Controltech's Di2 battery holder provides secure and lightweight seatpost battery storage. At only 6 grams, the ribbed rubber holder easily slips inside your seatpost, both securing and providing natural vibration damping for the Di2 internal battery. Available to fit external post sizes from 27.2mm to 31.6mm.
|Size 27.2mm||27.2mm outer diameter posts|
|Size 30.9/31.6mm||30.9/31.6mm outer diameter posts|