Im working on finishing up my first build and I am struggling with getting a good shift into the large chainring.
Shifting onto the large chainring either wedges the chain between the front derailleur and the large ring then only shifts after pushing through the ‘jam’. Or the chain ends up riding up onto the teeth of the large ring for 3/4 of a rotation before it finally drops down into the grooves. (see photo for example of what I am talking about)
Here is my parts list. They are all new parts, so no wear.
Ive done the rear derailleur setup and followed guides on setting the front derailleur. IE Parallel to the chain ring, 1-3mm above the teeth of the large ring. Ive also played with lower and higher settings as well as rotating in/outboard. These adjustments lead to one of the two issues mentioned but at no point was there a clean shift.
I first had the same issues with the KMC 12speed chain so I swapped to the 11 speed but have the same issues.
Am I missing some compatibility issue? Cheap chainring issue? Or am I just not as competent as I thought?
TJhambone09 on
One thing I note about the photo, and perhaps it’s an artifact of what happened between the shift and the photo, but the chain timing is wrong in this photo. That crankset has rudimentary lift ramps on the backside of the big chainring, and rather relies almost entirely on the lift pins to snag the chain and align it with the big ring’s teeth. Yet, in your photo, the chain is not on a lift pin.
I’m going to ask some stupid questions:
1 – Are you shifting the FD while pedaling?
2 – Is the FD overshifting and snagging the chain on a tooth instead of pushing the side plate of the chain into a lift pin? The left hand inside face of the FD should only push the chain just far enough that the right hand side outer face of the chain catches ones of those steel lift pins that are stuck through the chain ring.
iljawascoding on
Is your front derailleur mounted a few millimeters too high?
Popsickl3 on
The pickup pins on the front ring are not catching on the chain. Cheapest thing to try is a chain without the outer plate sculpting that’s compatible with your rear derailleur.
ride_whenever on
Any chance you’ve clocked the chainrings wrong relative to one another, or is it one piece.
5 Comments
Im working on finishing up my first build and I am struggling with getting a good shift into the large chainring.
Shifting onto the large chainring either wedges the chain between the front derailleur and the large ring then only shifts after pushing through the ‘jam’. Or the chain ends up riding up onto the teeth of the large ring for 3/4 of a rotation before it finally drops down into the grooves. (see photo for example of what I am talking about)
Here is my parts list. They are all new parts, so no wear.
||
||
|Cassette: ZTTO 11 speed 11-34T|
|Groupset: LTWOO eR9|
|Crankset: Riro 11/12 speed 50T/34T|
|Chain: KWChian x11|
|Other chain: KMC 12 Speed |
Ive done the rear derailleur setup and followed guides on setting the front derailleur. IE Parallel to the chain ring, 1-3mm above the teeth of the large ring. Ive also played with lower and higher settings as well as rotating in/outboard. These adjustments lead to one of the two issues mentioned but at no point was there a clean shift.
I first had the same issues with the KMC 12speed chain so I swapped to the 11 speed but have the same issues.
Am I missing some compatibility issue? Cheap chainring issue? Or am I just not as competent as I thought?
One thing I note about the photo, and perhaps it’s an artifact of what happened between the shift and the photo, but the chain timing is wrong in this photo. That crankset has rudimentary lift ramps on the backside of the big chainring, and rather relies almost entirely on the lift pins to snag the chain and align it with the big ring’s teeth. Yet, in your photo, the chain is not on a lift pin.
I’m going to ask some stupid questions:
1 – Are you shifting the FD while pedaling?
2 – Is the FD overshifting and snagging the chain on a tooth instead of pushing the side plate of the chain into a lift pin? The left hand inside face of the FD should only push the chain just far enough that the right hand side outer face of the chain catches ones of those steel lift pins that are stuck through the chain ring.
Is your front derailleur mounted a few millimeters too high?
The pickup pins on the front ring are not catching on the chain. Cheapest thing to try is a chain without the outer plate sculpting that’s compatible with your rear derailleur.
Any chance you’ve clocked the chainrings wrong relative to one another, or is it one piece.