The Tryndamere build for Top is Galeforce and Lethal Tempo. This LoL Tryndamere guide for Top at Platinum+ on 13.24 includes runes, items, skill order, and counters.
Tryndamere Counters
52.4%
(+1.1%)
58.2%
(+2.6%)
4.6%
(+1.2%)
6.8%
(+0.9%)
718
(+2)