Not shifting to the big chainring
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UFTriGator posted 1 year ago.
Your upper limiting screw on your front derailleur is probably too tight. There should be two small set screws on the derailleur. Sometimes they're marked with an H and an L. If they are, turn the H one to the left 1/4 turn at a time until the chain shifts properly. Don't overdo it, because that will cause your chain to fall off the outside of the chainring completely.
If they're not marked, you'll just have to guess. If the derailleur is in the big ring position and the screw you turn moves the derailleur, that's the H screw. If not, it's the L screw.
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Not fast enough.
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JamieM posted 1 year ago.
It could be the limit screws, but it could also be the cables. Since it's not shifting into the big ring, your cable probably needs to be tightened a bit.
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Stupid_O posted 1 year ago.
Thanks for the tips UFTrigator and JamieM. I'll try it when I get back home today.
tri-ac: Yeah, it does shift onto the big ring OFF the trainer no problem.
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kylie posted 1 year ago.
if it is shifting off the trainer I'd be careful playing with the limit screws or other settings... perhaps instead your bike is rubbing on the trainer somehow? I'd start with a look at how it is set up there, and make sure no cables are pinched or anything.
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PJT posted 1 year ago.
Cable tension and limit screws are definite possibilities. I don't know what trainer setup would "pinch" a FD cable, but I guess that could happen too. If none of those things turn out to be the culprit, here's one other guess:
Front derailleurs don't shift very well under load (i.e., when you're putting a lot of power to the pedals), especially going from little to big ring. Since you cannot really coast on a trainer, you might be pushing the pedals too hard to get the FD to shift correctly. Try easing up on your pedaling power for a second or two when you attempt to shift, that might just do the trick.
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getdusty posted 1 year ago.
I have the same problem with my bikes if I over tighten the rear roller on my trainer. If it's not tight enough the rear wheel slips though... You may have a very small alignment issue so don't try to adjust the FD too much in order to make it 100% perfect on the trainer or you may have troubles on the road...
hi guys. just got myself a trainer, the minoura E-RDA-1050R-PM
(the only type available...not many trainers in this part of the world). have done 3 rides on it so far. i'm loving the ability to do intervals without traffic interruptions, but i'm having trouble shifting into the big chainring. anyone have any idea why this is happening and know a way to overcome this?
cheers.