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TRIATHLON X - EXTREME 'THE WORLD'S TOUGHEST TRIATHLON' TRIATHLON 220 MAG AUGUST 2019. THE TOUGHEST JUST GOT TOUGHER. 140 miles (225 km) - ELEVATION 24,114 ft (7350 m) THE BIKE SECTION CLIMBS 12 MOUNTAIN PASSES, ALL OVER 20%, HARKNOTT, THE STEEPEST PASS IN THE UK AT 33% IS CLIMBED 4 TIMES. THE RUN ASCENDS OVER 8,800 ft, TWICE SUMMITING HELVELLYN (3100 FT)