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Old 09-28-07, 12:29 PM   #1
Tujunga Kid
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Sturmey Archer sprocket

Does anyone know where I could buy a 24 tooth (or more) sprocket for my Sturmey Archer AW hub?

I've read that SRAM/Sachs and even some Shimano sprockets will fit, but I've been unable to find anyone that sells individual sprockets.

Any advice would be most welcome.

Thanks,

Mark
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Old 09-28-07, 01:10 PM   #2
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http://sheldonbrown.com/harris/sturm...her-parts.html

The sprockets designated "HSL" are Sturmey Archer and are for 1/8" chain only. You can use eithe 1/8" or 3/32" chain with the others. The sprocket you get may not look like the picture. I ordered a 21 and got a nice chrome one.

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Old 09-28-07, 02:36 PM   #3
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With some file work, Shimano freehub cogs will go on. Hyperglide would look just plain silly, of course, so go to your (or your LBS) junk bin for a Uniglide if you can. 3/32 chain of course.

I did this to get a 30t cog on a rockcrawler (New Hampshire slickrock) bike I built 20+ years ago. Seemed to take a lot of torque being fed by a 39t chainring on a 7.5" Ashtabula forged crank, built into a 20" wheel. I can't say that it's still together (unlike a lot of my other stuff) because I moved a continent away after a couple years of riding it 2 hours a week.

Good luck

Mel
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Old 09-28-07, 04:56 PM   #4
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I have a 23 Shimano freehub cog on mine that works fine. You have to dremel down a couple of the notches to get it to fit, and its a little wobbly on the hub because its thinner than the SA cog, but functionally, it works fine.

Go to an lbs and they will probably give you an old one for free.
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Old 09-28-07, 06:37 PM   #5
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SA used to suggest not going below 2:1 chainring to cog because of excessive torque but were a little conservative IMHO.
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Old 09-28-07, 06:46 PM   #6
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Try Bikesmith Designs He is a member of this forum and actually welds up a large sprocket on a smaller one. Give him an email or pm. He is MnHPVA Guy here on the forums.

Aaron
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Old 09-28-07, 06:47 PM   #7
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Quote:
Originally Posted by LWaB View Post
SA used to suggest not going below 2:1 chainring to cog because of excessive torque but were a little conservative IMHO.
I was more worried about the cog/driver interface than the internals. FWIW, in my racing career I was a trackie who favored sprints.

Later

Mel
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Old 09-29-07, 09:22 AM   #8
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There were a couple on E Bay
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Old 09-29-07, 10:04 AM   #9
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Shimano Nexus cogs fit perfectly and are $5 each from Bikeman. Unfortunately, largest size seems to be 22-teeth: http://www.bikemannetwork.com/biking/p/FW7022

Neal
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Old 09-29-07, 10:10 AM   #10
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Shimano Nexus cogs fit perfectly and are $5 each from Bikeman. Unfortunately, largest size seems to be 22-teeth: http://www.bikemannetwork.com/biking/p/FW7022

Neal
From what I gather 24t sprockets have become somewhat of a scarcity, 22t still appear to be readily available. I am going to take a shot at using a Shimano Freehub cog like San Rensho suggested, I think you can minimize the wobble by using a couple of different sized spacers. I know I have seen at least 3 different sized spacers on the various SA hubs I have taken apart. There have been a couple of applications where a 26t or even a 28t would have been good to have.

Aaron
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