Hello
I have a problem with my front mech when downshifting from the 50 to the 34 tooth ring. It de-rails from the chainset about 25% of the time.
Basically the chain goes too far inwards and misses the 34 ring de-railing it completely.
Bike setup:
Chainset: Extralite Extralite E-Bones WRC 50/34
Chainline is 44mm on a BSA68 bottom bracket shell
Front mech: Shimano Dura Ace FD-7700-F
Shifter: Dura Ace ST-7700 for double chainset - 9 speed
Chain: SRAM PC-89R Hollow Pin
Does anyone know how I can fix this?
Images:
I have a problem with my front mech when downshifting from the 50 to the 34 tooth ring. It de-rails from the chainset about 25% of the time.
Basically the chain goes too far inwards and misses the 34 ring de-railing it completely.
Bike setup:
Chainset: Extralite Extralite E-Bones WRC 50/34
Chainline is 44mm on a BSA68 bottom bracket shell
Front mech: Shimano Dura Ace FD-7700-F
Shifter: Dura Ace ST-7700 for double chainset - 9 speed
Chain: SRAM PC-89R Hollow Pin
Does anyone know how I can fix this?
Images: