Scales: 2:1, 3:1, 4:1, 5:1, 7:1 and 10:1.
27213 = 400 cc
27214 = 650 cc
27215 = 1300 cc
27216 = 2230 cc
Scales: 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1 and 12:1.
27213S = 400 cc
27214S = 650 cc
27215S = 1300 cc
27216S = 2230 cc