from ashcrofts
LT 230 Ratios
12D = 1.667
13D = 1.410
14D = 1.003
15D = 1.192
20D = 1.667
22D = 1.410
25D = 1.410
26D = 1.003
27D = 1.192
28D = 1.222
29D = 1.192
32D = 1.222
36D = 1.211
38D = 1.211
40D = 1.211
41D= 1.211
43D = 1.410
47D = 1.667
57D = 1.410
59D = 1.211
61D...