Originally Posted by
SCRer
I found this post about SRAM Automatix quite informative,
http://forum.ctc.org.uk/viewtopic.php?f=5&t=62320
I have one in
Motobecane Fantom Cross Uno, with stock chain ring and 700x25 tires i got 53 and 72 gear inches. It get me quickly across intersection and I can cruise easy at 20-23mph.
I installed second stock spring (from another hub) and now it shifts at ~15mph and 94 cadence. The only downside is that this hub can shift sooner to high gear when You hit some bump in a road.
I've also noticed the early shift when hitting a bump. For me, it only does it when I'm pretty close to 11mph when I hit the bump.
Clever idea to install the second spring. I like the shift point where it is on my bike, but I can see how this would be very helpful when using the bike with smaller rims on a folding bike.
Another observation I've made about the hub is that high gear seems smoother than high gear on my Nexus 3. The hub seems to have a little less drag overall than the Nexus 3, though I don't think it makes any significant difference in use.