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  1. #1
    RFC
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    Senior Member RFC's Avatar
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    Single Chainring Geared Bikes -- any advice?

    I'm thinking about modifying my now SS Volpe into a geared bike with a single chainring. Do I need to worry about a chain guard of the big ring?

    Thanks

    RFC

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    Senior Member auchencrow's Avatar
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    I am not clear on your question - Do you mean the big cog?

    If so, I would think you may have the raise the chain guard at the rear a little, in the event that you get chain slap due to it's closer proximity when in low gear.
    - Auchen

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    Senior Member ftwelder's Avatar
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    Quote Originally Posted by RFC View Post
    I'm thinking about modifying my now SS Volpe into a geared bike with a single chainring. Do I need to worry about a chain guard of the big ring?

    Thanks

    RFC
    I have an old Carlton Corsair that is a five speed from the factory. I have noticed that I am able to sprint and pedal over bumps but there is a tendency for the chain to derail going from a fast cadence to "stopped" or slowing too fast. I have found it generally better to keep a very low pedaling cadence with a 5-speed .
    1886 Surrey machinists Invincible, 1900 Nashua, 1937 Raleigh Golden Arrow, 1938 Raleigh Silver Record, 1951 Armstrong tourmalet, 1970 Motobecane Grand Record, 1971 Raleigh Professional, 1971 Gitane TDF, 1972 Legnano Gran Primio, 1973, Peugeot PX-10, 1975 Roberts, 1984 Battaglin Giro, 1985 Grandis Speciale, 2012 FTW

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  4. #4
    Wookie Jesus inspires me. Puget Pounder's Avatar
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    If you're talking about a guard to prevent dropping when you cross chain then I would suggest you get one. I built a bike like that and it dropped frequently over bumps or a quickshift throughout the range even with the chainline in the dead center of the cluster. I used a front derailleur to keep the chain and it worked perfectly. Some people get away without it though.

    But I am not sure that's what you're asking...

  5. #5
    Senior Member Grand Bois's Avatar
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    It's clear enough to me. Try it and see if the chain drops. If so, there are a few fixes, the simplest of which is an immobilized front derailer.

    I'm not sure if it made a difference that I used a Simplex derailer with a sprung top pivot, but seemed to keep a lot of tension on the chain. I never had the chain drop. Peugeot built a lot of five speeds with Simplex derailers.


    Last edited by Grand Bois; 05-11-11 at 06:38 PM.

  6. #6
    Oh Snap, not again... atmdad's Avatar
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    Quote Originally Posted by Grand Bois View Post
    Try it and see if the chain drops. If so, there are a few fixes, the simplest of which is an immobilized front derailer.
    Exactly. I have my beater/grocery getter 5 speed with a 50 up front and 14-28 rear with no problems. My daughters bike, very similar but with a 44 I believe up front and she would drop the chain. A fixed front derailer up front solved it.

  7. #7
    Senior Member mazdaspeed's Avatar
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    I've had good luck with 39x8

  8. #8
    Senior Member formicaman's Avatar
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    There's always internal hubs.

  9. #9
    Is a real super guy. Henry III's Avatar
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    I was thinking of doing the same thing with my World Sport frame for a CX build. I have a pair of NR cranks but only a 42T chainring for it. Then I'd run a 5 or 6 speed freewheel in the rear. I was wondering if I'd have problems with dropping the chain also. Guess I'll just have to find out.

  10. #10
    Wood David Newton's Avatar
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    I am contemplating doing the same thing, I'll have a 42 x 14-28 fw. I suspect chain length and RD spring tension will be key factors.
    I imagine the shortest chain that will do the job is best.
    http://davidnewtonguitars.squarespace.com/

  11. #11
    Senior Member southpawboston's Avatar
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    I have a 45 x 13-30. I've never had the chain drop. I supposed if there's not enough chain tension, it could be an issue.

  12. #12
    Get off the lawn! Velognome's Avatar
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    FWI- I rode a UO9 for years with only a RD, making it a 5 spd. Kept the Chain on the large ring and never had a problem with the chain drop or with cross over.

  13. #13
    French threaded PDXaero's Avatar
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    Quote Originally Posted by Velognome View Post
    FWI- I rode a UO9 for years with only a RD, making it a 5 spd. Kept the Chain on the large ring and never had a problem with the chain drop or with cross over.
    Same here. A 5 speed uo-09 because the front deraillieur was broken when I got it. My first road bike. *daydreaming*
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  14. #14
    RFC
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    All good advice. Thanks. Seems like chain/RD tension may be a clue. In other words, "make that derailleur scream!"

  15. #15
    Get off the lawn! Velognome's Avatar
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    Originally Posted by Velognome
    FWI- I rode a UO9 for years with only a RD, making it a 5 spd. Kept the Chain on the large ring and never had a problem with the chain drop or with cross over.



    Same here. A 5 speed uo-09 because the front deraillieur was broken when I got it. My first road bike. *daydreaming*
    All good advice. Thanks. Seems like chain/RD tension may be a clue. In other words, "make that derailleur scream!"
    Or speak French

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