sram quarq spider red e1 my25 fur threaded mount kettenblatterThe SRAM Quarq Spider RED E1 MY25 is a premium power meter designed for cyclists who demand maximum precision and reliability in training data analysis. Thanks to its unique threaded disc mount system, the design is lighter and stiffer, without compromising the ease of disc replacement. The dual sided measurement system ensures accuracy of 1. 5% , regardless of changing weather conditions, and the impressive battery life allows for long term use