I'm 5'10 - can't decide on medium or large for this. My inseam is 31.5", the standover on the ripcurrent (bike I'm looking at) for large is 30.3" - seems fairly close to my crotch there. the medium is 29.5". I just don't want to regret making the wrong choice. I'm leaning towards medium. If anyone who struggled on the same decision could help out, would be greatly appreciated!