BFCB20138 - 1/2 X 11/128", direct mount, 3 mm offset, 50.5 mm chainline, 1x11-speed, 1x10-speed, 1x9-speed, singlespeed, CrMo

BFCB0144 - 1 x 1/8/9/10/11/12 käiku, 44T, Direct Mount, 3 mm offset, chainline 47.5/50 mm

BCRB4RL15038S3 - 1 x 1/8/9/10/11/12 käiku, 1/2" X 11/128", 38T, Direct Mount, 7.0 mm offset, chainline 50.0 mm, spacerless

00.6218.007.000 - 14T

00.6218.013.004 - 38T, Bosch Gen 4, Non-boost