PARTS AND ACCESSORIES › OVERFAST 5g Ultralight Battery Holder Cover for Colnago Y1RS - Carbon Fiber Shimano Di2 & Sram Image 1 of 6 Image 2 of 6 Image 3 of 6 Image 4 of 6 Image 5 of 6 Image 6 of 6 OVERFAST 5g Ultralight Battery Holder Cover for Colnago Y1RS - Carbon Fiber Shimano Di2 & Sram from $90.00 An ultralight 5g CNC carbon battery holder cover for the Colnago Y1Rs.Approx. 5.1g (SRAM) / 10g (Shimano)Fits all Colnago Y1Rs versionsCNC carbon with titanium screwsMatte black Option: Select Option For Shimano Di2 Battery Holder For SRAM (Without Di2 battery holder) Carbon Finishing: Select Carbon Finishing [New] Forged Carbon Purchase Added! An ultralight 5g CNC carbon battery holder cover for the Colnago Y1Rs.Approx. 5.1g (SRAM) / 10g (Shimano)Fits all Colnago Y1Rs versionsCNC carbon with titanium screwsMatte black