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Old 07-25-07, 06:23 PM   #1
closetbiker
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3 speed hub on road bike

My rear wheel needs to be replaced on my wet weather commuter (an old Vitus 172 road frame) and I thought of going to a Nexus 7 speed internal hub.

It's pretty expensive and my commute is on flat roads, so then I thought I might be able to find an old 3 speed hub cheaper that might give me good enough gears for the flats.

Does anyone know what kind of gear development those old hubs give (and consider it'll be a 700 c wheel with a chain ring of either 42 or 48)?

I think I'd like a 60 to 90 inch range in the 3 gears. Is that reasonable?
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Old 07-25-07, 07:06 PM   #2
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That's perfectly reasonable. A Sturmey Archer AW or clone would do well, if a bit widely spaced in gearing. The ratios are 3:4, 1:1, and 4:3, so with a 42 chainring and 16 cog (you have the option of several from around 16 up to 22 or so), you'd have 52, 70 and 93 inches on a 700c. 48x18 would net you similar results, within an inch or so.
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Old 07-25-07, 07:22 PM   #3
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thanks!
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Old 07-25-07, 09:21 PM   #4
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I'm working on a 3 speed roadbike conversion now. I'm using one of the new SA hubs. It has an aluminum shell with thicker flanges so you don't snap spokes. Aebike is selling them for $53 with shifter and cable. I'm going to try a 21t cog and a 52t ring and see how it works for me. That will give me 49.7, 66.3 and 88.3 gear inches with a 700X28.
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Old 07-26-07, 12:35 PM   #5
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How narrow of a chain will the cogs handle?
I know on my old Shimano 333, that the cogs were too "thick" to handle 7 speed chain.
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Old 07-26-07, 12:51 PM   #6
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According to Sheldon Brown's site, SA cogs use 1/8" chain. SRAM and Shimano cogs use 3/32" chain. The picture shows a Regina chain on a modified 8 speed cassette cog. I don't know why a 7 speed chain wouldn't work on a Shimano 3 speed cog. A 7 speed chain should work on any cog Made for 3/32" chain. Are you sure you didn't have SA cog on your Shimano hub? They fit.

Last edited by Grand Bois; 07-26-07 at 01:02 PM.
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Old 07-26-07, 01:13 PM   #7
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You can always run a 1/8th chain on 3/32 parts just not the other way around.
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Old 07-26-07, 01:23 PM   #8
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Quote:
Originally Posted by the royal 'we' View Post
That's perfectly reasonable. A Sturmey Archer AW or clone would do well, if a bit widely spaced in gearing. The ratios are 3:4, 1:1, and 4:3, so with a 42 chainring and 16 cog (you have the option of several from around 16 up to 22 or so), you'd have 52, 70 and 93 inches on a 700c. 48x18 would net you similar results, within an inch or so.
The Shimano 3 speed is even wider at 11:15, 1:1, 15:11 or 186% vs 178%, but it may only come with a coaster brake (hard to tell from Shimano's site.)
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Old 07-26-07, 01:58 PM   #9
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You can always run a 1/8th chain on 3/32 parts just not the other way around.
I thought that was a given.
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