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Sturmey Archer dual 3x9

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Sturmey Archer dual 3x9

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Old 06-13-18, 08:55 PM
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bent4me
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Sturmey Archer dual 3x9

I'm looking to upgrade to 1x9 with Sturmey Archer as it seems Sram no longer makes the dual drive. I can get away with shorter derailuer cage for better ground clearance. I am concerned about reliability. Anybody have this setup to comment on.
It will be going on a new folding trike.

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Old 06-15-18, 09:12 AM
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fietsbob 
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Worry if you choose,


.. the the epicyclic 3 speed gear system of Sturmey Archer is over 100 years old..

I have owned my 1st 3 speed in the 50s.. the new ones are easier shifting
(had a 94 AW3 and a BSR, in 2 bromptons, the newer NIG design& shifter works easier than the steel trigger
on the older AW3)
zero issues with the 3 speeds *
reading material.. abounds on S-A hubs
Sturmey-Archer CS-RF3 Silver
http://www.sturmey-archer.com/files/...20FREEHUBS.pdf

http://www.sturmey-archer.com/files/...3%20CS-RK3.pdf

*reduction gearing my latest BSR with a 2 speed geared crank . drive is as if a 21t chainring in low,

the gears never disengage, the application is how it gets the hubshell to turn
at a different rate than the cog.
pawls connecting them ..




mm Morning coffee ~o)


..

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Old 06-15-18, 05:19 PM
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Tern had many problems (google searches will bring up some posts) when they first released bikes with the then new Sturmey Dual Drive .. the problem bikes had been in and out of authorized repair shops trying remedy the shifting issues .. one long thread on the Tern official site had multiple different users with more or less the same shifting problems.. new SA replacement hubs were issued but with the same symptoms .. at least one owner got a SRAM Dual drive as a warranty replacement and his problems disappeared .. of course, that was then and this is now and SA may have made some changes to address the early issues..
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Old 06-16-18, 07:18 AM
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I have the Sram Dual Drive so I can't comment on Sturmey Archer. I can't fit a front derailleur on my folder, so I got the Dual Drive for more range of gearing. I am running a 11/32 eight speed cassette.

If the Sturmey Archer is like the Dual Drive where 2nd gear is direct drive and 3rd gear is an over drive, you need to figure out what chainring you want that will give you the range of gearing that you want. Most of the time when I am on flat ground, I am in 3rd gear on the Dual Drive. That way I can shift down to 1st gear on the Dual Drive to have the really low gears that I need for steep hills.

I am not familiar with your folder, but my folder uses full length outer housing on the shift cables and those cables follow a rather convoluted routing, I do not recall how long the cables are but I buy tandem length cables. Thus, I have a lot of cable friction. At times the Sram spring was just barely strong enough when pulling on the shift cable due to that extra cable friction. I occasionally use some tri-flow lubricant in the cable housing and need to avoid sharp bends on the cable which adds friction.

I assume that you already have checked to make sure that the hub will fit in the frame dropouts, the Sram is 135mm but I do not know what the Sturmey Archer is.

I use a Sturmey Archer three speed bar end shifter to shift my Sram hub. I use drop bars on my folder with bar end shifters.

I started out with a 1X8 system, but the Dual Drive gave me the extra gearing range that I really needed, so for me it was a very worthwhile addition to the bike.
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Old 06-16-18, 09:04 AM
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Recently introduced 3 speed geared crank, needs no front derailleur.

Efneo GTRO, so with that you can use a common rear cassette hub ,
and still get the gear numbers.. and range..



..
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Old 06-16-18, 05:33 PM
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Originally Posted by fietsbob View Post
Recently introduced 3 speed geared crank, needs no front derailleur.

Efneo GTRO, so with that you can use a common rear cassette hub ,
and still get the gear numbers.. and range..



..
Not light. The right-side crank/gearbox, sans BB and left-side crank arm, alone is 1.2kg.
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