This is a major consideration, the bike below is a close to perfect conversion. I'd be suer happy with an outcome like that.
How tall are you? And does it need to be 650b?
I'm 5'10" so would be looking for a 54cm sq frame ideally.
Because of the frame size I'd really like it to be 650b to keep the proportions sweet.
@Hulsroy started
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This is a major consideration, the bike below is a close to perfect conversion. I'd be suer happy with an outcome like that.