After my local shop told me that Sachs F/Ws are no longer in production, I 1st bought a batch of oddball Shimano F/Ws on ebay, but I still needed a 13-23 (7 sp ideally). I got the Nashbar on sale at a great price, and it is fine, not quite as smooth as the Sachs, but as good as old high end SunTours and the like.
Jim I