SingleSpeed 142x12/148x12 Swinging Dropout Insert optimus Left side 142x12/148x12mm insert for

Left side 142x12/148x12mm insert for 160mm brake rotors

lightweight and the buzzing sound from the

LENGTH (inches) WIDTH (inches) CHEST (inches) XS 27 16 ½ 31-34 S 28 18 34-37 M 29 20 38-41 L 30 22 42-45 XL 31 24 46-49 2XL 32 26 50-53 3XL 33 28 54-57

and predictability

20T Cog and spacer kit

SingleSpeed 142x12/148x12 Swinging Dropout Insert optimus Left side 142x12/148x12mm insert forRight side 142x12 148x12mm geared insert (only right side, no derailleur hanger!) This dropout insert has threads that are M12x1. 5 and will work with either your 142mm spaced frame or a boost 148 spaced frame ***This will ship the week of April 6th, 2026