Size M or L
According to the sizing chart you choose M for shortsize S to M and 60 to 70 kg, L for 70 to 80 kg. I weigh 70 kg, M for shortsize and upper legcircumference 52 cm. I measure 1.87 m... Should I take M or L?
Definitely no bigger than M. I'm 187cm and 80kg, I got Medium Black and they are a PERFECT fit. With your weight (you must climb like a machine!), I'd almost be tempted by small...but for the length, I'd go M.