the Astr RS helps racers conserve energy and hit the finish line with more power than the competition

UDH – bikes with a UDH derailleur will require a Restrap Switch UDH adaptor (available separately)

A reengineered tread pattern designed for all-out speed

Zipped front fly and snap fastening

The Orondo Grade is tubeless-compatible

magene h603 heart rate monitor Mog the Astr RS helps racersThe Magene H603 Heart Rate Monitor (Chest) helps you accurately monitor your heart rate while exercising. Key Features of the Magene H603 Heart Rate Monitor (Chest): Accurate Real time Heart Rate Monitoring Choose between various colors Split chest strap design to bring you a better product experience Long Battery Life, Lasts for 1000 Hours Support Dual Protocol of ANT+ and Bluetooth allows connection to most devices.