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Old 05-11-11, 05:20 PM   #1
RFC
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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

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Old 05-11-11, 05:30 PM   #2
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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.
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Old 05-11-11, 06:12 PM   #3
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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 .
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Old 05-11-11, 06:15 PM   #4
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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...
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Old 05-11-11, 06:24 PM   #5
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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.



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Old 05-11-11, 06:32 PM   #6
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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.
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Old 05-11-11, 06:46 PM   #7
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I've had good luck with 39x8
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Old 05-11-11, 07:03 PM   #8
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There's always internal hubs.
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Old 05-11-11, 07:48 PM   #9
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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.
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Old 05-11-11, 08:00 PM   #10
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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.
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Old 05-11-11, 08:11 PM   #11
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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.
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Old 05-11-11, 08:33 PM   #12
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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.
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Old 05-11-11, 08:43 PM   #13
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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.
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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Old 05-11-11, 11:07 PM   #14
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All good advice. Thanks. Seems like chain/RD tension may be a clue. In other words, "make that derailleur scream!"
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Old 05-12-11, 06:26 AM   #15
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Quote:

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*
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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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