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Sram Automatic 2 Speed Hub

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4.3 out of 5 (4 ratings)
4 customer reviews

The SRAM Automatic hub shift automatically; when you reach a certain speed the hub automatically shifts to a higher gear, and when you slow down, it automatically shifts down.
  • Rear Hub Spacing: 130 mm
  • Hub Drilling: 36
  • Cassette Body Type: Single Cog Driver
  • Hub/Brake Compatibility: Coaster or Rim Brake
  • Spacers are included to change over-locknut dimension to 130mm
  • Intended Use: Cruiser/Comfort
  • Skewer Included: NA, Bolt-On
  • Speeds: 2
  • Gear Ratios: 1:1 and 1:1,37 = 124%
  • Hub shifts up at approximately 11.5mph, based on a 26 - 27" wheel size
  • 19t cog included
  • Weight: 980 gr
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120mm x 36 Hole (Coaster Brake)

Item #:42867-99420 
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Oregon1 - Apr 16th102 - Apr 18th
Minnesota50 - Apr 16th 
New Mexico0 - Apr 16th 
Utah36 - Apr 16th 

pickup_biking_man Available for pickup DETAILS
Portland, OR1 Apr 16th102 - Apr 18th
Ogden, UT0 - Apr 16th36 - Apr 17th
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87 - Apr 22nd
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130mm x 36 Hole (Rim Brake)

Item #:42867-99421 
Other #s:
Available to ship DETAILS
Oregon0 - Apr 16th77 - Apr 18th
Minnesota16 - Apr 16th 
New Mexico0 - Apr 16th 
Utah47 - Apr 16th 

pickup_biking_man Available for pickup DETAILS
Portland, OR0 Apr 16th77 - Apr 18th
Ogden, UT0 - Apr 16th47 - Apr 17th
Show More
63 - Apr 22nd
77 - Apr 23rd


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Customer Ratings

Current Customer Rating

4.3 out of 5 (4 ratings)

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Customer Reviews

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Great once shift point is adjusted

I have two of these, one I built into a 20" wheel for a folding bike, and one in a 700 wheel. The hub shifts seamlessly and gives 2 gears, the average of which would be a common singlespeed ratio, depending on your setup. The coaster hub version is heavier and has more friction than the freewheel version.

The only problem, and it's a big one, if you don't want to disassemble the hub, is that it shifts too early, dumping you into the harder gear at the worst moment, such as when climbing a slight grade, when it's probably more pleasant to just spin a bit. For me, this defeats the whole purpose: to have a ratio for climbing and a ratio for descents and flats.

I've adjusted both of mine to shift around 13-14mph and I really like this hub once it is adjusted. This requires opening it up and either resetting the spring tension, or winding a new spring. If you search, you'll find posts about this.

Pros: Feels like a singlespeed but with 2 ratios
No cables/clean appearance

Cons: Heavy
Occasionally shifts if you hit a bump

Would Buy Again: Yes
Would Recommend: Yes

Reviewed on: April 13, 2014
Reviewed by: Jon

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I rode this without any modification on 650B wheels with a 40 tooth chain ring, and shifting occurred absurdly early. Maybe it's designed to be used at a lower gear ratio.

If you want to adjust the spring tension you'll need a 22mm cone wrench to pull apart the hub and a set of fine needle nose pliers for removing the weight retaining clip. A stitching needle is also handy for holding the spring arm when you put the spring and weight back in place.

Pros: Smooth shift. Not having to install rear brake or shifting components is nice.

Cons: Out of the box the spring tension on the shifting weight is too light, so shifting occurs at a very low pedal cadence.

Would Buy Again: Yes
Would Recommend: Yes

Reviewed on: January 18, 2013
Reviewed by: Aaron H.

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Excellent hub, very smooth shifting, and not bad looking at all!

Pros: Grest, smooth shifting, easy to modulate coaster brake. Can be changed from 120mm to 130mm rear spacing.

Cons: Very noisy, when ridden through compacted gravel roads it rattles a lot

Would Buy Again: Yes
Would Recommend: Yes

Reviewed on: December 10, 2012
Reviewed by: Jorge I. Fernandez

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Good Hub for a Commuter Bike

I use this hub on my steel commuter bike with 700c wheels. I had Universal Cycles build the hub into a Sun CR18 rim, and have been happy with the build. I am using the rim brake version of the hub. Shifting for me is consistent at 11.5mph. I use mine with a 38t front chainring and a 22t cog. This gives me a low gear of 46 gear inches and a high gear of 65 gear inches. Works great for sprinting around town in traffic! The hub has noticeably less drag than the Shimano Nexus 3 hub it replaced. It has a couple of minor negatives, but they are not deal breakers for me. When you coast while in high gear, the hub drops back into low gear. If you start pedaling again while above the shift point, the hub immediately re-engages high gear. You can feel this happen in the pedals, but I got used to it quickly. Also, when coasting over bumpy surfaces, I can hear a small rattle from the hub. The rattle is not there when pedaling over bumps.

Pros: Low Drag, Consistent Shifting, Easy to use in traffic

Cons: Hub drops to low gear when coasting in high gear, Small rattles can be heard when coasting over bumpy surfaces

Would Buy Again: Yes
Would Recommend: Yes

Reviewed on: July 18, 2012
Reviewed by: Scooby214

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