Tryndamere is proably one of the best champions in this whole game. He basically turns a game around in a few minutes from 20 kills behind. This guide is to tell you how its done.

Your runes should be a normal adc page accept for your quints. You need armor pen marks, armor seals, and attack speed glyphs, the only diffrence being you want crit quints. Keep the cloth until you need a slot to sell. when you go back try to have around 2200 gold so you can get a b.f. sword and berserker's greaves right away.

Cloth armor and 5 health potions is a good start for tryndamere even though he has a heal use the health potions so you don't empty your rage bar, your critical strikes are important. Focus on the good stuff rush an infinity edge and a phantom dancer so you get crit and build the rage bar faster with the phantom dancer's attack speed. You can always substitute it out but I like to get Guardian's Angel on Tryndamere for the lols. Your ult makes you invincible and then if you die you come back so You have a ton of time to get kills even when it isn't looking good.

Start with the spinning slash only because it gives you movement and aoe. You want to level your q first and then your e so you can get health back and slow people, and as always take your ult at levels 6, 11, and 16.

Pros
[*] Easy to come back with
[*] Not extremely difficult
[*] Great farmer
[*] Team fight god
[*] Hits extremely high with crit
Cons
[*] Focused to hell
[*] Can be shut down top easily
[*] People play extremely safe because they know what your capable of
[*] Item reliant

Tryndamere is one of the best farmers in the game. It not only builds up his rage bar but when its full and your inhibitors are down you can dedicate yourself to defending and can kill super minions in 2 hits. So even if your pushed out of top your not over minion fed is better than kill fed.