I'm interested in purchasing the Cannondale Quick 4 as a gift for someone, the only trouble is I can't tell which size (between S,M,L, and XL) is most appropriate for them. The website has a size chart that corresponds to each size, but it's I'm still having troubles determining which size is suitable. The guy I intend on getting it for is 6'1 and a half. Here's a link to the bike.
Any comments and tips would be really helpful.