Ultegra R8000 front derailleur chain rub
Hello,
Just wondering if anyone can help. I recently acquired a new bike and in the smallest three sprockets the chain rubs against the front derailleur. Not a huge issue but it annoys me. I've adjusted the tension to the point where there is a very small gap between the crank arm and the derailleur but it still rubs. If I adjust it any more the crank arm would rub against the derailleur. Is there anything that can be done? Or will I just have to live with it?
Just wondering if anyone can help. I recently acquired a new bike and in the smallest three sprockets the chain rubs against the front derailleur. Not a huge issue but it annoys me. I've adjusted the tension to the point where there is a very small gap between the crank arm and the derailleur but it still rubs. If I adjust it any more the crank arm would rub against the derailleur. Is there anything that can be done? Or will I just have to live with it?
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The front mech has 4 positions:
Big ring trim and untrim
Small ring trim and untrim
I have the same mech and with the trim you can get the full range on the rear cassette without chain rub.0 -
The 8000 has a specific way to be set up using the markers on the FD if they are aligned and set up properly it's shouldn't rub .
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Is it aligned correctly? Outer frame should be aligned with the outer face of the chain ring.0
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Unfortunately trimming the big ring only gets rid of chain rub when using the lower gears. When untrimmed its still rubbing using the higher gears.singleton said:The front mech has 4 positions:
Big ring trim and untrim
Small ring trim and untrim
I have the same mech and with the trim you can get the full range on the rear cassette without chain rub.0 -
Okay - your initial post didn't say which ring you were in when getting the rubbing.sbbefc said:
Unfortunately trimming the big ring only gets rid of chain rub when using the lower gears. When untrimmed its still rubbing using the higher gears.singleton said:The front mech has 4 positions:
Big ring trim and untrim
Small ring trim and untrim
I have the same mech and with the trim you can get the full range on the rear cassette without chain rub.
Sounds like the mech needs to be adjusted to be further out, then trimming will bring it back in a bit for the lower gears.1 -
https://youtu.be/8SO54cdwtxc
https://youtu.be/9zZWAUp6oOE
Found these useful when I messed up my front mech. Might not all apply but will help you check your derailleur is set up correctly. R700 is the same set up as R800Pinno, מלך אידיוט וחרא מכונאי1 -
Thanks for your responses. The trouble is, the mech is as far out as I can get it. There's only a small slither of a gap between its outer edge and the crank arm. The mech itself is attached to a bracket on the frame so all I can do to adjust it is move it up and down. I've moved it down a touch so there's a gap of 1/2mm. Will give it a try later.singleton said:
Okay - your initial post didn't say which ring you were in when getting the rubbing.sbbefc said:
Unfortunately trimming the big ring only gets rid of chain rub when using the lower gears. When untrimmed its still rubbing using the higher gears.singleton said:The front mech has 4 positions:
Big ring trim and untrim
Small ring trim and untrim
I have the same mech and with the trim you can get the full range on the rear cassette without chain rub.
Sounds like the mech needs to be adjusted to be further out, then trimming will bring it back in a bit for the lower gears.0 -
Tightening the mech cable will move the cage out further on the big ring.sbbefc said:
Thanks for your responses. The trouble is, the mech is as far out as I can get it. There's only a small slither of a gap between its outer edge and the crank arm. The mech itself is attached to a bracket on the frame so all I can do to adjust it is move it up and down. I've moved it down a touch so there's a gap of 1/2mm. Will give it a try later.singleton said:
Okay - your initial post didn't say which ring you were in when getting the rubbing.sbbefc said:
Unfortunately trimming the big ring only gets rid of chain rub when using the lower gears. When untrimmed its still rubbing using the higher gears.singleton said:The front mech has 4 positions:
Big ring trim and untrim
Small ring trim and untrim
I have the same mech and with the trim you can get the full range on the rear cassette without chain rub.
Sounds like the mech needs to be adjusted to be further out, then trimming will bring it back in a bit for the lower gears.
But the cage shouldn’t be close to the crank arm. Post some pics if you get the chance.Pinno, מלך אידיוט וחרא מכונאי0 -
C h e c k a l i g n m e n t
At least rule that out, because its the only adjustment you have left. Sometimes chain rub is caused by the rear of the cage being angled slightly to the non drive side.
It's the only mech adjustment you have left, assuming you've done the obvious thing and checked that it is indeed at the end stop when it is rubbing.0 -
you've set up the cable into the mech correctly, yah? cable run and grub screw?.
The camera down the willy isn't anything like as bad as it sounds.
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I don't think you have it set up properly ,the video above will get you where you need to besbbefc said:
Thanks for your responses. The trouble is, the mech is as far out as I can get it. There's only a small slither of a gap between its outer edge and the crank arm. The mech itself is attached to a bracket on the frame so all I can do to adjust it is move it up and down. I've moved it down a touch so there's a gap of 1/2mm. Will give it a try later.singleton said:
Okay - your initial post didn't say which ring you were in when getting the rubbing.sbbefc said:
Unfortunately trimming the big ring only gets rid of chain rub when using the lower gears. When untrimmed its still rubbing using the higher gears.singleton said:The front mech has 4 positions:
Big ring trim and untrim
Small ring trim and untrim
I have the same mech and with the trim you can get the full range on the rear cassette without chain rub.
