The Odysee Seatpost Rack does not require braze-on mounts or threaded dropouts, just fix it to your seatpost.  This rack is super easy and quick to install.  The four bolt clamp securely fastens and will carry up to 55lbs.

Fits seatposts from 25.4mm~33.0mm
390mm x 150mm platform area
Weight = 1080g
Available in Black or Silver
Capacity: 25kg/55lbs