You should be able to ride multiple sized bikes easily with minor adjustments. I'm 5'8" and currently ride a 52. It's on the smallish side. My previous bikes were a 54 and a 56. All were just fine. Don't think you HAVE to have a 54 or a 56 just because some calculator said so. Bikes are adjustable to fit many body types. Get it close enough then make adjustments. The worst thing you can do is fall in love with a particular bike, then pass on it just because it isn't the exact perfect size you think you need. Especially in this market right now, buyer's really can't be overly picky because inventory just isn't there. If you think a 54 is just right, but the bike shop only has a sweet 52 or 56...get it.