They are flexier, heavier, there are fewer choices(and fewer and fewer everyday) I'm not saying you can't find them but at somepoint when you ask for one at a bike shop they're going to give you odd looks and offer the only option(maybe by pyramid?) it'll be heavy, black and awkwardly angled but you'll take it because you need one and eBay is full of scammers, while your at it look for some fixed gear that use 27 inch tires, it's the next "old school" trend we are going to watch people embrace(because they look so classic)