just bought a new Rocky Mountain Element70. Was planning on hitting the trail tomorow. I was reading the manual and it says don't even try to ride a bike if there is not enough clearance when standing over the frame. I think they may have fit me poorly at the bike shop as it had to be special ordered, and i don't want to own a wrong size bike. the bike is a size 18. I'm a male...between 5'9" and 5'10" and only seem to have an inch, maybe 2 clearance standing over the top tube. we had tried a 16.5 and it seemed small and there is no in between size. I'm an XC guy who bikes about 3X a week. The bike feels fine riding on the street but my concern is putting trail wear on a bike i shouldn't be riding. Any advise is appreciated.