheel. If the So Cal Flyer has a rear hub with 30 x 1mm threading it should work. The easiest way to tell what the threading is, is to count the number of teeth on the old cog. If the tooth count is 16t or more it will not fit, if it is 15t or less it will.