SRAM 2-Speed Auto Shifting Rear Hub Gets Official

SRAM kinda sorta made it public a while back that they were working on some sort of internally geared auto-shifting hub for the commuter bicycle segment.

Well, now Bike Europe is reporting that it’s so official that it even has a name: Automatix. With its two gear ratios, 1:1 and 1:1.37, the SRAM Automatix automagically upshifts when a certain speed is reached and downshifts when slowing down. There are no shifters, cables or thinking required.

The two gear ratios offer a gear range of 124%, and shifting points can be changed to match a frame manufacturer’s specifications by choosing 7.5, 8.5 or 11.2mph (12, 14 or 18km/h). This is the first of more internally geared hubs to come from SRAM; 7- and 8-speed IGH models will be shown at Eurobike later this year. More after the break…

The nickel-chrome plated internal gear hub weighs 980gr and comes with a coaster brake. A range of sprocket sizes from 15 to 21-tooth are compatible with the SRAM Automatix. It’ll offer 28- or a 36-hole spoke drillings. Aftermarket versions will be available in August.

Quoted by Bike Europe: SRAM IGH product manager Marcus Schneider says that “the SRAM Automatix is the perfect addition to maintenance free bikes which are used every day to run errands, the way to the office or any short distance trips between 2 and 5 kilometers. With the three different preset shifting speeds manufacturers can either assemble a comfy city bike or a fast folding bike.”


Aaron - 04/27/11 - 5:11pm

Definitely would be cool to run one of these with a belt drive. The ultimate zero-maintenance bike.

Varaxis - 04/27/11 - 8:22pm

The future is here. This is part of the vision I had for the next evolution of a bike–automatic shifting based on speed. Need something like CVT and/or planetary gears to top it off. Derailleurs and cassettes are so 20th century.

Maybe in 10 years, dynos without much drag will be included. They’ll power electronics like the computers found in the latest generation cars today. Maybe provide alternate electronic shifting or a “drive-by-wire” experience–when they become efficient enough, maybe the dynos will power motors to help propel the bike.

kalt-o - 04/28/11 - 5:03am

Fantastic. Now ditch the coaster brake…

stevo - 04/28/11 - 12:38pm

hopefully a non-coaster version will be made available, too

Brad - 04/29/11 - 2:07am

This would be great for making a single speed that a bit more practical but still ‘hip’

Nathaniel MacLeod - 04/29/11 - 9:04am

I personally have a 3 speed Shimano version of this. What is the difference? This is old technology unless I am mistaken.

KGr - 04/29/11 - 6:19pm

“when they become efficient enough, maybe the dynos will power motors to help propel the bike”

Sure, as soon as someone finds a dyno, wiring harness, and motor that all happily violate the First Law of Thermodynamics.

jake - 05/07/11 - 12:45am

Yeah, what @KGr said.

Douche A55 - 09/22/11 - 10:25pm

@ Varaxis –

The automatic hub is 20th century technology.
It’s an update of a Fichtel & Sachs hub design from the 1960s.

tom - 02/02/12 - 6:58pm

y not have chain drives on both sides of the bike where the rear spockets freewheel in both directions.? in the rear hub i would have a rod with a clutch at either end which is shifted like a 3 speed via cable & moved to engage or lock either one of the freewheeling sprockets which then becomes the driving gear while the other freewheels. when this rod is shifted to where it engages neither of these two sporckets it becomes a non driving freewheel

bhtooefr - 08/24/12 - 1:05pm

Varaxis: Regarding having a dynohub power electronic shifting of a 3-speed hub… Shimano actually did that in 2007, but nobody bought the resulting bikes.

Zdenek Formanek - 02/08/13 - 10:06am

Hi, some experiences???

I have classic 28″ wheels and using singlespeed (coaster brake) 43 front and 16rear (indentic in 53/21 ratio) – it is ideal to 28km/h (aprox 100/s cadence), to Prague hills, a little bit hard ratio. But my bike is light and 23mm tires and SPD pedals… I like phylosophy of SRAM automatix, but I affraid:
1) looking for IDEAL ratio
2) is it possible finding iteal point for shifting gear…
What you mean?

My opinion, that fast gear is ideal for me 53/19 (or identical ratio), and climbing 38/19 (or identical ratio) and from 38 to 53 is very near to automatix gear…

please for your help. Thanx. Zdenek

B H Lim - 07/26/13 - 9:56am

I have fitted a SRAM Automatic 19T coaster brake hub onto a 26″ aluminium frame bicycle in Singapore. The front sprocket is a 39T aluminium crank and the total weight of the bicycle is 13.4kg. It’s wonderful and I love it.

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