If I were you I would get the 49cm or whatever size they have just smaller than 53cm. I have a 53cm steamroller, I'm 5'8", but have a 29-30" inseam (okay, I prefer khakis to be 29 in length, that's what I'm judging it by). Steamrollers have a long top tube and I did feel like I was reaching too far, I actually replaced the stock 90mm stem with a 70mm one and it feels a LOT better although I could maybe go 60mm too (never tried). So since you're 5'4" you should probably get the 49cm... it's always easier to get a longer stem than shorter stem imo..and it's better to have a slightly longer seatpost than short, stubby one..