Unable to change from 14th to 7th I've got a bike that I have had for about 8 weeks and it has already been back to be serviced twice. It's just returned from the second service and I've noticed that it is not shifting from 14th to 7th gear - 2nd at the front and low gear at the back to low at the front and low at the back.

If I change down to 12th or 10th it will comfortably change down to the low gear at the front. Is this a common problem or should I get it looked at again?
If you can, with the chain in one of the middle cogs in the back, shift to each of the front chain rings then your front derailleur is likely in proper alignment and adjustment. This question and answer cover how to adjust the derailleur if you want to learn how to do it yourself.

What you are describing, shifting to small ring in front and small cog in back, or big ring in front-big cog is called "cross chaining" and should be avoided. If you ride cross-chained it causes:


Significant stress on the chain, and may cause failure.
Added friction and wear on the drive train.
Possible derailleur failure if you cross chain "big to big"