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  1. #1
    scrumtrulescent BestSportEver's Avatar
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    Friction shifting/ restoration project

    This is my new toy. I replaced brakes, cables, housing, tires, tubes, and chain. I even trued the wheels and repcacked all the bearings. I set out on my first ride and I shift into the largest cog in the back, smallest in front and right as I start to go up a hill WHAM ! the chain jumps off the crankset to the inside. nuts on bar = :-(

    I go back to the garage, tighten the friction shifter, make sure the FD is as close to the chain as possible without rubbing and that the front and rear cogs are in line (as much as they can be) and I set off again.... shift into the large cog in back - small in front - start to get of saddle to go up the hill and WHAM ! chain comes off the front again.

    What now?


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  2. #2
    You gonna eat that? Doohickie's Avatar
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    It sounds like your front derailleur is moving too far toward the small chainring. Adjust the L stop on the front derailleur until it just barely shifts to the small chainring.
    I stop for people / whose right of way I honor / but not for no one.



    Originally Posted by bragi "However, it's never a good idea to overgeneralize."

  3. #3
    scrumtrulescent BestSportEver's Avatar
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    I promise it is adjusted properly. It even rubs on it a little. it's not that it happens when I am shifting. It happens when I start to get out of the saddle and climb.
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  4. #4
    You gonna eat that? Doohickie's Avatar
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    Hmmmm.....
    I stop for people / whose right of way I honor / but not for no one.



    Originally Posted by bragi "However, it's never a good idea to overgeneralize."

  5. #5
    Kid A TurbineBlade's Avatar
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    Part of your post reads understandably, but the rest is confusing (at least to me).

    To adjust your FD, assuming your RD is already in adjustment, shift to your smaller chainring and largest rear cog -- adjust the low gear limit screw so that the FD is almost rubbing on the chain. It sounds like you did this..maybe? the confusing part is that you shouldn't have to adjust cable tension to do this, it is completely based on the movement of the FD. So, you could actually disconnect your FD cable and the FD should still not throw the chain on the inside.
    Cyclist, angler and aquarist

  6. #6
    scrumtrulescent BestSportEver's Avatar
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    Quote Originally Posted by TurbineBlade View Post
    Part of your post reads understandably, but the rest is confusing (at least to me).

    To adjust your FD, assuming your RD is already in adjustment, shift to your smaller chainring and largest rear cog -- adjust the low gear limit screw so that the FD is almost rubbing on the chain. It sounds like you did this..maybe? the confusing part is that you shouldn't have to adjust cable tension to do this, it is completely based on the movement of the FD. So, you could actually disconnect your FD cable and the FD should still not throw the chain on the inside.
    Again, it isn't the FD that is "throwing the chain" in. I can ride a long time with no problems, but as soon as I get out of the saddle and hammer down the chain jumps off.
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  7. #7
    Senior Member bikeman715's Avatar
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    check your BB and make sure it adjusted , it could be lose or the BB /frame is flexing to much when you are riding out of saddle.
    bikeman715

  8. #8
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    You said you replaced the chain, but not the rear set of cogs?

    Maybe the rear freewheel/cassette, or even one of your chain rings is to far worn down?

    I'm not an expert, but I've seen worn chainrings throw the chain under heavy torque before, with a new chain making things worse.
    Last edited by corkscrew; 02-22-11 at 04:17 PM. Reason: I can spell good.
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  9. #9
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    It does sound like a problem with something flexing under stress, rather than a DR adjustment problem. Nice-looking old Pugeot, BTW.

  10. #10
    Classics lover rob_g's Avatar
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    Beautiful bike, nice restoration work.

    I think corkscrew might have spotted the reason for your trouble.
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  11. #11
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    Quote Originally Posted by BestSportEver View Post
    Again, it isn't the FD that is "throwing the chain" in. I can ride a long time with no problems, but as soon as I get out of the saddle and hammer down the chain jumps off.
    What you still haven't answered is whether you've carefully checked that the FD low-limit screw is adjusted as far in as possible while still letting you shift to the small chainring. Yes, you can ride for a long time on the small ring with no problems, but when you stand and start hammering the extra force can cause the frame to twist slightly. That can affect the total distance from the shifter to the FD and therefore change the tension in the cable and result in a 'ghost' shift - in this case shifting right off the small ring. Having the limit screw turned in farther should prevent this from happening.

