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.
In 1965, Vic Nicholson won 15 major time trials on the Moulton bicycle, was placed in 9 others and won the Reading Track League. In 1967, again on the Moulton, he broke the Birmingham-Bristol-Birmingham record by more than 25 minutes and regained the Cardiff-London record for Moulton by an 18 minute margin.
In this interview, recorded in February 2015, Vic talks to Tony Hadland about his cycle racing career, with special reference to his time on the small-wheeler. The interview is just under 32 minutes long and can be found in the Cycling section of this website. (Hover your mouse pointer over the word “Cycling” in the banner at the head of the page, then click on “Interviews”.) Or you can go straight to the Interviews page via this link: