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  • SRAM 36h Automatix 2 Speed Coaster Brake Rear Hub
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SRAM 36h Automatix 2 Speed Coaster Brake Rear Hub

by Sram
| 8 answered questions

List Price: $84.00
Price: $71.40 & FREE Shipping. Details
You Save: $12.60 (15%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
  • 2-speed hub shifts between gears automatically
  • 124% gear range
  • 130mm OLD
  • 980g
16 new from $71.39

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Frequently Bought Together

SRAM 36h Automatix 2 Speed Coaster Brake Rear Hub + Wald #6003 Hub Coaster Brake Strap With Nut & Bolt
Price for both: $73.40

These items are shipped from and sold by different sellers.

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Product Description

SRAM's Automatix 2 Speed hub is perfect for adding an extra gear to your single speed without ruining the elegance and simplicity.

Product Details

  • Product Dimensions: 22.8 x 1 x 0.8 inches ; 9.1 ounces
  • Shipping Weight: 3.4 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Origin: Imported (Taiwan)
  • ASIN: B00554464W
  • Item model number: 00.3115.003.000
  • Average Customer Review: 4.8 out of 5 stars  See all reviews (15 customer reviews)
  • Amazon Best Sellers Rank: #94,158 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Customer Questions & Answers

Customer Reviews

4.8 out of 5 stars
5 star
13
4 star
1
3 star
1
2 star
0
1 star
0
See all 15 customer reviews
The hub works great.
Frank E. Henn
What I didnt like at first is that the first drive is direct, while the second is 37% harder (so its harder to move the pedals, but you go faster).
rc
I've been riding it to work for three weeks now and I don’t know for sure – but I assume – that wheel size makes a big difference with this hub.
Dave G.

Most Helpful Customer Reviews

13 of 13 people found the following review helpful By M. Reagan on August 15, 2013
Verified Purchase
The hub performs well, even without modification. However, I'm tired of manufactures selling unfinished products. There were no big surprises when I opened the box, however they should have included the strap for the brake arm and some technical info. The box contained the hub,dust cap, C-clip and 19t cog - nothing else. The strap was quickly acquired off an old kids bike I use for parts. And I have calipers to get the flange dimensions to build the wheel:

WL, width from center to left flange 27.5 mm
WR, width from center to right flange 27.5 mm
dL, left flange diameter 70.0 mm
dR, right flange diameter 70.0 mm
S, spoke hole diameter 3.0 mm

So far I'm my complaints are limited to a 10 cent strap of sheet metal (and the screw and nut), and I few dimensions that SRAM has failed to provide. Not too big of a deal, and I already knew this from other reviews. SRAM help us out and give your customers what they need to turn this $75 hurricane-ready paper weight into something a bit more useful. Raise the price by a dollar to cover the extra expense of a sheet of paper and the strap kit.

I built the hub up on a 26x1-3/8 rim, and put it all on a old 3-speed I rescued from the garbage. I'm using a 36 T crank and the 19 T cog that it came with. I intend to use this bike for short rides. The 1st gear something nice and low to help me get up little hill and getting started from a stop, and the high gear to prevent me from spinning out when I want to cruise a bit faster. My first ride on the new hub I was very impressed with the automatic shifting. It is a very smooth transition between direct and overdrive, and much more comfortable feeling than I excepted. However, I felt it shifted up too soon for my use. Around 9.
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12 of 13 people found the following review helpful By Cross Creek on January 30, 2012
I love the new SRAM Automatix 2 hub. I ordered two of them to replace heavy, overly complex Nexus 7 and 8 speed hubs on "townie" bikes that we ride on mostly flat and rolling terrain. The Auto 2 provides seamless, thought-free shifting from 1:1 (which you can control by changing the provided 19 tooth cog to a larger or smaller one) to 1:1.37. The change occurs at pre-set speeds, depending on wheel size, and the hub automatically downshifts when you slow down, stop, or climb hills (with a slight hesitation in pedaling--you can keep it in the top gear by pedaling hard). We actually found it was easier to climb moderate hills than it had been with the 7 and 8 speed hubs, primarily because of the shedding of so much weight in the rear of the bikes, and somewhat less internal hub friction. Of course, we also shed the weight of shifting and brake cables, actuators, shifters, and one brake lever apiece, but the pounds lost from our rear wheels were most significant.

I built my wheels on 26" MTB and 650b rims, using straight 14 gauge (2.0mm) spokes. Since the Auto 2 is made for a variety of applications, It has somewhat large (3mm) flange holes. DT spoke washers took up the extra space.

Now the bad news. I received my first hub over a month after ordering, and way after the estimated delivery date. After a month and a half with no updated delivery date, I cancelled the second hub order and bought from another source--delivered within a week from my order. If you're in a hurry, have a back-up plan.
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13 of 15 people found the following review helpful By Kimble on July 26, 2012
Verified Purchase
I had my doubts when ordering the SRAM Automatix. The idea sounded great, a hub that changes gears automatically for you, but there was and still is a distinct lack of information on them.

It turns out my fears were unnecessary. This product does exactly what it says on the box. It's a two speed automatic hub.

I do have a couple of negatives to raise. I received no instructions in the box. This isn't a problem if you're an experienced wheel builder with a set of vernier calipers handy but very off-putting for a first timer. It also didn't come with a coaster brake clamp which you kind of expect if they're supplying you with a coaster brake. If you're looking for the measurements to put into a spoke length calculator they are:

axle width: 120mm
left and right flange diameters: 69mm
left and right flange distances: 30mm

The installation manual can also be found if you trawl through all the documents on the SRAM site.

How does it ride? Amazingly. Pedal away and when you hit a certain RPM (all depends on your main gear and wheel size), for me it is about 12kmph the gear changes and suddenly it's a bit harder to pedal but of course that lets you go faster. It's like having a fixie with the convenience of an extra gear.

When slowing down it will only change back down if you are climbing and pedaling. A minor annoyance but totally understandable. Just coast for a second and it will change down and you can continue climbing.

Overall, very happy and it's well worth the money for your wannabe fixie, retro, or just around the town bike.
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4 of 5 people found the following review helpful By Dave G. on October 23, 2013
I’m lucky to live in a city with great weather and a long flat bike path which runs very near to my home. I can ride this path almost all of the four miles to my job downtown. So I bought an inexpensive large-framed single-speed bike with 700c wheels and found my commute to-and-from the office to be quite easy. The bike path sections are about a half-mile long between street crossings and the bike is geared low enough (38/19) to make those street crossings easy. The problem was about halfway down the half-mile block, I was running out of steam and wishing for a higher gear. My bike frame has no lugs for routing cables, so the SRAM 2-speed Automatix hub seemed like a good solution. When I read the web reviews everything sounded great, except for the many complaints about the early shifting at too low of a speed. Even so, I liked the idea of this hub and wanted to take a chance, even if I wound up having to do some tuning of the spring tension. So I bought the hub off the web and took it to my local bike shop to have the rear wheel rebuilt. They had to order new spokes and the turnaround with labor took about a week and cost as much as the hub. The shop guy said it tested well for him, so I took it out for a few rides. I've been riding it to work for three weeks now and I don’t know for sure – but I assume – that wheel size makes a big difference with this hub. The shift point is controlled by the centrifugal force created by the rotational speed of the hub and it seems as if the hub I received was very well tuned for a 700c wheel. It DOES NOT shift too early for me! In fact, I have to crank my pedals pretty hard to activate the shift. By that time, this 57 year-old is getting a little winded.Read more ›
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