I am several freewheel cogs: A 14, 16, 17, 18 and a 22.


If you get a cog tool/wrench they are super easy to remove and put back on.


I have a Fuji Feather as well. I replaced the factory wheels with Wabi Sub 15's. They have the added feature of Freewheel on BOTH sides of the rear hub.


I arrived at a 16 on one side and a 22 of the rear hub.


Why you ask? The 16 is for the normal riding around. I flip the hub IF and ONLY IF there is a massive hill that I must climb. In the Finger Lakes of NY state and we have some intense hills. (Normally I avoid them but sometimes they are not avoidable.)


You may want to buy a 14 and a 15 and a cog removal tool/wrench. Test and try out what you like!! And then you can fine tune it yourself and don't need a BIKE SHOP REPAIR guy to convince you of something you don't actually need or want.