Quarq DZero for Specialized replaces the factory spider on Specialized’s S-Works carbon crankset. It is compatible with cranksets from 2013-CurrentDZero is Quarq’s next-generation power meter platform for those who live to be challenged, pushed, and tested in the toughest scenarios imaginable. Now Quarq has introduced a DZero spider designed to replace the factory spider on Specialized’s S-Works carbon crankset.Quarq DZero for Specialized embodies 10 years of Quarq advances in power meter technology, plus new features such as dual Bluetooth low energy and ANT+ wireless data transfer, revised circuitry, a new strain gauge design and the Qalvin BLE app. You also get AxCad accelerometer cadence, the easy-to-replace CR2032 battery, an IPX7 waterproof rating and a 2-year warranty.Key Features:Bluetooth low energy technology and ANT+ wireless data transfer.,AxCad – no cadence magnet required.,10K Temperature Compensation.,Battery – CR2032, 200-hour battery life, change without tools.,Power Balance.,OmniCal – swap chainrings without affecting accuracy.,2-year warranty.,IPX7 waterproof rating.,Accuracy – within 1.5%, measuring both legs.,Free firmware upgrades with the Qalvin app,Traditional 5-arm spider compatible with Specialized S- Works Carbon Road Crank Arms from 2013-Current.,Available in 130 BCD and 110 BCD.,Replaces the standard spider.,A Specialized lock ring tool is required for installation..