150LB 300LB 600LB 900LB 1500LB 2500LB 4500LB 3 2.5 2.5 2.8 2.9 3.1 3.6 4.9 6 2.7 2.8 3.1 3.2 3.6 4.6 7.2 9 2.9 3 3.3 3.6 4.2 5.6 9.6 12 3.1 3.3 3.6 4.1 4.8 6.6 12 15 3.3 3.5 3.8 4.5 5.3 7.7 14.3 18 3.5 3.7 4.1 5 5.9 8.7 16.7 21 3.7 4 4.3 5.4 6.4 9.7 19 24 3.9 4.2 4.6 5.9 7 10.7 21.4 27 4.1 4.4 4.9 6.4 7.5 11.7 23.7 31 4.3 4.7 5.1 6.7 8.3 13.1 26.9 35 4.6 5 5.3 6.9 9 14.5 30 40 4.9 5.3 5.6 7.2 9.9