Elevn Aero Extender Seat Post (25.4mm & 27.2mm)

25.4mm Specs:

Aero seat post extension for recovery designed to fit CHASE aero tubed frames exclusively.
Length: 495mm / extension: 325mm.
Diameter: aero 25.4mm for CHASE RSP 5.0, 4.0, & 3.0 Frames (Mini, Junior, Expert only).
Requires an additional aero seat clamp. Use the 25.4 Aero Seat Clamp w/ this post extender

27.2mm Specs:

Aero seat post extension for recovery designed to fit CHASE aero tubed frames exclusively.
Length: 495mm / extension: 325mm.
Diameter: aero 27.2mm for frames CHASE ACT 1.2 & 1.0, RSP 5.0, 4.0,& 3.0 (expert XL & larger sized frames) & ELEMENT w/ aero seat tube
Requires an additional aero seat clamp. Use 27.2 Aero Seat Clamp for this post & the Frames listed.