New content on K-series Sturmey hubs

If you go to the section of this website that provides detailed information on how to repair old Sturmey-Archer hubs, you’ll find new content on the K-series 3-speeds of the 1920s and 1930s. Not all the material is explicitly about repairing the hubs but it may prove useful and interesting to some readers.

There is now an 18-page PDF file (zoomable and easily printed) that includes all the following content:

  • The late great Jim Gill’s description of the type K hub and the changes made to it during its production run (2 pages).
  • A cutaway drawing of the 1922-1933 model.
  • Jim’s simplified instructions for dismantling and re-assembling the type K.
  • Jim’s analysis of the type K’s “no intermediate gear” feature, which went AWOL in 1935.
  • Jim’s tabulated analysis of 20 type K hubs manufactured between c.1925 and 1937 (2 pages).
  • S-A’s 1925 parts list and exploded diagram of the type K .
  • S-A’s 1935 exploded diagrams and parts lists for the type K, type KS and type KSW hubs (5 pages).
  • S-A’s 1937 exploded diagrams and parts lists for the type K, type KS and type KSW hubs (5 pages).

Go to the Cycling tab above, click on Gears and scroll down the list to “How to repair old Sturmey-Archer hubs”. Or just click on this link: https://hadland.wordpress.com/2012/07/02/how-to-repair-old-sturmey-archer-hubs/

Update 22 June 2016: I’ve also added material on the K-series brake hubs (KB, KC and KT) and on S-A’s 1930s drum brakes (BF, BR, BFT and BRT).

Major new cycle history interview

Interested in the history of Raleigh, Sturmey-Archer, Brooks, Pashley or Moulton? Or maybe in the wider development and changes the British cycle industry has undergone in the last 50 years? Then this interview, which I recorded on 23rd March 2016, is for you.

John Macnaughtan spent 48 years at Raleigh and Sturmey-Archer. Early in his career, he was sent to Raleigh South Africa and he soon became Director of Raleigh Industries East Africa. Later, with David Duffield, he set up Raleigh Australia. John joined Sturmey-Archer in 1977 and became Sales and Marketing Director in 1981. After the sale of Sturmey-Archer to Sun Race, he became Managing Director of Raleigh International. He was instrumental in saving the Brooks saddle company and became a co-owner of Pashley. Today, he spends much of his time at Bradford-on-Avon, dealing with the export of Moulton bicycles.

The interview, in two parts and full of unique insights and recollections, is now on the Veteran-Cycle Club YouTube channel.
Part 1: John Macnaughtan interview Part 1
Part 2: John Macnaughtan interview Part 2

2016-03-21 John Macnaughtan.jpg

New hub and bracket gear tables

You may have seen elsewhere on this site (in the comments on John Allen’s hub gear table in the Gears section) that Wiel van den Broek has created some very useful Excel spreadsheets for gearing choices involving hub gears and bracket gears. You can enter the tyre format, chainwheel and sprocket sizes and instantly compare the results given by different gears.

The gears covered range some more than 100 years old to others that are in current production. There is a metric (distance travelled per pedal rotation) chart and a gear inches chart (equivalent direct drive wheel diameter), both of which you can download from here: http://fietssite.jouwweb.nl/downloads

Many thanks to Wiel for creating these spreadsheets.

Tony

News about the Sturmey-Archer Story supplement

It’s amazing to think that 28 years have passed since my book The Sturmey-Archer Story was published. You can still buy it from the Veteran-Cycle Club’s sales officer (email: clubsales@v-cc.org.uk) or from Dorothy Pinkerton (telephone: +44 (0)121 350 0685). Remarkably, the price has hardly changed, despite decades of inflation.

Whether you are a new purchaser of the book or bought it years ago, don’t forget to read the free supplement. It contains a host of information, some of which is not available elsewhere:

  • Product developments by Sturmey-Archer and its competitors in the period between publication of the book and the closure of Sturmey-Archer’s British operations.
  • How Sturmey-Archer ceased to be a British company and became Taiwanese.
  • The auctioneer’s detailed list of Sturmey-Archer plant sold off when the British factory closed.
  • Additional information about the period covered by the book.
  • Corrections.

The supplement is available free of charge on this website by clicking on the Cycling tab above and following the drop-down link to Gears. But if you want a printer-friendly version, so that you can print out a tidy 26-page A4 version, click here: S-A Story supplement

You can also save the supplement as a PDF file to read on your desktop computer, tablet or phone by right-clicking the link above and ‘saving link as’.

Tony

Sturmey’s right-hand ball rings: are you losing the thread?

