Triple issue

[Jables156]

Hi, I have a triple set of Ultegra, for some reason now I can no longer engage the largest chain ring, is this an adjustment to the front mech ? I have tried on the turbo trainer and all I can see that happens is the chain rubs on the largest ring but won't engage, any tips or help appreciated.

Cheers
Jim

 

[buggi]

if you have some twisty cable adjusters at the handlebar ends, you could twist those to see if it makes a difference. i don't have adjusters so when this happened to mine the other day (mine is a double) i put the chain in the smaller ring, undone the nut where the cable attaches at the derailleur, pulled the cable through tighter, and then tightened the nut back up. then it lifted onto the big ring when i tried it. took a bit of pulling but worked in the end (i hadn't done it before)

 

[ColinJ]

3 possibilities I can think of ...

1. The front mech endstop needs adjusting to allow the chain to be pushed a little further over.
2. The front mech is worn (I had a shifting to big ring problem - a new front mech sorted it).
3. Any ramps/pins on the big ring are worn so they aren't helping to pick the chain up.

 

[PatrickPending]

cable tension most likely as Buggi suggests, happened on my commuter, turned out that the cable was starting to break (a few strands had broken around the bottom bracket) new cable fitted works fine now.

Theres many a video on facetube


http://www.youtube.c...h?v=ngm6dr-1na0

let us know how you get on.

 

[gwhite]

cable tension most likely as Buggi suggests, happened on my commuter, turned out that the cable was starting to break (a few strands had broken around the bottom bracket) new cable fitted works fine now.

Theres many a video on facetube


http://www.youtube.c...h?v=ngm6dr-1na0

let us know how you get on.

If this was working and stopped, then the likeliest cause would be that the FD is gummed-up with winter gunk and corrosion. Lube all pivots on the FD and with the chain on the smallest ring, pull down the cable to its fullest extent. As you work this the FD should free-up in time.

 

[zacklaws]

As other have said, the cable being slightly slack unless you have been tinkering with the "H" screw on the mech and restricted its outward movement. For a test if possible, try pulling on the cable by hand to see if you can change up to the large chain ring. If you can, then the problem is slack cable and if you have an adjuster, then turning it clockwise should tighten the cable up. If you cannot take up the slack by the adjuster then it becomes a bit more complicated as you will have to loosen the cable and pull it tight and then refasten it. If you cannot pull the cable enough by hand to move the mech to change to the large chain ring, then it looks like the "H" screw needs adjusting to allow the mech to move outwards to allow the chain to shift onto the large chain ring.

If you do not have any bare cable to pull on by hand, try moving the mech outwards by hand towards the large chain ring to check its movement is not restricted.

 

[Jables156]

Thanks for all the tips will have a play tomorrow and see what happens

 

[Jables156]

right watched the video on youtube and found that the issue was actually with the top chain ring limit, adjusted that (and then also checked the lower limit to make sure all was ok) and now I can get onto it no bother, the only thing is that the derailleur is lightly touching the chain or if not a fraction of a mm away.
Is this now a case of tensioning the cable to get the 2mm gap or is this normal ?? as the derailleur can be pulled toward the chain ring by hand and will move between 0.5-1cm ?

Cheers
Jim

 

[2Loose]

I am glad you sorted it, but I am a bit confused as to how the Upper limit screw changed - it was fine before...cables stretch, bearings wear, but screws don't move on their own...or do they?

 

[zacklaws]

right watched the video on youtube and found that the issue was actually with the top chain ring limit, adjusted that (and then also checked the lower limit to make sure all was ok) and now I can get onto it no bother, the only thing is that the derailleur is lightly touching the chain or if not a fraction of a mm away.
Is this now a case of tensioning the cable to get the 2mm gap or is this normal ?? as the derailleur can be pulled toward the chain ring by hand and will move between 0.5-1cm ?

Cheers
Jim

Once again use the High screw adjuster to get the clearance, aprox 1mm, but the chain needs to be on the large chain ring and also the smallest rear sprocket. Once done turn the pedals and ensure you have clearance all the way round a full turn of the pedals, just in case your chain ring is a bit cockeyed, if it does catch the chain, then readjust the adjuster to get the clearance.

>>>>>as the derailleur can be pulled toward the chain ring by hand and will move between 0.5-1cm ?<<<<<

I do not understand this part, is the distance the deraileur moves from the small chain ring to the largest or the distance beyond the large chain ring?

 

[Jables156]

I think the problem is that the shop didn't set it up right to start as they converted a 2 speed to a triple after ordering me one and then saying they couldn't supply it but would make it up for me(long story)

Set bottom and top limits fine and worked through all gears, but on the top limit on the large chain ring there is no clearance between it and the chain (not really rubbing but can't see fresh air between them) and can't get it with the limit screw, so I can physically pull the derailleur towards me about 0.5 to 1 cm so does this indicate that the cable needs more tension aswell

hard to put into words but hope that makes it a bit clearer....