My favourite bike repair is in Williamsburg. No businesscard no accessories no fancy schmancy. A tad quiet to begin with - but getting more and more talkative. Always very professional and efficient. They fix the bike on the street while you are waiting. Go for a coffe or hang out with the funky crowd. There are also bikes for sale.
WILLIAMSBURG 636 Lorimer Street
Open all days of the week. Usually close 7pm weekdays.