This is the first time I have made a build guide but I just wanted to stop and say this, tryndamere is not that commonly used when it comes to champions and my question is why?
I admit that you have to play skilfully to start of but when you eventually get a good build going (like the one I have shown) he could be argued to be the most overpowered champion in the game. You 4 shot enemies that don't build health, you can easily destroy the people that do with a bit more effort and then for buggers like warwick, you can just get the kill on him with your ultimate :). I hope you look at this and agree with me, but if not, everyone has their own opinion. I personally love this build and I was quite surprised that no-one had already posted it because from my experience it can get very good.