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A couple of things the other posts on the subject didn't mention. An FW mech will fit in a pre-1985 AW (three-speed) shell so if you have a 3-speed you want to make into a 5 speed all you need is to do is put in the FW guts. (And a good half of the FW parts are the same as the AW). (You do need the old style FW sun gear to get the top gear to work)
If you have the short-axle version of the FW without enough threads to fit a bellcrank
you can use the Lauterwasser workaround detailled in Tony Hadland's "The Sturmey Archer Story" Some MIT guys converted their FWs to S5s this way even before the S5s appeared. Run the left- hand shifting cable along the chainstay through a guide or two and then through a hole in a nut or cable knarp attached to the pushrod and attach the cable straight behind the dropout. Lauterwasser used a teardrop-shaped brass washer to attach the cable to (picture in Sturmey Archer Story). When the cable is tight it pushes in the pushrod selecting the other sun gear. There's an example (functional but not elegant) half way down this page: http://www.bicyclehub.co.uk/index.php?option=com_content&view=article&id=31&Itemid=105
There used to be some views of more elegant version on the web of a 1949 Ernie Clements Wrekin Lauterwasser 5-speed conversion.... I converted my '72 Raleigh Sports to a 5 speed this way. It works quite well without a bellcrank. It's nice to have the wider range of gears in Seattle...
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Mark Stonich;
BikeSmith Design & Fabrication
5349 Elliot Ave S. Minneapolis, Minnesota 55417 USA
Ph. (612) 824-2372 http://bikesmithdesign.com
I know and appreciate we're supposed to "suffer for our art", but wouldn't an easier route just be to put a modern RF5 internal in the hub shell? Heaps more reliable, ten minutes to perform, and spare parts not an issue. Being a single cable, all that's then required is a new shifter. The SLS50T5 isn't entirely ugly on an old bike.
Graham, of the won't suffer for art!
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| I believe fitting a spring inline on the left-hand, high/low-range, side is a great help too? Alan Lloyd Schaumburg, Illinois, U.S.A. --- On Sat, 5/5/12, Luckyrob <ral...@shaw.ca> wrote: |
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I bought my first English bicycle in April 2006 for my first 3 speed tour (thank you Noel), a 1967 green Raleigh Sprite 5 speed. Shifters didn’t work well, 19 tooth sprocket, and poor brakes. I followed the advice of the experienced and changed out the shifters to the left friction and the usual 3 speed trigger; then a 26 tooth sprocket and salmon brake pads from an old 10 speed. The bike can climb any hill! Even stop. The spring on the hi/low side came later and dramatically smooths the shifting, and I seem to have less slipping out of range.
The Sprite has been an excellent ride and now I have an identical ladies bike for my wife to ride. Mine even won the Gravity Race and Pastry Joust at the ’06 ABCE…something I have attempted to re-live every year since…and failed…L…I occasionally mumble to myself that if I had to keep one bicycle it would be this one…wish it was red or something tho’…
Ian Lindridge
Riding a bicycle makes me feel younger, getting off makes me feel older, starting off again makes me long for death.
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| You just put a strongish spring inline between the cable and the bell-crank (S5) or indicator chain (S1 or S2) at the back wheel. I think this was what Raleigh themselves did on the 2x3=5-speed Choppers, because they had bloody great levers and it was kidz doing the shifting. Me-thinks Ian Lindridge might actually have a picture of one of his installations? Or Mark Stonich? |
Alan Lloyd Schaumburg, Illinois, U.S.A. |
| --- On Wed, 5/9/12, Luckyrob <ral...@shaw.ca> wrote: |
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