Bought my bike from halfords the other day. I took it back in today as the front gears weren't working properly as the derailur if that's how you spell it wasn't set properly. The gears all seem to work fine now but when I ride i can feel a slight 'grind' through my feet (basically It's just not as smooth as when I got it). It doesn't look as though It's the derailur rubbing again. It seems to feel worse when the front gear is on number 2 out of the 3 cogs. Is this normal as it is minimal or is there a problem somewhere?