Compatible with all Sram Road DUB BBs, DUB:BSA73, PF89.5, PF92, PF30 MTB73, BB30 MTB73, and BSA MTB68SP Bluetooth low energy technology and ANT+ wireless data transfer MagicZero - automatically checks and recalibrates your power meter as you ride � no need to manually calibrate AxCad - no cadence magnet required 200-hour battery life on common CR2032 battery OmniCal technology allows swapping of chainrings without affecting accuracy DZero dub is designed for the most major brands of 10- and 11-speed chainrings XX1 Boost and non-Boost power meter spider must be paired with a XX1 Eagle DUB 8-bolt crankset and a 104BCD X-SYNC 2� chainring DUB 104bcd BlackUPC/EAN/GTIN: 710845839467