Singlespeed & Fixed Gear - Ghost in the Machine
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Down near the bottom of the page. Underneath "conversion." Has anyone heard of or seen this "ghost" chainring? (http://www.answers.com/main/ntquery;jsessionid=44cocqd5qulkb?method=4&dsid=2222&dekey=Fixed-gear+bicycle&gwp=8&curtab=2222_1&sbid=lc03a&linktext=fixed-gear%20bicycles)
Can that really be used to tension the chain?
11-21-05, 01:14 PM
Yes. I did it once but I didn't trust it. Probably better for SS than fixed.
11-21-05, 01:20 PM
sounds like he's trying to say a singulator or some such device but i really have no idea.
Sounds like just another word for tensioner. In which case, it would be really dumb to try it with a fix...
11-21-05, 01:51 PM
he's talking about a phantom gear. #8 on this list:
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.
11-21-05, 01:57 PM
i think it's nifty, but i'm not about to run home and try it.
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.
for the ghost chainring in action:
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.
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.
11-21-05, 07:09 PM
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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