wheel diameter = mm
 head tube angle
fork rake70°70.5°71°71.5°72°72.5°73°73.5°74°74.5°75°
30mm9592898582797672696663
31mm9491888481787571686562
32mm9390878380777470676461
33mm9289868279767269666360
34mm9188858178757168656259
35mm9087838077747067646158
36mm8986827976736966636057
37mm8885817875726865625955
38mm8784807774716764615854
39mm8683797673696663605753
40mm8582787572686562595652
41mm8480777471676461585551
42mm8379767370666360575350
43mm8278757269656259565249
44mm8177747167646158555148
45mm8076737066636057545047
46mm7875726965625956534946
47mm7774716864615855514845
48mm7673706663605754504744
49mm7572696562595653494643
50mm7471686461585552484542
51mm7370676360575450474441
52mm7269666259565349464340
53mm7168646158555248454239
54mm7067636057545147444138
55mm6966625956534946434037
56mm6865615855524845423936
57mm6763605754514744413835
58mm6662595653504643403734
59mm6561585552484542393633
60mm6460575451474441383532
61mm6259565350464340373431
62mm6158555249454239363330
63mm6057545147444138353229
64mm5956535046434037343128
65mm5855524945423936333026
trail is in mm, calculated by cell by the formula:

trail = ( wheel_diameter ÷ 2 × COS(head_angle) - fork_rake ) ÷ SIN(head_angle)

bold = within Paterek's recommended range of 50-65mm

code/license is available here

questions? jeff @ greenspoons . com