We purchased a Burley Tandem about 5 years ago. I've never been comfortable with grip shifters so we changed to thumb shifters. It seemed to work ok for a while but this season we've been having a lot of trouble shiffting and with the chain falling off.
We're being told that thumb shifters aren't compatible with the bike. The shop changed the front derailer and chain, and it's working somewhat better. However, we can't drop to the small ring in the front when going flat or uphill. It will only drop when going downhill which isn't very useful.
I can only hope I not the only one out there that doesn't like grip shifters and there is a solution out there. Thanks.