They are great. A much better implemtation of a two speed than the S2C IMHO. Like you, I found the S2C inconsistant when changing (slight back pedal) and there were cases sometimes when they locked up. I have an older F&S two speed kick back which works the same way and is perfect every time I change, so I know its not my technique. I had the S2C fitted for about six months and did over 500 miles on it. It also took quite a while to loosen up and run free with loads of black grease oozing out the seals. In comparrison the the A2s really are fit and forget units and both were pretty free running from the moment I fitted them.
I would maybe like to modifiy them to move the change point up a couple of mph to around 10-11mph which is probably what they would change at in more common larger wheels, but all my bikes being smaller wheeled mean the change points are lower.
As I have already taken the one on the Brompton apart I will try it with that first.
Regards
Jerry
Last edited by jerrysimon; 07-25-12 at 03:49 AM.