Sounds like the mech needs to be adjusted to be further out, then trimming will bring it back in a bit for the lower gears.
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correct cable routing in piccies - remrmber to use grub screw correctly
.The camera down the willy isn't anything like as bad as it sounds.
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Download the Shimano installation instructions from the Shimano website. Take the cable off the derailleur. Set the derailleur up from scratch following the instructions to the letter. Now when using the appropriate trim positions you won't get any rub.1
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Thanks for the responses. I'm going to have to start again. The bike is brand new so I thought it would have been set up ready to go without this faff.
The chain also rubs (quite a bit more) on the inside of the derailleur when in the smallest chain ring and in my lowest gear too. I've slacked it all off and screwed the lower limit screw and to the point it doesn't go any further. I have no choice but undo the cable and start again.0 -
I am tempted to say " I have the same problem" except it is not a problem because I never use little sprockets with my small chainring. There is no need to, you have very similar gear ratios in big chainring and 2/3 bigger sprockets ( i.e. cogs on your cassette). Using bigger chainrings and sprockets is more efficient. Probably not enough for me to notice but Ganna used 65 +14 on his 1 hour record ride. He could have used 51+11 for the same ratio but he did not for a reason.
OP, just stop watching videos , ride your bike and smell the flowers.1 -
if its brand new just take it back to the shop and get them to sort it..
The camera down the willy isn't anything like as bad as it sounds.
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It's my lowest gear. The biggest sprocket with the smallest chainring.lesfirth said:I am tempted to say " I have the same problem" except it is not a problem because I never use little sprockets with my small chainring. There is no need to, you have very similar gear ratios in big chainring and 2/3 bigger sprockets ( i.e. cogs on your cassette). Using bigger chainrings and sprockets is more efficient. Probably not enough for me to notice but Ganna used 65 +14 on his 1 hour record ride. He could have used 51+11 for the same ratio but he did not for a reason.
OP, just stop watching videos , ride your bike and smell the flowers.0 -
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seems that no matter where it was bought it wasn't part of their pdi tbh fam innitandyrr said:
…hope it wasn’t bought at Halfords as it might not be part of their PDI …MattFalle said:if its brand new just take it back to the shop and get them to sort it.
.The camera down the willy isn't anything like as bad as it sounds.
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Photos will help to sort your issues. Pics of chainring and derailleur side on and end on with chain on big ring and small sprocket.
Sometimes. Maybe. Possibly.
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This is what I would do or if distance is an issue talk to them about getting itvto the nearest dealer at their expense.MattFalle said:if its brand new just take it back to the shop and get them to sort it.
Only issue might be if they actually built it ,which would be quite rare .
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but but but but shouldn't they have checked it as part of their pdi before letting it out of the shop??????.
The camera down the willy isn't anything like as bad as it sounds.
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I recently had a Liv in 3 weeks old .MattFalle said:
Major retailer
62 year old asked for it to be geared for hills
She got 52/36 ,11/30
A power meter she didn't ask for and on inspection after 2 visits to fix the gears not working properly the customer came to me it was clear on inspection whoever set it up didn't have a clue how to do the 8000 series FD .
Of all the shimano stuff the 7000/8000 seems to be where most set up issues happen
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We've no way of telling what happened to the bike after it left the shop. He might have inadvertently knocked the front derailleur loading/unloading from car for instance. What the shop did is by the by. What the OP needs is clear advice on how to fix it himself. We need photos of what is happening to advise him correctly.MattFalle said:but but but but shouldn't they have checked it as part of their pdi before letting it out of the shop??????
Sometimes. Maybe. Possibly.
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As he seems able to change gear okay, this has all the hallmarks of very minor adjustment needed. There are very few things left to check. If the OP can't figure it out, he needs to take it to a bike shop. There's not much else to say.0
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Tbh, he's best taking it to a shop before he chews up the cable beyond hope or jeffs up the mech and/or shifter..
The camera down the willy isn't anything like as bad as it sounds.
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so what you saying?trevor.hall12 said:
I recently had a Liv in 3 weeks old .MattFalle said:
Major retailer
62 year old asked for it to be geared for hills
She got 52/36 ,11/30
A power meter she didn't ask for and on inspection after 2 visits to fix the gears not working properly the customer came to me it was clear on inspection whoever set it up didn't have a clue how to do the 8000 series FD .
Of all the shimano stuff the 7000/8000 seems to be where most set up issues happen.The camera down the willy isn't anything like as bad as it sounds.
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The 7/8000 onwards setup with toggle link are often setup wrong as mentioned above - I suspect because the setup procedure is not like most other FDs. Its important to follow the Shimano setup guide.
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