Shimano’s Dura-Ace R9300 surfaces as 13-speed, semi-wireless at the Vuelta

Cyclingnews reports a prototype Shimano Dura-Ace R9300 groupset has been spotted on Alpecin-Premier Tech bikes at stage 1 of La Vuelta a España. The photos indicate a 13-speed rear cassette and a redesigned shifter with a protruding thumb button, with a semi-wireless setup (shifters wirelessly communicate to derailleurs via a battery in the frame) rather than a fully wireless system. The leak suggests a new freehub body will be required, alloy cranks similar to current designs, and potential 1x compatibility, though exact cog sizes and final specs remain unconfirmed.