Can I buy just the XX1 power meter spider for my existing S-Works mountain bike crank?

Unfortunately no. The SRAM XX1 Eagle power meter uses a proprietary crank to spider interface and can only be installed on the Quarq XX1 crank arms. 

Quarq DOES NOT offer a mountain bike power meter that can be mounted to the S-Works MTB crank.  

To use a Quarq power meter you would need to purchase a SRAM XX1 Eagle Power Meter chassis (power meter and crankarms). The Quarq XX1 chassis would then take the place of the S-Works mountain crank. 

To see the full specs of the XX1 power meter, visit the Quarq website here, or visit your local SRAM dealer for more information. 

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