I'm buying my first road bike soon, and since I'm unfamiliar with them I should probably get a sizing. Is this a universal sizing (ie. I write stuff down and can take it with me when shopping other places), or does it mean it would be best to buy my bike from that particular shop because the guy already knows my size?
My main concern is I don't know if I would be able to tell if a frame size were too big or small. I'm 5'4" with a ~28.5" inseam, so I'm probably a 49cm or 50cm.