Made Significant Changes To My 3 Speed Commuter
#26
always rides with luggage
Joined: Feb 2005
Posts: 2,109
Likes: 20
From: KIGX
Bikes: 2007 Trek SU100, 2009 Fantom CX, 2012 Fantom Cross Uno, Bakfiets
I found this post about SRAM Automatix quite informative, https://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 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.
__________________
--Ben
2006 Trek SU100, 2009 Motobecane Fantom CX, 2011 Motobecane Fantom Cross Uno, and a Bakfiets
Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014), 2008 Citizen Folder (2015)
Non-Bike hardware: MX Linux / BunsenLabs Linux / Raspbian / Mac OS 10.6 / Android 7
--Ben
2006 Trek SU100, 2009 Motobecane Fantom CX, 2011 Motobecane Fantom Cross Uno, and a Bakfiets
Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014), 2008 Citizen Folder (2015)
Non-Bike hardware: MX Linux / BunsenLabs Linux / Raspbian / Mac OS 10.6 / Android 7
#27
Newbie

Joined: Jul 2012
Posts: 2
Likes: 0
From: Greater DC area
It doesn't look like there's anyone selling prebuilt wheels with the Automatix hub. Those of you using one, did you rebuild your wheels yourself? I like the idea of the Automatix (I somehow coincidentally found out about it somewhere else a few days ago), but I don't know how to build wheels yet.
#28
Junior Member
Joined: Jul 2012
Posts: 5
Likes: 0
From: Chicago



I couldn't find measurements of the hub, so I had professionals at my LBS build me a wheel with Velocity A23. I had to add one chain link to stock Uno chain.
#29
It doesn't look like there's anyone selling prebuilt wheels with the Automatix hub. Those of you using one, did you rebuild your wheels yourself? I like the idea of the Automatix (I somehow coincidentally found out about it somewhere else a few days ago), but I don't know how to build wheels yet.
For what it's worth... You can get a Sturmey s2c kickback coaster hub prebuilt in a wheel at Amazon. Niagara Cycle sells it as a Torker KB2 wheel, for about $125. I didn't want the kickback hub, but thought this was a pretty good deal.
#30
Palmer

Joined: Mar 2007
Posts: 9,153
Likes: 2,263
From: Parts Unknown
Bikes: Mike Melton custom, Alex Moulton AM, Dahon Curl
Now, and this is important, you gotta line up 2nd gear accurately. If you don't get 2nd lined up, your hub can have a short and very unhappy life.
The Shimano 3-speed bell crank has an indicator on it for 2nd gear alignment, and the Sturmey hubs have a shoulder that lines up with the end of the axle. With your friction shifter, you have to know ~somehow~ when the shifter is in the right position to align 2nd gear. Mr. Brown said on his set-up that it was when the shifter pointed at his navel.
Of course the other two gears are found on the shifter at cable slack and cable taut.
Besides friction shifters, another approach with a three-speed is to use a many-speeds indexed shifter (DT, bar end or brifter) and set one of the middle index positions to 2nd gear. This acurate shifter index position can be found when riding by counting clicks, visual observation, looking at the shifter's indicator (were applicable) or feel.
At a cycle swap meet I picked up an old Shimano LH (front) bar end shifter that had a single index click position in the middle of its travel. It's perfect for three-speed hub 2nd gear shift position.
#31
always rides with luggage
Joined: Feb 2005
Posts: 2,109
Likes: 20
From: KIGX
Bikes: 2007 Trek SU100, 2009 Fantom CX, 2012 Fantom Cross Uno, Bakfiets
Wow, what cog did you go with in the back? I kinda like 39/16 (the way it came out of the box), so I suppose I might go up to an 18 or 20 if I went with an Automatix. I would probably ask the LBS to use an rear wheel I have laying around, as I bought my Uno with a set of Alex SUB wheels (the stock Jalco wheels were everyone's complaint, so I was scared).
__________________
--Ben
2006 Trek SU100, 2009 Motobecane Fantom CX, 2011 Motobecane Fantom Cross Uno, and a Bakfiets
Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014), 2008 Citizen Folder (2015)
Non-Bike hardware: MX Linux / BunsenLabs Linux / Raspbian / Mac OS 10.6 / Android 7
--Ben
2006 Trek SU100, 2009 Motobecane Fantom CX, 2011 Motobecane Fantom Cross Uno, and a Bakfiets
Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014), 2008 Citizen Folder (2015)
Non-Bike hardware: MX Linux / BunsenLabs Linux / Raspbian / Mac OS 10.6 / Android 7
#32
Half way there
Joined: May 2011
Posts: 1,109
Likes: 1
From: Durham, NC
Bikes: 69 Hercules, 73 Raleigh Sports, 74 Raliegh Competition, 78 Nishiki Professional, 79 Nishiki International, 83 Colnago Super, 83 Viner Junior
About the automatic hub: If it is set to shift at 11.5 mph, will it do so if you cross this threshold going up hill? I am not sure that I would like an unexpected shift into high.
-G
#33
Yes, it will shift into high. I have my gearing set up to keep this from happening. I accommodated for this in my gearing. I go up hill comfortably at about 10mph, so the bike stays in first. If I lived in a very hilly area, I wouldn't want the Automatix hub.
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