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Raleigh Twenty build - Help needed
Greetings,
I am new to the group and am hoping someone can help me. I am rebuilding an early 70's Raleigh Twenty including front fork, tire, handlebars and S-A 3-speed hub. My concern is that the 3 speed hub will not be enough for local terrain and I would like to update the gearing without big money. i.e. no SRAM Dual-Drive 3x9 What is the best way to get a rear derailleur gearing onto the SA hub? The SA uses a 3 spline system, but I doubt I can jam on many extra sprockets... on extra maybe? Anyone tried this? Any advice is greatly appreciated... Mord |
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#2
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Raleigh Twenty build - Help needed
Mordechai wrote:
What is the best way to get a rear derailleur gearing onto the SA hub? The SA uses a 3 spline system, but I doubt I can jam on many extra sprockets... on extra maybe? Anyone tried this? Any advice is greatly appreciated... I was recently able to find an old "threaded driver" for a Sturmey-Archer hub. I was in the type of bike shop that has spare recycled parts from the 1950s. The driver is the component that holds the rear cogs, and transmits their torque to the hub's internals. A threaded SA driver has no splines. Instead it's got the same thread size as a standard freewheel. My plan is to use this to splice a freewheel onto a 3 speed, but I haven't taken the time to do it yet. You might try the same tactic. - Frank Krygowski |
#3
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Raleigh Twenty build - Help needed
On Fri, 25 Nov 2005 21:45:47 GMT, Frank Krygowski
wrote: Mordechai wrote: What is the best way to get a rear derailleur gearing onto the SA hub? The SA uses a 3 spline system, but I doubt I can jam on many extra sprockets... on extra maybe? Anyone tried this? Any advice is greatly appreciated... I was recently able to find an old "threaded driver" for a Sturmey-Archer hub. I was in the type of bike shop that has spare recycled parts from the 1950s. The driver is the component that holds the rear cogs, and transmits their torque to the hub's internals. A threaded SA driver has no splines. Instead it's got the same thread size as a standard freewheel. My plan is to use this to splice a freewheel onto a 3 speed, but I haven't taken the time to do it yet. You might try the same tactic. If you're going this route and run into problems, talk to Sheldon. He's been there and done that. But basically, if you're trying to restore the bike, don't do this, just refurb the SA and ride it as is. If you're after a good modern-ish equipped bike, start with something else, or ditch the SA and put on full derailer gearing. Either the 3x7 or the derailer gear option will require you to spread the frame, and do a lot of extra work, to end up with a frankenbike. If you're after a frankenbike because you enjoy the idea of one, go for it, but it won't look much like an old Raleigh Roadster. Jasper |
#4
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Raleigh Twenty build - Help needed
I hunted around for a threaded driver around the LBS and came up empty.
I really want to keep the SA hub so I'll just ride it as is with new front end. It still may need conversion to 3/32" if the bottom bracket goes but til then we'll see. Maybe once I've ridden a few hundred I won't mind the available gearing. My main reason for rebuilding it is to have an unusual bike that is not like every other cycle on the road. BTW it's a Twenty folding bike. Thanks for the ongoing help, Mord |
#5
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Raleigh Twenty build - Help needed
Mordechai wrote:
Greetings, I am new to the group and am hoping someone can help me. I am rebuilding an early 70's Raleigh Twenty including front fork, tire, handlebars and S-A 3-speed hub. My concern is that the 3 speed hub will not be enough for local terrain and I would like to update the gearing without big money. i.e. no SRAM Dual-Drive 3x9 What is the best way to get a rear derailleur gearing onto the SA hub? The SA uses a 3 spline system, but I doubt I can jam on many extra sprockets... on extra maybe? Anyone tried this? Raleigh offered optional six and nine speed conversion kits for that hub. You can remove the HMW-127 spacers on either side of the sprocket and install two beveled Sturmey sprockets on the driver facing away from each other ( sizes over 15 are beveled) to make a six. You'll need a chain a couple links longer, a shifter and a changer - one which allows a washer on either side of the rollers to accommodate your wide chain . So yes, there's one relatively cheap and simple method. Many others abound. But did you consider just swapping the cog size , that is , just a lower geared three speed? -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
#6
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Raleigh Twenty build - Help needed
Well, being a Twenty Folder the 20" inch wheel size means that the rear
sprocket is already a 16T. So if I add another I'm only gearing down. Once I've ridden it some I'll consider replacing the 16T with a 14T single and forget 3 gears. Thanks again, Mord |
#7
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Raleigh Twenty build - Help needed
On Sun, 27 Nov 2005 02:02:11 -0600, A Muzi wrote:
Raleigh offered optional six and nine speed conversion kits for that hub. You can remove the HMW-127 spacers on either side of the sprocket and install two beveled Sturmey sprockets on the driver facing away from each other ( sizes over 15 are beveled) to make a six. You'll need a chain a couple links longer, a shifter and a changer - one which allows a washer on either side of the rollers to accommodate your wide chain . What about the 9 speed version, how did that work? Jasper |
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Raleigh Twenty build - Help needed
On Sun, 27 Nov 2005 02:02:11 -0600, A Muzi wrote:
Raleigh offered optional six and nine speed conversion kits for that hub. You can remove the HMW-127 spacers on either side of the sprocket and install two beveled Sturmey sprockets on the driver facing away from each other ( sizes over 15 are beveled) to make a six. You'll need a chain a couple links longer, a shifter and a changer - one which allows a washer on either side of the rollers to accommodate your wide chain . Jasper Janssen wrote: What about the 9 speed version, how did that work? Both the six and the nine, made by Cyclo, came as a kit in an impossibly small box with a few chain links, shifter, full casing gear cable, chainstay cable stop, Cyclo changer with pullchain and a proprietary double or triple cog assembly designed to slip on a splined driver with the standard circlip. Those cog assemblies had a relatively thin interface still allowing some chainline adjustment (spacer-spacer-cog, spacer-cog-spacer, cog-spacer-spacer) (the kits were cheap -$10 or $12 when a basic rear changer cost $6) As Frank noted, a threaded driver is a good start to using a blocked freewheel. The freewheel body can be brazed or welded together. Tinkerers have always been drawn to those. Phil Van Valkenburg's Ultimate Peugeot used a threaded driver with a 4 speed Regina freewheel on his Sturmey S-5 hub with a triple TA Cyclotouriste triple. . . you get the idea I'm sure other paths exist. 2 Sturmey cogs back-to-back is probably the simplest but as always riders have various criteria and resources so YMMV. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
#9
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Raleigh Twenty build - Help needed
Is it straight-forward then to put a standard freewheel onto the threaded SA driver, re-dish the wheel and mount it all up? If this is requires no brazing/welding I'd be more interested in pursuing it. Seems like this may be the simplest way, even if it takes a while to find the parts. Mord |
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