The NG MTB SRAM single power meter spider (boost) is the power meter for all mountain bikers who already use a direct mount SRAM single crank set or a modular SRAM crank set with a Q-factor of 168mm (these cranks use 3 bolts to tighten the spider). This power meter also works with Truvativ cranksets. Please note, that the power meter replaces the direct mount chainring. You will need a new SRAM compatible chainring with BCD 104.
The NGeco MTB SRAM single power meter (boost) spider is for the boost chain line.
With rechargeable battery.