Ultegra 6700 shifter fault

marin_maniac
Posts: 513
Just acquired a bike with Ultegra 6700, and have found that when in the lowest gear (largest sprocket on the cassette), when shifting up (to the next smallest sprocket / down the cassette), sometimes the shifter doesn't release the cable and it misses the shift.
I can get it to shift down as long as when I've shifted to the largest sprocket I've really used the lever full range of movement and probably used more force when shifting than I would normally.
I've checked the limit stops, and the indexing is fine as all the other shifts are really good.
Anyone else experienced this?
I can get it to shift down as long as when I've shifted to the largest sprocket I've really used the lever full range of movement and probably used more force when shifting than I would normally.
I've checked the limit stops, and the indexing is fine as all the other shifts are really good.
Anyone else experienced this?
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Is the bike second hand? Replacing the shifter cable would seem like the most obvious thing I think.
That you have to shift harder to get up to the largest sprocket might suggest your cable tension is a bit off?
I have 6700 and have never had this problem BTW.0 -
i have 6700 ultegra and it's perfect on mine.
However, it sounds like maybe the gear cable needs taking out and spaying wd40 down the outer cable housings.
I have heard that the indexing on the new Shimano groups with concealed gear cables can be a little more 'fragile'than the old system or campag...but mine has been fine so far0 -
Thanks for the replies fellas.
Funnily enough I replaced the cables to Jagwire racer, and even though it shifts much better, even with the old cable set it still had this fault.
Whilst on the largest sprocket, when you click to shift down the cassette, the rear mech doesn't move so I'm thinking that its a shifter issue.0 -
I have a similar problem when shifting using the bigger lever. Sometimes there is no resistance and the lever just moves but doesn't change gear (about 5% of the time). It doesn't seem to be related to a particular gear though.
I tried refitting the cable and this seemed to make things better for a while but it's gone back to how is was before.
I did read on another forum that there was a problem with a batch of these levers but not sure if that was just hearsay.
I was going to send it back but didn't want to be without the shifter as it's on my commuter bike.0 -
Scoobers wrote:I have a similar problem when shifting using the bigger lever. Sometimes there is no resistance and the lever just moves but doesn't change gear (about 5% of the time). It doesn't seem to be related to a particular gear though.
I tried refitting the cable and this seemed to make things better for a while but it's gone back to how is was before.
I did read on another forum that there was a problem with a batch of these levers but not sure if that was just hearsay.
I was going to send it back but didn't want to be without the shifter as it's on my commuter bike.
This is going to be the kiss of death now, but after changing my cables (to Jagwire racer) the fault still occured whilst in the stand, but out the road its been fine?0 -
I doubt its the shifter- the fact that it works OK for the other gears suggests it's a cable drag problem - when you cut the cables did you ensure that they were cut cleanly and the liner opened-out? Lubing the inners helps too. The other area is if the rear mech has become gunked-up - it is the spring action of the rear mech that 'pulls' the cable when released by the shifter. Also check that the tape / hoods isn't fouling the shifter internals.Make mine an Italian, with Campagnolo on the side..0
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It could be a problem in the shifter - the ratchet mechanisms rely on spring driven escapements using quite light springs, so they are a little vulnerable to contamination (although they are very well protected so this rarely occurs).
If this is the case you might be able to alleviate the problem by lubricating the shifter mechanism. Release the brake cable tension so that you can pull the lever all the way to the bars. Spray a generous amount of WD40 in there and run the shifter fully from one end of the range to the other a few times. Then lubricate with some 3-in-1 oil.- - - - - - - - - -
On Strava.{/url}0 -
When you shift to the big cog is the mech pressed hard against the limit stop. Try easing either the stop or the cable a little. Just so when you push the lever again the mech just moves a touch then goes back against the cable. Make sure it can not overshift though. If the cable is in high tension the ratchet may not release. It could also be damaged.0
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ive got ultegra 6700 on mine 1year old no problems shifting so far.going downhill slowly0
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Thanks for all the input. I'll certainly take on board about shifting the levers whilst no cable is attached!
When I installed the cables, all the ends were opened up and since then, the bike has shifted 1000% better, so hopefully for the time being I think its problem solved.0 -
I too experience this problem, and do not have a fix. However, I can tell you how to recreate the missed shifting problem, & promote possible insight/solutions from others on the forum
.....while gently pushing on the brake lever (to shift up, but not engage) attempt to shift down with the 'black' trigger shifter. You will notice this creates a 'missed shift'.....this is very common when I am wearing gloves & the finger tip catches the 'shift up lever' when I am trying to shift down.
Any solutions?0 -
I've had very similar problems with my 6700 since I got my new bike a few months ago. The right shifter was replcaced by my LBS as were the cables to Jagwires, albeit to no avail. I've changed the cables again back to Shimano and the bike set up by an ex GB mechanic and it worked much better - for a week or so but soon started to play up again. The shifting feels sticky whilst my winter bike with 5700 is perfect.
I am going to try Gore cables when dig the best bike out in spring to see if that makes a difference but after years fo using Shimano I'm not impressed with 6700.0 -
Try lengthening the rear loop to the derailleur. It is quite easy to get this too short; the symptoms will be an apparently useable shift for a little while, followed by an un-trimmable degradation (sluggish and imprecise up- and down-shift irrespective of how you tweak the barrel adjuster on the derailleur).- - - - - - - - - -
On Strava.{/url}0 -
Wow this is an old thread! My Ultegra shifts really well now thanks. I replaced all the cables with Jagwire and found that using a larger loop at the rear mech is just the ticket.0