I bought the Trek 6000 with and 18.5" frame. I'm 5'7"
I'm a beginner in MTBing and not aware of the proper frame sizing.
After riding it 2 times around town, I'm not feeling any discomfort whatsoever but people are saying you need at least 2-3 inches clearance between the frame and the balls. Mine just touches the frame but is not sitting on it.
I plan to hit the trails real soon and not into jumping or extreme biking. Is there really a very good chance of cracking my nuts into the frame when MTBing?
And lastly, is there a chance that the LBS will accept if I return the bike in exchange for a smaller frame?
Any advice would be greatly appreciated.