Looking for advice on converting our 10 speed Cannondale road tandem to 9 speed for touring purposes. After 12 months and 10000 kms we are finding the 10 speed unreliable. The gears always seem to need adjusting, the chain never quite sits perfectly on the gear on the first change, etc, etc.
The research we have already done shows that the 10 speed chain is much more narrow than the 9 speed and that we could likely expect better performance from a 9 speed. We are currently running Shimano Ultegra. If we change the rear cluster to a 9 speed, change the chain to 9 speed, will we then also need to change the shifter to a 9 speed? Is there another option? Any advice appreciated.