The 386 EVO Thread Together Bottom Bracket is an angular contact BB designed to fit most 24/22mm (SRAM/GXP) cranks. It is compatible with Quarq DZero powermeter spiders that have GXP spindles, with the exception of Eagle MTB. However, it is not compatible with certain Quarq and SRAM/GXP cranksets, including Elsa, Riken, SRAM Red 22, SRAM S975, SRAM S2275, CinQo Saturn, and Saturn2. It is important to note that Quarq spiders with an ID less than 49.5mm may rub on the BB cup. To install, only use bottom bracket tools compatible with 16-notch MegoEvo BB's, such as FSA MegaEvo and Park Tool BBT-29.