I have never used a mobile bike tune up service before, but I am so glad that I did! Dirt Dart made it SO easy to check "bike tune-up" off of my To-Do list! This guy knows his business! He has been repairing bikes for over 20 years. I don't have a fancy bike, but it was acting a little "crusty", and the tune-up that he did on it made it run like butter!!! Will definitely do it again next year!