A preliminary search has found a few snippets of info but nothing comprehensive on a bike I've just acquired. The bike is a Trevor Jarvis Flying Gate - I have its provenance and know that it was bought as a frame and forks only from Trevor in late 1982/early 1983 - so the owner obviously built it up himself (or his LBS)
What is foxing me is the gears - it has :
1 a Sturmey Archer 5 speed hub with "S5.2" stamped on it, together 83 - 2 (the shell is the engraved style, not the printed on lettering) with 2 sprockets and chain pulling thing for the changer on both sides of the axle
2 a Suntour derailleur that, obviously, shifts the chain from one sprocket to the other
There is a dual lever attached to the stem - the LH side lever connects to the changer on the left side of the axle; the RH side lever connects to the Suntour. There is also a Sturmey Archer trigger that connects to the RH side of the axle.
So, I assume that if the hub is a 5 speed, then the bike is a 10 speed.
What is also odd is that the hub has a separate alloy flange bolted to it. It's like a giant allow washer that is bolted, with small bolts, through alternate spoke holes on the hub flange - and has a set of spoke holes on its outer edge - and the wheel is laced as normal with short-ish spokes. I've never seen anything like it before - the flange is odd, the only possible reasons I can think of are that a) the wheel could be stiffer with shorter spokes, or b) it makes changing a broken spoke a lot easier (esp the sprocket side)
I've posted a few pictures on my website at : http://www.beewee.org.uk/index.php?opti ... Itemid=106
I'd really appreciate some thoughts on what it's all about ... and my decision has to be made on whether to abandon all this hub stuff and fit conventional cassette/mechs when I refurb it over the winter.