Sturmey Archer Dynohub "8 59" 32H Wheel Build Information FYI
 

Just though I'd post the following information for those who don't know yet:

Sturmey Archer Dynohub
Made In England
"8 59"
32 Hole

OLD = 93.00mm
Flange Diameter NDS = 42.00mm [Slotted Paired Holes - 18 Degrees]
Flange Diameter DS = 102.00mm
Offset NDS = 32.00mm
Offset DS = 25.50mm


If you think the NDS holes are simply slotted evenly spaced holes - that is not the case.

The NDS are actually slotted paired holes - much like some of today's boutique paired hole hubs.

For the above noted hub - the degrees for each pair is 18 degrees. When entered into the "PAIR-HOLE-HUB-CHART" tab of the spreadsheet at:

http://www.mrrabbit.net/wheelsbyflemingapplications


The crossing factor for 2 Cross = 2.10 Cross
The crossing factor for 3 Cross = 3.10 Cross


If your Sturmey Archer Dynohub (Vintage Models) is of some other hole count - you'll need to measure the degrees per pair - and enter into the "PAIR-HOLE-HUB-CHART" utility to find out what modified crossing factor you would need when calculation spoke lengths for your particular wheel.


Hope this information is useful for someone working on one of these hubs.

=8-)

Hey, good stuff!

The LED lights of the last few years have returned the classic 6V Sturmey-Archer Dynohubs (1945-1983) to the category of useful devices. But - and it's a big but - with their chrome-plated steel hub shells, they're breathtakingly heavy, even compared to modern dynamo hubs.

Fun fact: Tommy Godwin used an earlier model Sturmey-Archer Dynohub while setting his "most distance covered in a calendar year" (1939) world record: 75,065 miles!

i heard in the past that sturmey archer products
were good up until the company ran in to problems in or around the 70s
and after that were much less good
until production moved to taiwan
and they are good again

this agrees with my experience of seeing loads of older sa equipped bikes still alive
but seldom seeing middle aged sa equipped bikes
but this could just be confirmation bias

please comment on this if you are able

Thanks for the data. I've never built around one of these old dynohubs with unequal flange diameter, but this will come in handy if it comes up.
I've got a current production SA dydnohub with 90mm drum brake in a box, and it has equal size flanges. (Big)

the 70m drum is smaller , I have a SA 'Elite' from the UK era.. 2 decades of trouble free stopping.