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Thread: magic ratio

  1. #1
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    magic ratio

    is this tension fine or too loose? thx
    Attached Thumbnails Attached Thumbnails magic ratio-img384.jpg  


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    As long as your chainline is good, you should be fine.

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    could it get more loose? i only used it for 25 kms. thx

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    Definitely too loose. Maybe add a tooth to the cog out back if you're wanting an easier gear or a tooth to the ring if you're wanting a harder gear.

    Can you take the chain off the ring/cog with your bare hands? If so then your tension is too loose and the chain might come off on its own when bouncing around.

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    Quote Originally Posted by Markleo View Post
    could it get more loose? i only used it for 25 kms. thx
    As the chain "stretches", it will probably get more loose. Then at that point, just install a half-link.

    My chain is a tiny bit more loose than yours. No issues with mine, though, even running through some rough stuff. Looks like yours is a roadie, so you won't have issues. Just make sure that chainline is good.

  6. #6
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    Quote Originally Posted by GTscoob View Post
    Definitely too loose. Maybe add a tooth to the cog out back if you're wanting an easier gear or a tooth to the ring if you're wanting a harder gear.

    Can you take the chain off the ring/cog with your bare hands? If so then your tension is too loose and the chain might come off on its own when bouncing around.
    if i add an 18t at the back (now its a 17t), it gets too tight. no tension at all. is that better?

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    No disrespect to GTScoob, but again, that is not too loose.

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    Quote Originally Posted by phsycle View Post
    No disrespect to GTScoob, but again, that is not too loose.
    Eh not wanting to get into a pissing contest but I wouldnt ride a chain that loose. Maybe for pavement or a beach cruiser that would be fine but I wouldnt trust it to stay on the rings riding through east coast gnar. If your chain is this loose you've got an issue with your setup, talking to both of you here.

    Does look like a great candidate for a ghost ring. Grab the 22T or 24T granny ring and see if you can put it between the upper and lower runs of the chain, right in front of the cog, it should tension the chain a little better and look cool.

    Or run that 18T cog and do the Sheldon Brown trick of filing down the dropouts a hair to tension the rear wheel.

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    Quote Originally Posted by GTscoob View Post
    Maybe for pavement or a beach cruiser that would be fine.
    Did you look at his tires?

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    does this look better?
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    magic ratio

    Quote Originally Posted by Markleo View Post
    does this look better?
    No. It looks worse.
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    Any suggestions. appart from adding a tensioner

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    Get a half link.

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    I'd be more comfortable with a little more tension and go with a Gusset Half link.

  15. #15
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    magic ratio

    Quote Originally Posted by Markleo View Post
    Any suggestions. appart from adding a tensioner
    ENO rear hub.
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    Quote Originally Posted by goldenaustin View Post
    I'd be more comfortable with a little more tension and go with a Gusset Half link.
    Yried it. doesnt work. too much of a fuss to change hub. so it either the first pic 44:17 or the 2nd 42:15

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    Quote Originally Posted by Markleo View Post
    Yried it. doesnt work. too much of a fuss to change hub. so it either the first pic 44:17 or the 2nd 42:15
    Curious, but how didn't a half link work? If it doesn't work with your current gear ratio, I'd think you'd be able to fix that with changing front ring or rear cog, but the advantage is that the change will be smaller than sticking with all full links.

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    Quote Originally Posted by Markleo View Post
    Yried it. doesnt work. too much of a fuss to change hub. so it either the first pic 44:17 or the 2nd 42:15
    It seems some here wouldn't have a problem with it but no way would I ride either of those, though the first combo looks better. Guess I'm just a wuss.

    A tensioner may be ugly but so is road rash.

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    Quote Originally Posted by goldenaustin View Post
    Curious, but how didn't a half link work? If it doesn't work with your current gear ratio, I'd think you'd be able to fix that with changing front ring or rear cog, but the advantage is that the change will be smaller than sticking with all full links.
    When add halflink the chain qr needs 2-3 mm to close. otherwise the chain is too tight.

  20. #20
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    "Ghost Rings' - do they work?

    Play around with this if you dont want a tensioner. Otherwise an ENO hub is your only play. Or a Paul eccentric BB. Or a SS frame.

    Have you tried the 44:15 or 42:17 combos? You look pretty close in the first pic.

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    No luck with the 42:17 i havent tried 44:15 i worry it would be too hard, although it might work.

  22. #22
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    the ghost ring is an interesting concept.

  23. #23
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    Use the 18t and file your axle a bit.
    everything sucks but my vacuum cleaner.

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    Ot looks like 44:15 and halflink works. now i will have to see if i can climb those hills with such a gear

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    Best (to me) option is a Phil Wood adjustable bottom bracket (IMHO the best designed bike product I've seen). Run the ratio you want at the tension you need.

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