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How It Works: 3 Speed Sturmey Archer AW Bicycle Gears
Thanks for this post, it is so clearly documented and photographed I’m inspired to start stripping one of my hubs! One question though, as the hub that most needs some attention is a Dynohub, I was wondering if you had any experience you could share relating to the risk of demagnetising the hub? Now how do we turn an AW3 into a 3SX? Having seen both of these hubs up close, it seems almost certain that the innards of the dynamo mechanism are identical, with the AWG also squeezing in a 3 speed gear mechanism too.
My Schwinn Racer 3Speed, How To OverhaulCleanLube SturmeyArcher 3 Speed Hub AW type Duration: The Folding Society I.
In Henry Sturmey, James Archer and Frank Bowden founder of Raleigh bicycles revolutionised cycling with the invention of the 3-speed gear hub. Sturmey-Archer produced gear hubs throughout the next century and garnered a loyal following of cycling connoisseurs in the process. The Sturmey-Archer heritage site has a huge collection of advertisements dating back from when the first gear hubs hit the spokes. Though they never really reclaimed their early twentieth century golden age, their site offers a wonderful trip through cycling, design and advertising history.
Anna Trench. Fancy a bit of It’s Nice That in your inbox? Sign up to our newsletters and we’ll keep you in the loop with everything good going on in the creative world. Glorious olds advertisements for Sturmey-Archer bicycle gear hubs. Words Anna Trench.
A growing source of Sturmey Archer information
Sturmey’s ever popular robust 3-speed AW Hub. The 4-speed FW Hub as favoured by Dr. Moulton in the ’60’s. From a very greasy page in the manual the AG 3-speed hub and Dynohub.
and common of all 3-speed hubs. The hub shell on Sturmey Archer hubs includes the month and year of manufacture as an open date code.
Your Sturmey Archer hub can offer a good way to decide on the age of your bicycle. You can find the hub date displayed clearly on many hubs. Early hubs are more difficult to date accurately. I have compiled the information below from hubs that I have actually seen either in person or from a clear picture. If you have a hub which contradicts any information on this page I would like to hear from you. From to Sturmey Archer clearly marked their hubs with a date. This hub date marking will show the last two figures of the year and the month.
From to Sturmey Archer used the model designation with just the last digit of the year. I have seen K hubs and KB hubs with this marking. Before Sturmey Archer gave each hub an individual serial number. I have been researching these numbers for some time. I am now able to share some results of my research here. Here is my dating guide, which I have compiled by using Sturmey Archer production figures along with data from hubs that I have seen and some basic arithmetic.
Advice on dismantling and rebuilding an old Sturmey-Archer AW 3-speed Hub
Instructions for a wide range of Sturmey-Archer hubs from to The files are in Adobe Acrobat format, making them zoomable and easily printable. Content last added 21 June In the beginning 3-speed. K series S-A hubs. Type KB
: Sturmey Archer Mark I Indicator Chain 3 Speed: Bike Hubs: Sports Date First Available: September 1, ; Manufacturer: Sturmey-Archer.
Sturmey-Archer is a manufacturing company originally from Nottingham , England. It primarily produces bicycle hub gears , brakes and a great many other sundry bicycle components, most prominently during their heyday as a subsidiary of the Raleigh Bicycle Company. In the past, it also manufactured motorcycle hubs, gearboxes and engines.
All Sturmey-Archer gear hubs use epicyclic planetary geartrains of varying complexity. The AW is the simplest, using one set of planetary gears with four planets. The AM uses three compound planets with differently sized cogs machined from a common shaft to engage the gear ring and sun gear separately, while the close-ratio three-speeds, and hubs with four or more speeds, use multiple planetary geartrains.
Depending on the specific hub these may be in series with each other, or with one or the other set being selectable at any given time by locking a particular sun gear to the axle. In , the K hub was introduced as an updated and improved version of the X, later FX hub following the introduction of fine axle threading – it is the Model X which was manufactured under license by BSA as their 3 speed hub until Most notable was the 6-prong ramped sliding clutch which was mounted between springs, this gave the advantage of lateral movement being possible without shifter movement and allowed gears to be pre-selected while pedalling, the ratio would change when pedal force was relaxed, freeing the mechanism to slide into the new gear and under spring pressure.
The ramped clutch dogs and sprung mount also permitted the K hub to be without a neutral position between the ‘Normal’ direct drive gear, and the ‘High’ overdrive gear, both the SW and AW until the mid s have this neutral position. The gear ring dogs would ratchet around the clutch using the ramps and springs if the hub was trying to engage Normal and High gear at the same time, though allowing this to happen through slow shifting can cause excessive clutch wear and render the hub inoperable.
