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single speed/track chainrings on a double.....

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single speed/track chainrings on a double.....

Old 06-18-22, 08:46 AM
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ehcoplex
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single speed/track chainrings on a double.....

Trying to sort out gearing for a Holdsworth build. 144BCD Campy cranks. I think I can get the gearing I need/want with 42/46 in front and 13-32 freewheel, but the 144BCD chainrings I'm finding (at a reasonable $) are specified as 'track' rings. Track rings are 1/8", road/double/etc 3/32".... Is this likely to cause a problem? Will a 6-7-8 chain work, or is it too narrow for a 1/8" ring. Cyclone II mechs, friction, don't care about lack of ramps/pins, etc.
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Old 06-18-22, 08:58 AM
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Won't work. You need an 1/8" chain to run over the chainwheel. Too wide for the spacing of the freewheel.

I can't say I've ever tried to run 1/8" chain over the old freewheels but 3/32" chain was invented specifically for the job. I do know that a 3/32" chain will not sit down on an 1/'8" chainwheel or cog. The teeth are too fat to fit inside the links.
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Old 06-18-22, 09:02 AM
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Originally Posted by 79pmooney View Post
Won't work. You need an 1/8" chain to run over the chainwheel. Too wide for the spacing of the freewheel.

I can't say I've ever tried to run 1/8" chain over the old freewheels but 3/32" chain was invented specifically for the job. I do know that a 3/32" chain will not sit down on an 1/'8" chainwheel or cog. The teeth are too fat to fit inside the links.
as I feared/figured......
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Old 06-18-22, 09:58 AM
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interestingly enough there are such animals as 1/8" multispeed gear blocks

took in a Chiorda built Kmart derailleur five speed machine with such a drive train

1/8" Agrati Thun pattern chainset

1/8" drive chain

Regina 5V gear block with 1/8" cogs


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Old 06-18-22, 12:27 PM
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I presume this is, ahem, "interesting" on a 120mm rear hub? Or they built narrower rear hubs to accommodate this?

Originally Posted by juvela View Post
interestingly enough there are such animals as 1/8" multispeed gear blocks

took in a Chiorda built Kmart derailleur five speed machine with such a drive train

1/8" Agrati Thun pattern chainset

1/8" drive chain

Regina 5V gear block with 1/8" cogs
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Old 06-18-22, 01:30 PM
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had no occasion to measure OLD of rear hub

frame spacing as recalled was 120mm


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