Front derailleur shifting on rollers
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  1. #1
    What the what???
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    Front derailleur shifting on rollers

    I知 assuming it has to be operator error, but I have a bike with a front derailleur that shifts fine in the stand... fine on the road... but when I知 riding on rollers it will not shift into the big ring. I致e tried different combinations of speed and power before and during the shift, but no luck so far.

    Anyone else experienced this?


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  2. #2
    'brifter' is a lame word.
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    I've definitely seen that happen on trainers when riders are pedaling low cadence/big gear. Just happened yesterday...bike wouldn't go up to the big ring on the trainer, put it in the stand, no problem. On the road, no problem. Rollers...that's not happened that I can remember. I suppose you could be just a tiny big low on cable tension or the high limit is just a tiny bit tight.
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  3. #3
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    Quote Originally Posted by cxwrench View Post
    I've definitely seen that happen on trainers when riders are pedaling low cadence/big gear. Just happened yesterday...bike wouldn't go up to the big ring on the trainer, put it in the stand, no problem. On the road, no problem. Rollers...that's not happened that I can remember. I suppose you could be just a tiny big low on cable tension or the high limit is just a tiny bit tight.
    I値l try a little nudge to each and see if I can make it work. Thanks.


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  4. #4
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    What CX says with a reason. You are riding a vintage steel frame? If so, you definitely don't get the same frame flex as you would on the roads, you'd be on the floor with that much torque on the frame I bet. A 1/4 turn might be enough, not enough or too much. Give it a shot.
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  5. #5
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    Front derailleur shifting on rollers

    Quote Originally Posted by Touch0Gray View Post
    What CX says with a reason. You are riding a vintage steel frame? If so, you definitely don't get the same frame flex as you would on the roads, you'd be on the floor with that much torque on the frame I bet. A 1/4 turn might be enough, not enough or too much. Give it a shot.
    Not steel for this one. Titanium.

    I had wondered if there was an odd spot where no resistance (in the stand) let it shift fine... and considerable resistance (on the road) let it shift fine... but the rollers maybe smoothed things out just enough to cause a problem???

    Sort of a 喪everse Goldilocks...


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  6. #6
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    Quote Originally Posted by Opus51569 View Post
    Not steel for this one. Titanium.

    I had wondered if there was an odd spot where no resistance (in the stand) let it shift fine... and considerable resistance (on the road) let it shift fine... but the rollers maybe smoothed things out just enough to cause a problem???

    Sort of a 喪everse Goldilocks...


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    I use my track bike on the rollers, so I have no shifting problems, but I can guarantee that I ride FAR smoother and put FAR less torque on my frame, first of all, those aluminum clad tires have only nominal resistance on the aluminum rollers! (i actually built a magnetic resistance unit for them (under 7 bucks) and it made a HUGE DIFFERENCE, in my road readiness!
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  7. #7
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    Btw, Ti is not particularly stiff, imo, more "supple" than steel
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  8. #8
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    Quote Originally Posted by Opus51569 View Post
    I知 assuming it has to be operator error, but I have a bike with a front derailleur that shifts fine in the stand... fine on the road... but when I知 riding on rollers it will not shift into the big ring. I致e tried different combinations of speed and power before and during the shift, but no luck so far.

    Anyone else experienced this?


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    I find front shifts to the big ring on my smart trainer are harder than on the road. I have attributed that to the trainer continuing to provide resistance even when I ease up for the shift. However, I am not sure that same thing applies to rollers

  9. #9
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    Quote Originally Posted by Opus51569 View Post
    Not steel for this one. Titanium.

    I had wondered if there was an odd spot where no resistance (in the stand) let it shift fine... and considerable resistance (on the road) let it shift fine... but the rollers maybe smoothed things out just enough to cause a problem???

    Sort of a 喪everse Goldilocks...


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    That kind of makes sense logically but I definitely am able to shift fine on the road even when I do so when soft pedaling (pedaling much slower than would be needed to catch up with how fast I'm going and tensioning the chain) yet there have been times when it's really slow on the trainer with more, or less, force being applied.

    I don't see frame flex having anything to do with it. Presumably you are not rocking the bike at all on both the road and rollers at least sometimes when you shift and any flex from your body weight on a straight up/down bike would be consistent between rollers and the road.

    It happens. I can't explain it. It also happens in the rear between the stand and the road (never had bad shifting only on the trainer when road when fine on stand and road were fine though)

  10. #10
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    Front derailleur shifting on rollers

    Quote Originally Posted by Jay Strongbow View Post
    That kind of makes sense logically but I definitely am able to shift fine on the road even when I do so when soft pedaling (pedaling much slower than would be needed to catch up with how fast I'm going and tensioning the chain) yet there have been times when it's really slow on the trainer with more, or less, force being applied.

    I don't see frame flex having anything to do with it. Presumably you are not rocking the bike at all on both the road and rollers at least sometimes when you shift and any flex from your body weight on a straight up/down bike would be consistent between rollers and the road.

    It happens. I can't explain it. It also happens in the rear between the stand and the road (never had bad shifting only on the trainer when road when fine on stand and road were fine though)
    Yeah, I don稚 put a lot of sprint power down on the rollers. I知 rarely out of the saddle. Just spinning mostly.

    So far, I致e had good luck with the shifting from the rear derailleur. Only the front has given me problems.


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  11. #11
    wim
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    Sometimes two things come together on rollers: Riders are reluctant to ease up on the pedals for the moment of the shift, and they don't move the shift lever as forcefully and quickly as they do on the road.

    The reasons are understandable: the wheels slow down their rate of rotation rapidly if you ease up on the pedals, and there's the concern of loss of control if you put force into the bars that could turn them.

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