6'1" 34" inseam, and I ride 175mm, 172.5mm, and 170mm on different bikes.
Can't honestly say I see a whole lot of difference particularly between the 175mm, and 172.5mm
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.