| 4/7/2017 2:11 PM Long term use, 4 1/2 years at 60-80km per week urban by Terry My Sturmey Archer S2 wheel still runs great after 4 1/2 years. Replaced the 18 tooth with a 20 tooth sprocket. Stripped and rebuilt it twice and have replaced the cage bearings with SKF #20 loose balls with Shimano Dura ace grease and feels great. The sequential change is a minor rock back of the pedals, it will phantom change as the bike rocks over bumps or kerbs but just keep pedaling to stop this. Some auto shifts are to my benefit! It is a great gear hub to use in the traffic as you don't need to take your eyes off the road in front as the change is carried out by a short back rock of the pedals. I was looking at getting a spare S2 Duomatic wheel, in case at $99, but they are sold out.