I was just in Mission Bay for the first time two weeks ago and really found the staff and store to be really great.

Stay away from Village Cycle at all costs. Wait, Koffee said that too so it must be true. They don't let you test ride bikes, which is a joke for a bike shop. Also, while salespeople are not on commision there; you will be swooped down upon by one of the employees the other employees there call "Dracula." He will then proceede to pressure you into any bike you look at, and convince you it fits.

I also like Cycle Smithy at 2648 N. Clark Street and LOOOOOOVE Upgrade Cycle Works at 1062 N Milwaukee Ave.