I have a giant mountain bike brand new I bought it a week or so ago. At first the brakes where new and needed to be used. I use this bike to get to work and back about 8 miles. The front disc seems to be rubbing some where cuz I get some vibrations while I ride. I have taken it to the shop to get the wheel put on right but they said it was fine and not rubbing could this be something else??? Enjoy your ride