sch5 s sch 10s sch 20s sch 40s sch 80s sch 20s sch 30s sch 40s sch 60s sch 80s sch 100s sch 120s sch 140s sch 160s xxs 10 17 1.2 1.6 2.0 2.5 3.2 2.5 3.5 15 22 1.6 2.0 2.5 3.0 4.0 3.0 4.0 5.0 7.5 20 27 1.6 2.0 2.5 3.0 4.0 3.0 4.0 5.5 8.0 25 34 1.6 2.8 3.0 3.5 4.5 3.5 4.5 6.5 9.0 （32） 42 1.6 2.8 3.0 3.5 5.0 3.5 5.0 7.0 10.0 40 48 1.6 2.8 3.0 4.0 5.0 4.0 5.0 7.0 10.0 50 60 1.6 2.8 3.5 4.0 5.5 3.5 4.0