Duomatic type hubs are back! Can't wait to make the 8 speed Brompton to a more simplified machine. Pictures of the S2C plus other new hubs below:
http://sunrace-sturmeyarcher.blogspo...bike-show.html
Sturmey already posted the info on their website.
http://www.sturmey-archer.com/products/hubs
Interesting. Thx
S2 weight - 930g
S2c 1400g
Bummer.
Only the 5 gears S-RF5 with 1090g has a reasonable weight per gear ratio.
Why would you want a two speed hub? The three speed gives you a low and high while the two speed only gives you direct drive and low.
I like the other hub which is supposed to go after the Sram Dual Drive. Interesting.
A two speed hub can be shifted by backpedaling, eliminating the need for a shifter and simplifying the riding experience.Originally Posted by Dahon.Steve
With the revival of old designs here's hoping they put the IG rear dynohub back into production. Even better if they upgrade it to an 8-speed.
Last edited by chucky; 03-26-10 at 06:34 PM.
Great news indeed. I can't wait for it to be available. I hope there are no more delays, though....
Chucky is right. The kick-shift and coaster brake hub eliminates all cables going to the back. You can see that on my Moulton MK3 restoration with the original Duomatic hub. Nice clean look. It also provides a great, fun riding experience. Not for hammerfests, tho....
Last edited by SesameCrunch; 03-26-10 at 06:50 PM.
I like gears. But I have an old Sears Tote-Cycle that splits in two. Right now it's single speed because I damaged the three speed hub I had on it, but when it has gears, the shifter sits underneath the seat. That way the bike has no cables running from the front to the back (coaster brake), so you can easily split the bike. I love the bike, but having a shifter mounted on the seat tube is a pain. I'm building a new 3 speed wheel because single-speeding is a pain, but I also keep wondering if a kick-back hub would be better. No cables at all other than the front brake. Could make shifting and transporting the bike a lot easier.
Sounds like a very good application for the S2C.
These two-speed kick back hubs could be combined with a Schlumpf Speed Drive for four usable, wide-range gears with NO cables or shifters. Something like: 40-55-66-91 For certain folding bike applications that could be nifty.
tcs
"When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.
"Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008
These Sturmey 2-speeds actually have direct drive and a +38% high gear.
Best,
tcs
"When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.
"Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008
That could be pretty sweet. Whenever I check out the Schlumpf drives, I'm always reminded how far out of my price range they are, but they sure seem tempting. Although I'm guessing there's no way to fit one in my Tote/Cycle. It's a one-piece crank, and, while I've been planning to get an adapter to put more modern cranks on it, I'd be surprised if that could work with a Schumpf. But for the right bike, you're right. Good gear range, no lines to get in the way when folding. No finnicky shifter to get out of adjustment.
I had a folding bike outfitted with exactly that, but didn't like it - the gears mostly used are the 2 in the middle, assuming you're not riding hills most of the time. That requires 2 shifts each time you change gears. I commuted like that a few times but found it very cumbersome, so dismantled the bike again. I also didn't like the way the Duomatic changed gear with every brake, I was forever guessing what gear it was in and back-pedalling to get it into the gear I wanted. So I sold that bike with the Duomatic still installed.
Spoilsport. Letting reality get in the way of perfectly good theory. Humbug.
I'm hugely interested in exactly such a setup--good to hear some real world feedback... even if it's not what I want to hear.
I know next to nothing. I am frequently wrong.
I welded an extra tube on my tote-cycle and added the SA sportshift.The SA coaster brake sure screeches when it heats up comming down a long hill!
Yes those are campy cranks and three colors of chain!
And I had to put the small chainring on the outside to get a good chainline.
That is awesome. I had been wondering about doing something like that with shifting. Seems like it'd be better than reaching under the seat to shift. How did you manage the crank/bottom bracket conversion? I've been considering something like this: http://harriscyclery.net/product/tru...apter-1335.htm
Is that what you used, or is there some other solution?
I've got a Bendix kickback 2-speed w/ coaster on a '65 Schwinn Lil Chic
I used one of these http://www.amazon.com/Bottom-Bracket.../dp/B0015XPIIA on my tote cycle.
Thanks! Now I have options. That way is certainly the more cost effective way to go, too.
S2C certainly is worth a try on my Brompton. One, possibly no cables running to the back, not a real range though with a +38% jump. Although what I am really looking for is a revival of the old medium range hubs. I am currently running AM internals inside a S-RF3 shell. Although all threads and such fit very nice I would like to have new AM internals new with no NIG and all the like. Even perfectly overhauled/lubricated/adjusted the hub shifts a little dodgy as compared to the brand new S-RF3. Note of caution though is that my only experience before the AM conversion was with S-RF3. Maybe old AWs shift the same as my current AM....it is really unforgiving even under the slightest load. With my S-RF3 I could find the sweet spot in the crank revolution where gears would just naturally find each other.
-Carcinogent
"Also new for this year is the CS-RF3 and CS-RK3 cassette 3 speed hubs. A hub that allows you to lose the front derailleur all together. Now you can run a multi speed cassette on a 3 speed internally geared hub. You can use any Shimano compatible shifters with this setup. "
This looks as a DualDrive replacement that works with standard shifters. A good solution drop bars + brifters. The DD uses propriety left shifter cable pull.
They have landed in the USA. Looking forward on testing it in a Brompton this weekend
I checked with Harris and they can build a wheel with the S2C for around $185 plus shipping.
Dahon Jifo
Dawes Kingpin 2speed
I discovered the S2C and B2C when looking for an S3X at Harris.
Any opinions on quality of the Sturmey S2C&B relative the Sachs and Bendix kickbacks?
Any difference between the S2C & B2c other than weight & price?
How much weight difference is there?
Last edited by meb; 08-11-10 at 01:06 AM. Reason: corrected B2C steel kickback hub
I noticed there are S3X 13T cogs for 3/32 chain. Will the S3X cogs work ok (assuming the ratio works) on the three kickback 2 speeds Sturmey has?
Are there any 3/32 chain compatible cogs for the Sturmey kickbacks in the 16-20T range?
Further, the lack of cables ease removal, installation and substitution.
In the winter, cables often ice up- the kick back/coaster approach has a big advantage in winter cycling.
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