    Two other possibilities I can think of: 1) as mentioned earlier the small ring may be worn and allow the chain to ride up on the teeth when more torque is applied - that could then allow the chain to slip off to the inside, and 2) there could be some play in the bottom bracket so that when you press harder on the right pedal it makes the chainrings tilt to the right and again lets the chain slip to the inside.

  12. #12
    Senior Member cyclist2000's Avatar
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    try tightening the cranks. you could also try one of those dog fang's to keep the chain from jumping off but I am not sure if the dog fang's are only for granny gear on a triple.
    I don't do vintage, I bought them new, rode them, kept them. Now they are just old bikes
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  13. #13
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    Have you checked the crankset for a bent tooth?

  14. #14
    just pokin' along desertdork's Avatar
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    Quote Originally Posted by Steve530 View Post
    Have you checked the crankset for a bent tooth?
    That's what I was thinking. The OP has a close-up of the crank on flickr, and the teeth of the inner ring don't appear particularly worn.

  15. #15
    scrumtrulescent BestSportEver's Avatar
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    neither of the crankset rings are really worn and their are no bent teeth.
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  16. #16
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    Maybe there is a chainline issue. That can happen when setting up triples.

    Or, maybe the chain length isn't correct? If the chain is too long, I can see it falling off in certain gear combinations.

    Sweet bike, by the way.

  17. #17
    scrumtrulescent BestSportEver's Avatar
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    Quote Originally Posted by relyt View Post
    Maybe there is a chainline issue. That can happen when setting up triples.

    Or, maybe the chain length isn't correct? If the chain is too long, I can see it falling off in certain gear combinations.

    Sweet bike, by the way.
    Thanks... It's a double and the chainline isn't an issue. I am going to post some video on flick in a couple hours so everyone can see the chainline and shifting. Maybe someone will see something I am missing.
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  18. #18
    scrumtrulescent BestSportEver's Avatar
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    GREAT !!!! I loosened up the FD to straighten it up a little and when I barely started to tighten it look what happened. One problem turns into TWO. ...


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  19. #19
    scrumtrulescent BestSportEver's Avatar
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    Here is a video of my trying to make the chain jump off on the stand.

    http://www.flickr.com/photos/individ...ge/5469942362/
    Last edited by BestSportEver; 02-22-11 at 06:46 PM. Reason: vid
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  20. #20
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    Yes, unfortunately that's a common failure mode of the Simplex Prestige. Now that we know the type of derailleur, modify the above comments about checking the low-limit screw. This model only has a high-limit screw and the lower limit is adjusted by loosening the hex-head setscrew and moving the cage in or out on the pushrod.

  21. #21
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    Ack! I've heard good things about Simplex before, but quite frankly that FD is a pain to adjust before it cracks or gives somewhere.

    Is there a bicycle coop near you? I recently rebuilt a Peugeot with a similar FD, I ended up replacing it with a Suntour unit that adjusted in a more common fashion. =)
    Last edited by corkscrew; 02-23-11 at 12:21 AM.
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  22. #22
    scrumtrulescent BestSportEver's Avatar
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    Quote Originally Posted by corkscrew View Post
    Ack! I've heard good things about Simplex before, but quite frankly that FD is a pain to adjust before it cracks or gives somewhere.

    Is there a bicycle coop near you? I recently rebuilt a Peugeot with a similar FD, I ended up replacing it with a Suntour unit that adjusted in a more common fashion. =)
    I ordered a NOS one form ebay last night to keep things original looking. In the mean time I have super glued the old one back together.
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  23. #23
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    Eh, if period correctness is your thing, good on ya. I replaced the same model due to it only moving horizontally, and the fact that it's PITA to adjust. Besides, plastic bodies on MY derailluers? No thank you.

    But my goal was to just get the bike running, not appear classic, clean and original like you have done. Good work btw.
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  24. #24
    You gonna eat that? Doohickie's Avatar
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    You might try a Suntour derailleur until your new Simplex comes in; you should be able to get one locally from an LBS that has old parts bins.
    I stop for people / whose right of way I honor / but not for no one.



    Originally Posted by bragi "However, it's never a good idea to overgeneralize."

  25. #25
    scrumtrulescent BestSportEver's Avatar
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    Quote Originally Posted by Doohickie View Post
    You might try a Suntour derailleur until your new Simplex comes in; you should be able to get one locally from an LBS that has old parts bins.
    I am going to the CoOp to see what they have until my new one arrives. . I am already back on the road with it though. It took super glue and four zip ties, but hey, it still works.
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