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Old 09-25-10, 11:20 PM   #1
Dave1899
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18 tooth cog for a Raleigh Twenty

Where can I get an 18 tooth cog to fit my SA 3spd hub and do I need any special tools to change it out? Also, would I need to add any links to the chain?
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Old 09-25-10, 11:25 PM   #2
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SA still makes new cogs in a wide range of sizes and you can order one of those or if you have a bike co-op you might find one there... the stock cog is a 15 so you will need a longer chain and the chain length and dropout design on the Twenty really works better with an even / odd combination.

The dropout is short and is angled upwards so there is not a lot of room to play with chain tension... a 17 or 19 would be an easier switch.
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Old 09-26-10, 06:31 AM   #3
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SA still makes new cogs...
...and in fact S-A cogs for their 2-3-4-5&7 speed hubs are interchangeable with Shimano cogs for their 3-4-7&8 speed hubs which are interchangeable with SRAM (F&S) cogs for their 2-3-5&7 speed hubs which are interchangeable with the cogs for many single-speed coaster brake hubs. These cogs have been an industry standard for some 60 years. You pop the retaining ring off with a flat blade screwdriver to change 'em out.

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...and dropout design on the Twenty really works better with an even / odd combination. The dropout is short and is angled upwards so there is not a lot of room to play with chain tension... a 17 or 19 would be an easier switch.
If an 18 will give you your most optimum gearing, use a half link.

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Old 09-26-10, 06:36 PM   #4
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I put a 19 on mine and had to use a half-link.
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Old 09-26-10, 06:38 PM   #5
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I put a 19 on mine and had to use a half-link.
How'd that 19 work for you?
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Old 09-26-10, 09:07 PM   #6
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It works just fine. I leave it in 2nd gear for pootling along the MUP and it's perfect for that. In general I like my bikes geared towards the low end as I'm not a speed demon.
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Old 09-26-10, 09:46 PM   #7
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There is some variation in chain stay lengths between different 20's... this will effect how certain chain ring and cog combinations work.
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Old 09-29-10, 03:00 PM   #8
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http://cgi.ebay.co.uk/ws/eBayISAPI.d...:MEWNX:IT#shId
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