so due to a crash you can read about here, i'm in the market for a new bike. the bike will serve primarily as a foul weather/winter/back-up commuter ride. i think i've settled on the Scott Sub 10 Men. i couldn't find any stores in chicago that have it in stock, so i went to REI anyway to check out similar bikes in Scott's Sub line. from what i was told, all frames in the Sub line have very similar geometries (that has to be taken with a grain of salt, i know).
so the clerk at REI told me that i would need a "medium" size based on my height. i hopped on one and it felt big to me. it certainly felt a lot bigger than my old bike that was wrecked. i then got on a "small" size in the same line and it felt much more like what i was used too, just that i'd likely need a longer seat post and stem on the bike. even though i'm 5'-8" and the sizing chart says i'm definitely in the "medium" range, the smaller bike felt better to me, or it least i imagined it would with some longer components.
i then went home and measured the frame of my old bike against the geometry chart dimensions of the small and medium sizes of the Sub 10 frame, and my old bike's dimensions came a lot closer to the small size than they did to the medium, and i LOVED the way i fit onto my old bike, even if it was on the small side.
my dilemma: because there are no bikes of either size in stock at any chicago REI's (or any other local Scott dealers that i could find), i have to order the bike online and have it shipped to my REI store. what size to order? do i go with what the sizing chart dictates, or should i follow what i really know about myself and how i like to fit onto a bicycle? i think i may have already answered my own question, but i'm just looking for some back up here and maybe a reassurance from another rider or two that i'm not crazy for liking a slightly undersized frame. it seems like it's easier to make a small frame ride a little bit bigger than it is to make a big frame ride a little bit smaller.
am i alone in this?