@kingofbiscuits
When I test rode the medium, I had to push the seat right back on the rails midway into the ride. The LBS also had a look at me riding it and also suggested that it may be a bit small.
But they said I could fix that with a longer stem. But I didn’t want to do that as I prefer a shorter 80 to 70mm stem set up. Plus I didn’t want to buy a new stem.
I’ve now just picked up my large Yeti and the sizing seems spot on.
There are 3 things that helped me choose the size:
1 – LBS watching me ride and advising on sizing.
2 – The test ride
3 – The fact Yeti recommend a large for my height. I would hope that with all the effort gone into making such a decent frame, they would be accurate with sizing guides.
But thats just my view point and experience.