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Ultegra LH brifter issue

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Ultegra LH brifter issue

Old 01-13-22, 09:44 PM
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Sjtaylor
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Ultegra LH brifter issue

My lefthand brifter shifts up nicely progressively in four steps. The brifter shifts down nicely for one step, shifts down one more step but the click sounds funny. The next shift the derailleur slams all the way back down. I've done the WD40 thing a lot and shifted the brifter a lot to try to free up and clean out any goop that might be cloging the mechanism. Now I'm thinking something is broken inside and there is nothing else I can do but replace the brifter. BTW the brifter is shifting a triple.

Any suggestions? Thanks.
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Old 01-13-22, 10:19 PM
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I would first reconfirm the number and function of both the primary shift "points" and the trim ones between the primary steps. I find the best way to do this is not with the cable attached to the der but loose and only tensioned slightly with your hand. Better to feel the softer trim steps/points. Shimano had various versions of their Ultegra grade over the years with differing trim functions. Some do have a very hard and abrupt down shift movement, going from the middle to the granny. I always thought this was purposeful and an attempt to have more positive shifting onto the granny ring (as many riders don't seem to be able to either shift before they bog down or don't know how to soft pedal through a shift). Andy
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Old 01-14-22, 08:30 AM
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Also, just to rule it out, check that the cable isn't fraying at the shifter mechanism and that there are no broken off strands stuck in the shifter.
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Old 01-14-22, 11:06 AM
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Just to be clear, shift up means going to the larger ring by pushing the brake lever to the side?

If so, then I might check that your cables aren't cutting into your BB if this is bare externally routed cable. I actually had that on one of my bikes that came from the days of not using a cable guide under the BB. One cable had cut almost completely through the shell. If you have a cable guide under the BB, then make certain it isn't being cut into. Though for me, I think it was the rear shifter cable that had cut most of the way through.

Otherwise, undoing the pinch bolt so you can pull a few inches of cable out of the shifter to inspect it for frayed strands will be another good thing to check. Though that usually shows first as a problem shifting to the smaller ring or smaller cogs (physically smaller, fewer teeth).
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Old 01-14-22, 01:28 PM
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Is this nine speed? If so, the Ultegra triples were known for this sort of thing. Sounds worse on the stand than on the road, but still, a slammer down into the granny.
Might have been a difference between 6500 and the improved 6510, but don’t remember offhand which one I had as it was over ten years ago.
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Old 01-14-22, 01:34 PM
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Originally Posted by Andrew R Stewart View Post
I would first reconfirm the number and function of both the primary shift "points" and the trim ones between the primary steps. I find the best way to do this is not with the cable attached to the der but loose and only tensioned slightly with your hand. Better to feel the softer trim steps/points. Shimano had various versions of their Ultegra grade over the years with differing trim functions. Some do have a very hard and abrupt down shift movement, going from the middle to the granny. I always thought this was purposeful and an attempt to have more positive shifting onto the granny ring (as many riders don't seem to be able to either shift before they bog down or don't know how to soft pedal through a shift). Andy
So maybe my brifter isn't broken. that abrupt down shift kinda describes whats happening and what you say makes sense. My daily rider is a Centurion Semi Pro with barcons that I've built as an all-road bike. I indented irt's chainstays for 38mm tires. The brifters are on a Serotta that I want to start riding again this year. Thanks.
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Old 01-14-22, 01:37 PM
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Originally Posted by rccardr View Post
Is this nine speed? If so, the Ultegra triples were known for this sort of thing. Sounds worse on the stand than on the road, but still, a slammer down into the granny.
Might have been a difference between 6500 and the improved 6510, but donít remember offhand which one I had as it was over ten years ago.
Thanks. I just responded to a similar reply. Slammer down to granny describes it exactly.
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