Focus on the ride, not your gear with SRAM's Automatix 2 Speed Hub. A centrifugal clutch in the hub automatically changes gears based on your speed, so there's no shifter, no cables, and no nonsense. All you'll have to do is sit up and enjoy the ride!
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Purchased this item last month when it was on sale. Price was too good to pass up and I was tired of my single-speed commute. My bike was geared low enough to take off easily from a stoplight, but I was running out of steam about halfway down the block. The SRAM 2-speed auto-hub seemed like a good solution and had good reviews. My local shop laced the hub into my rear wheel, but unfortunately I couldn't reuse the existing spokes. This is understandable, but the wait for parts and the labor involved (plus the added cost) was frustrating. Finally got the bike back about 5 days ago and I've used it twice now for my 4 mile commute to work. I ride on a long flat bike path with about a half-mile between street crossings. Every SRAM Automatix review I read seemed to only have one complaint. The hub shifted too early and at too slow of a speed. Well, either I got a good one or maybe the others were installed on bikes with smaller wheel diameters. My bike has 700C's and the hub seems very well tuned for this size of wheel. Actually, it takes a bit of effort for me to get up to the shifting speed and by that time I'm a little winded. But once the shift occurs, the bike rides along very comfortably in the higher gear. So long as I continue to pedal, the hub does not jump back down into the lower gear. But if I start coasting - even at higher speeds - then it will shift down and I'll need to pump the pedals to shift it up again. I have to say that this hub works just like SRAM says. It gives me a much wanted higher gear and I think it's pretty slick. It really makes my bike more fun to ride. If you own a single-speed with a coaster brake (like me) - or you ran out to buy that fixie after watching 'Premium Rush' - and now wish you weren't stuck in low, then this could be a good option for you. Luckily, my bike had the proper hole to bolt on a rear brake caliper. So all I had to do was install a hand lever and zip-tie the brake cable to the frame top tube. Voila! I even like the new rear brake way better than the original coaster.