In Low gear, this isn’t a problem as the low gear pawls can be overrun by a higher gear, while Normal and High gears use the same pawls, requiring an alternative solution. The K hub spawned a Tricoaster version with back pedal brake, designated KC, in and both close ratio KS , and medium ratio KSW variants in and respectively. The KB was joined in by the KT mm tandem drum brake, part of a family of mm drum brakes alongside the BFT and BRT front and rear drum brakes BR type drum brakes are not gear hubs and are instead threaded for fixed sprockets or freewheels.
Glorious olds advertisements for Sturmey-Archer bicycle gear hubs
Sturmey-Archer was one of two major manufacturers of internal-gear hubs in the early and mid 20th century. Shimano has made internal-gear hubs since The Sturmey-Archer AW 3-speed hub, by far the most popular one, was durable and, easy to maintain and rebuild. Quality issues also began to creep in. Sturmey-Archer history is covered in the book The Sturmey-Archer Story and its online update by Tony Hadland ; bits and pieces of the history are in the technical articles on this site.
Sheldon wrote, sometime before his untimely demise in lmost all English 3-speeds have Sturmey-Archer rear hubs, and there have been many different models since the company started in
Vintage sturmey archer AW patent 3 speed bicycle bike rear buh pre patent written on hub but no date complete with original wheel nuts. Toggle chain and.
Sturmey Archer 3 Speed Hub S-RF3 36 Hole
just bought a rusty 3 speed bike, and I don’t need another bike! Re Sturmey Archer date marks: since production resumed in ~ in Taiwan.
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Sturmey Archer 3 speed rear sprocket?
In stock now a whole range of Sturmey Archer hubs and hub spares. And even a 12 Volt 11w Compact Fluorescent. The Sturmey Archer FX hub was made in only, so nowadays its a rare hub. Cyclo Benelux Mark 7 changer dating from. Here are photographs of the Raleigh Sports English 3speed Bicycle.
Sturmey-Archer’s hub shells were mostly designed simple and cylindric – whereas At a later date several cylindric hub, eg. the models or the duomatic were were smaller in diameter than the average 3 speed Sturmey-Archer hub.
Finally, the site includes technical and product service information which will help anyone renovating ancient bikes. Now production has been moved to Taiwan and the tradition of innovation and reliability continues. ALL Henry Sturmey was also editor of a cycling magazine and so ,from the beginning, Sturmey-Archer always saw the benefit of advertising.
Many of the advertisements are no longer politically correct but reflect thinking at that time. Motor cycles were a booming industry in the early part of the 20th century and various types of engines and gearboxes were then produced. There was even a production unit in Germany and later, engines were supplied for lawn-mowers and small tractors.
Here can be found general company information, sales catalogues, prices and bike pictures through the years, newspaper articles, production information and factory views. The current range of products can be viewed on www.
File:Sturmey-Archer SW hub exploded view parts
This is my oldest-numbered currently useable Special Sports frame, V My guess would be that the frame dates to around , based on some other Speedwell numbers I have seen. I carefully used some very fine steel wool, with oil, on the frame and fork, which removed most of the yellowed varnish and, like a restored old painting, the areas of white became clear again. The process improved the colours, but I was extra careful around the decals on the forks and seat tube.
Also, some paint schemes may look better with the varnish left as is.
Primarily with internally geared hubs—called gear hubs by the Europeans. When I had a shop in the 70s there were still quite a few Sturmey Archer 3-speed hubs,.
Many of them were staged, e. At a later date several cylindric hub, eg. For this reason it is mostly easier to open Sachs hubs. You will take a special tool for opening Sturmey-Archer hubs or it takes some tricks. Sachs did not use pawls for transmission power to the hub shell but the applied roller ramp clutches in their early days – which was already mentioned in other chapter.
It took a while until pawls came into play. Sturmey-Archer’s pawls of the ring gear were mostly pivoted in pins, whereas Sachs turned to use easier and smaller pawls after the model They were pulled out of engagement together with the ring gear which needed a longer toothing therefore. In the Sachs Elan, however, the ‘Sturmey-Archer principle’ was applied in the joint planet carrier with pressing pawls inwards for deactivating them. Sturmey-Archer built hubs with differential planetary gear trains in a very early time period, whereas Sachs realized this technology only in the Elan hub.
The Elan contained two stepped gear trains coupled together, however, achieving a very uniform gear gradation. Moreover, the principle of cam rods was very innovative from a technical point of view – but the triggering was pretty complicated and built rather large. The technology applied in the famous Duomatic and Automatic hubs is also very well-done.