Um... which Portland? If you're talking about the one in Oregon,my fave is Rivercity Bicycles. Great service department and they offer wonderful how-to clinics. Plus they organize some very fun rides. I miss the bike-in rides. (Like a drive-in but on a bike! ) The Bike Gallery is great too. (I've only been to the one on Sandy Blvd. and the one downtown, though.) I haven't personally used the Gallery's service department but the Sandy Blvd. location is well recommended by many.