Some instructions for disassembling Sturmey-Archer gears include a mysterious statement such as this:
“Next, unscrew the right-hand ball ring but because it has a two-start thread and must be replaced in its original position, that position must be marked. String or adhesive tape may be attached to the spoke nearest to the letters ‘SA’ which are stamped in one of the notches on the ring.” (From the 1956 Master Catalogue, sub-section 4, page 15, paragraph 1.)
The reason for replacing the right-hand ball ring in the same position is as follows. If the ring is screwed back in the alternative position, 180 degrees out from its original position, there could be some slight distortion of the completed assembly, due to a very slight difference of alignment between the hub shell and the ball ring. Whilst not noticeable at the hub end, it can result in the rim being slightly out of true. (The longer the spokes, the more the discrepancy is amplified.) So the precaution is in order to avoid the possible need to re-true the wheel.
This matter is not well documented but the rare 1992 Sutherland’s Handbook of Coaster Brakes and Internally Geared Hubs makes the point clearly. To facilitate correct re-assembly, Sutherland’s advises marking the ball ring at the point nearest the lubricator, rather than attaching tape or string to a spoke.
The reason for the two-start thread is to facilitate screwing the ball ring in relatively quickly, while having a stronger mechanical connection than an equally fast single-start thread would offer. For a given screw pitch, a two-start thread will screw in twice as fast as a single-start thread.
Tony

How to repair old Sturmey-Archer hubs

Instructions for a wide range of Sturmey-Archer hubs from 1902 to 2001. Includes the original 1902 3-speed, the type K series of the 1920s and 30s, the T and TF 2-speeds, the ever popular AW, the SW, SG, SB, AB, AG, TCW, AM, AC, ASC, FW, FG, FM, FC, BR, GH6, S3B, S3C, all 5-speeds, the Columbia 3-speed, the BSA 3-speeds (based on a Sturmey-Archer design) and the hubs in production when Sturmey-Archer ceased to be British-owned in 2001. Also included is information on the DBU and FSU accessories for use with hub dynamos. The files are in Adobe Acrobat format, making them zoomable and easily printable. (Content last added 21 June 2016)

In the beginning
1902 3-speed

BSA 3-speeds
Includes Jim Gill’s material on the rare split-axle versions

K series 3-speeds (K, KS and KSW)
An 18-page PDF file that includes Jim Gill’s analysis of the type K, design changes during its production run, cutaway drawings, Jim’s simplified instructions for dismantling and re-assembly, and S-A’s parts lists for 1925 and 1935.
K series S-A hubs

K series 3-speeds with drum or coaster brakes (KB, KC and KT)
A 13-page PDF file including Jim Gill’s description and analysis of the type KB 3-speed and drum brake, and S-A’s 1937 maintenance instructions and parts list.
Type KB 1937

A five-page PDF including Jim Gill’s description and cutaway drawing of the type KC 3-speed and coaster (back-pedal) brake, plus S-A’s 1925 parts list, Jim’s dimensioned drawing of the hub shell and his handwritten notes on (and sketches of) the type KC.
Type KC

A single page PDF showing S-A’s exploded drawing of the type KT 3-speed and drum brake for tandems. Also included are details of the special brake lever fittings.
Type KT

S-A 1930s drum brakes without gears (BF, BR, BRT and BFT)
A two-page PDF showing cutaway drawings of the 1932-36 versions of the type BF and BR brake hubs.
Type BF & BR 1932-36

A nine-page PDF including S-A’s 1937 maintenance instructions and parts list for the BF and BR hubs.
Type BF & BR 1937

A four-page PDF with cutaway drawings of early and later versions of the BRT and BFT tandem drum brakes.
Type BRT & BFT 1936-41

From the 1956 Master catalogue
Fitting and adjustment

Use and maintenance

Fault finding

General dismantling

Individual dismantling

Inspection

General re-assembling

SW wide-ratio 3-speed
(See also Brian Hayes’ paper)
SB wide-ratio 3-speed/hub brake

SG wide-ratio 3-speed/Dynohub

AW wide-ratio 3-speed (see below for later AWs)

AB wide-ratio 3-speed/hub brake

AG wide-ratio 3-speed/Dynohub

TCW wide-ratio 3-speed/coaster

AM medium-ratio 3-speed

AC ultra-close-ratio 3-speed

ASC fixed-wheel 3-speed

FW wide-ratio 4-speed
FG wide-ratio 4-speed/Dynohub
FM medium-ratio 4-speed
FC close-ratio 4-speed
BF & BR hub brakes
GH6 Dynohub
Dry Battery Unit & Dynohub wiring

Other Dynohub & Filter Switch Unit wiring information
FSU circuit diagram and notes
Wiring diagrams

Instructions from various dates, 1960s – 2001
S3B 3-speed with small-diameter hub brake
S3C 3-speed coaster
S5 5-speed
S5/1 5-speed
S5/2 and Five Speed Alloy 5-speeds
S52 1988 modifications
5 StAr and 5 StAr Elite 5-speeds
Columbia ‘no-slip’ 3-speed (Jim Gill’s documentation)
AB/C & BF/C 90mm hub brakes
AW 3-speed
AWC 3-speed coaster
AT3, VT and ST Elite hub brakes
Sprinter 5-speed hub and Sprinter 5-speed Elite 5-speed hub brake
Sprinter 5-speed coaster
Sprinter 7-speed hub & Sprinter 7 Elite 7-speed hub brake
Sprinter 7-speed coaster
Steelite SBF, SBR & SAB hub brakes

Triggers & Twistgrips, 1950s & 1960s
SA 1951 trigger instructions
SA 1956 trigger instructions
Twistgrip parts c.1966
Auto Twistgrip service instructions c. 1969


All information provided here is done so in good faith. It is as written by the original authors and has not been modified by Tony Hadland. No responsibility can be accepted for any loss, damage or injury of any kind sustained for any reason arising therefrom. Our thanks go to Sturmey-Archer Limited and Jim Gill for permission to reproduce their material.