"Here are the forks that White Brothers can currently offer in the 650B
format along with some critical dimensions for frame design:
All forks will have a measurement of 363mm (+/-2mm) from axle to underside
of brace. And all QR forks will have a 44mm offset and all 20mm forks will
have a 42mm offset.
650B Magic 80 A/C 464mm - QR or 20mm
650B Magic 100 A/C 484mm - QR or 20mm
650B Fluid 100 A/C 484mm - QR or 20mm
650B Fluid 130 A/C 517mm - 20mm axle only"