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  1. #1
    Senior Member closetbiker's Avatar
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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?

  2. #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.

  3. #3
    Senior Member closetbiker's Avatar
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    thanks!

  4. #4
    Senior Member Grand Bois's Avatar
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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.

  5. #5
    Senior Member Bill Kapaun's Avatar
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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.

  6. #6
    Senior Member Grand Bois's Avatar
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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.

  7. #7
    Team Beer Cynikal's Avatar
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    You can always run a 1/8th chain on 3/32 parts just not the other way around.

  8. #8
    Senior Member keraba's Avatar
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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.)

  9. #9
    Senior Member Grand Bois's Avatar
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    Quote Originally Posted by Cynikal View Post
    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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