Shimano Alfine chain tensioner
03-17-12, 07:19 PM
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Shimano Alfine chain tensioner
Need information on using an Alfine to swing a 50/34 front chain rings with a single speed hub and vertical dropouts? Will this work?
03-17-12, 09:49 PM
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No. Like all spring arm tensioners the Alpine is designed to tension a chain after it was been made as short as possible, not to take up chain wrap like a derailleur. The device you will need is a Paul Melvin. The Melvin has a 20T chain wrap so it will handle the 16T warp your setup will require. Of course you could also use a derailleur (modified for SS or not) , but what fun would that be.
Last edited by onespeedbiker; 03-17-12 at 10:17 PM.
03-18-12, 12:29 AM
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Alfine CT-S500 max front tooth difference is 16t.
Alfine CT-S510 is for single front chainwheels only.
Last edited by hartsu; 03-18-12 at 12:44 AM.
03-18-12, 06:10 AM
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The ct-s500 is the one I have, I was building a bike that hadn't been ridden in years. I have been riding single speed bike's off road for the past 7-8 years and thought something with 2 speeds would be nice to ride to the trailhead than switching to the lower trail gears. All the parts are from my "spare parts bin"
Last edited by BBQ Biker; 03-18-12 at 06:13 AM. Reason: Spelling
03-18-12, 02:25 PM
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The ct-s500 is the one I have, I was building a bike that hadn't been ridden in years. I have been riding single speed bike's off road for the past 7-8 years and thought something with 2 speeds would be nice to ride to the trailhead than switching to the lower trail gears. All the parts are from my "spare parts bin"
03-18-12, 03:09 PM
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that is the simpliest way to do it. plus it really confuses people
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03-18-12, 05:08 PM
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03-19-12, 06:03 AM
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03-19-12, 09:05 AM
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The wheels are 700c w/ x32 tires. the rings are sort of a halfstep plus granny 48/42/28
The frame is from european market and was marketed as a cyclocross bike.
The frame is from european market and was marketed as a cyclocross bike.
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03-21-12, 06:24 AM
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Thanks to all that replied. I'll keep you posted on my results, restaurant business doesn't leave much time for bike tweaking 
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