Then you'll need this adapter

including round and aero seatposts

Saves weight without the need for a separate spider

164g w/ straps

3 kg per bike

Hiplok D - Black PDP|Colour Then you'll need this adapterWearable Sold Secure rated D lock with integrated Clip & Ride system, slim profile and optimised sizing for ease of carrying on bag straps, belts or in pockets. With a 13mm hardened steel shackle, hardened steel body casing, and tough nylon outer shell, the Hiplok D is big on security and practicality. Specs: Security Level: High Risk Security Rating: Sold Secure Silver Award Product Specification: 13mm hardened steel shackle, hardened steel body