What do you call people from Amsterdam? 

Amsters? (Heh, like British hamsters. No.) 

Dammers? 

Dams? 

Amsterdammers? 

Okay whatever. 

Where is the best place to rent a bike in central Amsterdam? 

I see Mac bike rentals everywhere. But they look like pretty plain bikes. I have a Giant back home. Probably don't need so many gears here. I've also seen Yellow Bikes around town.  

Any advice?