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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 11-21-05, 01:07 PM   #1
heebro
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Ghost in the Machine

Down near the bottom of the page. Underneath "conversion." Has anyone heard of or seen this "ghost" chainring?

Can that really be used to tension the chain?
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Old 11-21-05, 01:14 PM   #2
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Yes. I did it once but I didn't trust it. Probably better for SS than fixed.
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Old 11-21-05, 01:20 PM   #3
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sounds like he's trying to say a singulator or some such device but i really have no idea.
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Old 11-21-05, 01:21 PM   #4
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Sounds like just another word for tensioner. In which case, it would be really dumb to try it with a fix...
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Old 11-21-05, 01:51 PM   #5
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he's talking about a phantom gear. #8 on this list:

http://www.mtbr.com/faq/ssfaq.shtml#...nsChainTension

The middle chainring just floats there, turning the same direction as both other rings. By choosing the phantom gear correctly, you can theoretically use any chainring/cog combo on vertical drops. I tried it on a trials bike once, but the chain would skip off too much for my liking.
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Old 11-21-05, 01:57 PM   #6
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i think it's nifty, but i'm not about to run home and try it.
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Old 11-21-05, 02:12 PM   #7
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The amount of work it takes to dial-in your ghost chainring to the point where it doesn't pop out of the chain negates its utility, as you could spend less time dialing in the other parts of your drivetrain for a better fit.
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Old 11-21-05, 02:15 PM   #8
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for the ghost chainring in action:

http://forums.mtbr.com/showthread.php?t=145692

personally, i think it looks very cool, but i'd worry about using it to tension a fixed gear.
if the ghost ring had really tall teeth, and you could squeeze it close to the cog, possibly.
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Old 11-21-05, 06:29 PM   #9
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Note: Your gearing (angle of chain) and the size of the phantom chainring can really affect the performance of the setup - a phantom chainring can greatly reduce the number of engaged teeth on the cog. As someone else said, it makes the chain skip over the teeth. Probably no worse than running a tensioner in "push-down" mode, but I've seen skipping w/ that setup as well, which is why people like to run "push-up" - more engagement. But I digress.
Also, I second the comment about it being more appropriate for SS than FG.
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Old 11-21-05, 07:09 PM   #10
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if you click on the picture it is captioned, "A road bicycle frame converted into a fixed gear." but those look like horizontal "drops" to me. do they make road bikes with track fork ends?? or maybe i'm missing something.
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