So my rear freewheel hub broke on my single speed belt driven (no metal chain) trek district.
Since I have to replace the rear hub, I'm thinking of replacing the rear hub with an internally geared multi-speed one. All the bike shops around here seem to have the Sturmey-Archer 3spd, wheras all the youtube videos of people replacing their Trek District hubs are with Shimano Alfine 8 speed.
I'm riding mostly flats and just need the gears for an uphill bridge (Williamsburg Bridge from Brooklyn to Manhattan) that I ride over every day.
Which hub should I get? Is the Sturmey-Archer 3spd fine? How would the gears on that 3 speed compare to the single speed gearing that I currently have?