I'm 5'11. I was looking at two identical diamondback hardtail mt bikes a while back. One was 18, the other was 16.5. I felt like the 16.5 was more fit for me, however I wasn't sure if I'd like the size of it on certain trails, so I went with the 18. Best move I ever made.
In short - If it were ME... and I were in between 2 sizes... I'd go 1 up rather than 1 down. Mostly because you can adapt to a frame slightly bigger, whereas you're kind of cramped and stuck with a frame that's slightly smaller.
In short - If it were ME... and I were in between 2 sizes... I'd go 1 up rather than 1 down. Mostly because you can adapt to a frame slightly bigger, whereas you're kind of cramped and stuck with a frame that's slightly smaller.