I have had my new Cannon for about a month now, well maybe not that long yet. Anway, I have had to learn a whole different way of shifting. My old Trek MTB had grip shifters on it, just twist the handle bar and walla, your shifted. The new bike has the shimano thumb shifter, click my finger on the right to go up on the back ring and the thumb to go down. The big front ring is the opposite, you cilck with the finger to go down and push with the thumb to go up. Well, I am having a terrible time with the chain dropping when I push with my thumb to go up from 1st to 2nd. It's driving me crazy because there is nothing wrong with the bike, DH can do it just fine while peddaling the bike with his hands and shifting the gears, LBS, same thing.
But when I get on the bike and actually ride, get a good pace going and go to shift up, probably 1/3 of the time I drop the chain, have to stop and put it back on. I'll get going again, and it will change just fine a few times.
What am I doing wrong. I have tried pushing hard and quick, I've tried pushing and keeping my thumb pushed in until I see the chain in the ring. There doesn't seem to be any ryme or reason to it.
I may be exagerating some with the amount, but today we road 17 miles and I had to stop 4 times to put my chain back on and it actually happened a couple of more times but I pushed it up to the 3rd ring real quick to see if it would pop in so I wouldn't have to stop.
Is it just a learning process with the new shifters? I hope so, because that gets really frustrating.