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The Sonic/Ergo is designed to present minimal frontal area to create as little aerodynamic drag as possible
• 3mm thick
Shoe Technology: Dual X-Comfort Zone and Power Zone technologies
The Roubaix Gel 2 offers our thickest gel padding and hand protection
0 2″ is all aluminum
SRAM XG-1290 Cassette, 12 spd over-40 The Sonic/Ergo is designed toThe workhorse of X Range gearing. The SRAM RED XG 1290 cassette progresses fluidly and quickly through a wider range of gears. It's specifically designed for wireless electronic shifting and the one piece design offers you the best in weight savings. FEATURES Updated design for smoother and faster shifting More gradual gear progression between cogs at least five one tooth jumps while still offering a wider range 10 tooth start helps provide a wider