Amazon.com: G-SAVR 2-Pack: Lanyard/Tether/Leash - for Your Garmin Edge 200, 500, 510, 520, 800, 810, 1000 - Also for Wahoo, Polar, Lezyne, Cateye, Sigma, or Any Other Cycling Bike GPS Computer : Electronics
Garmin Bike Speed 2 and Cadence Sensor 2
Garmin Varia™ RTL 500 Bike Radar Bundle ANT+ enabled radar tail light and handlebar-mount display at Crutchfield