Ritchey WCS 1 Bolt Saddle Clamp Kits Octalink Size Guide available here

Size Guide available here

There seems to be a scientific basis for this

Rear Right

Saddle Clamp (steel saddle rails) (QTY: 1)

MOTOREX WHITE GREASE has outstanding wear-reducing properties and remains malleable at cold temperatures

Ritchey WCS 1 Bolt Saddle Clamp Kits Octalink Size Guide available hereWCS 1 Bolt Clamp Kits, Suita all Ritchey WCS 1 Bolt Systems. Found on many Track Frames, including the Argon18 TKO, RIO. If you're unsure what clamps you have, remove them from the post, smooth clamps are for alloy rails, ridged clamps are for carbon rails. Some saddles recommend the use of smooth clamps on carbon saddles, check with your manufacturer for more info on which suits your saddle best.