Half Distance 70.3 Triathlon Bolton – A Premier UK Triathlon Experience Compete in the Half Distance 70.3 Triathlon Bolton, featuring a 1.2-mile (1.9 km) swim at Pennington Flash Country Park, with water temperatures averaging 66°F (19°C). The 56-mile (90 km) bike course takes athletes through the villages of Lowton, Abram, and Bickershaw, with two loops in Horwich and Bolton. The course includes a climb on Victoria and Old Kiln Roads, with 840m of ascent and flat sections for high-speed ...