Specialized Speedzone ANT+ Power Spider

* Works with all ANT+ compatible computers.
* Developed with Quarq, utilizing an advanced digital strain gauge matrix system.
* Calibrated to 0.5% accuracy.
* Typical S-Works crank system can weigh less than 720g with SpeedZone ANT+ Power Spider.
* Spider weight: 130g.
* Adds less than 50g over a standard S-Works spider.
* Self-calibration mode at startup to maintain accuracy.
* Also compatible with following devices: Garmin, SRM, Suunto.
* User-replaceable battery CR2032 has typical runtime of 300+ hours.