I think if your 5' 10" the bike would fit you perfectly. I'm almost 6'1". I rode a Med. Norco A-line very comfortably for years. I think that I could ride the s/m bike alright as well, but the opportunity came up for me to get a M/L so I went ahead and got that one. The difference in size isn't much. I wanted to upgrade to a direct mount stem as well that played into my decision to get the M/L. You can check out the exact measurements on norco's website under the archive bike section, but I honestly think it would fit you just fine. The bike itself is in awesome condition!! Its a great deal. Let me know if u have any other questions or feel free to give me a call. 702-460-4484