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I have a Cannondale Women's Adventure 1 that I got this spring and have been riding on local (paved) trails every weekend. I started off riding about 6 miles a weekend and recently have progressed to 20-25 miles in a day.

About halfway through a ride, my front derailleur seems to need adjusting, I have to wiggle the shift knob to get the chain to change gears. For example, if I'm in 1 and go to 2, I have to pull the knob slightly ahead of 2 (between 2 and 3) to get it to change. To go from 2 to 1, I have to adjust the back gears a few times, or sometimes backpedalling will get it to change (but that's hard to do on a hill).

I keep taking it to my LBS (where I bought the bike) and they adjust it so it works fine in their parking lot, but again after riding for a few miles it's messed up again.

I don't know if I'm doing something wrong in technique or if there's something wrong with some piece of the bike, nor do I know enough about what's wrong to find anything that's helpful. It can be adjusted to shift correctly, but that adjustment doesn't stay for very long. What should I be looking for? Or, could I be somehow doing something when riding to cause this problem?

Some specs on my bike that might be relevant:

Shifters Shimano Revo Twist Type

Cog Set Sunrace CSM66, 11-32, 8-speed

Chain KMC 8-speed

Front Derailleur Shimano M191

Rear Derailleur Shimano Alivio

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When you're riding on level ground and you change gears, the gear change should happen easily and reliably. If that's not happening then keep pushing the LBS to make it right. –  Carey Gregory Nov 3 '13 at 6:30
Are you adjusting with the barrel adjuster? If so, is it possible that it is slipping? (Normally they should click -- if not then the mechanism may be toast.) The other possibility is that you have a cable that is failing. Or (bike shop should have checked this) the cable clamp is simply loose. –  Daniel R Hicks Nov 3 '13 at 14:00
I agree with @DanielRHicks it sounds like it's losing cable tension. –  Aaron Nov 4 '13 at 14:41
@DanielRHicks I'm not sure if you're asking about the shifters on the handlebars or some other parts. The shifters do click when I try to up/downshift, but the click isn't in the right place. The LBS will fix it to be in the right place, but about halfway through the next ride it'll be wrong again. –  Zaralynda Nov 4 '13 at 16:49
@Carey-Gregory Even on level ground it doesn't shift right. I keep taking it and explaining the problem, and they'll fix it so that the gears are right for a short while but it doesn't STAY fixed. I'm not sure if I'm asking them to fix the right part or what. –  Zaralynda Nov 4 '13 at 16:52

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