Radar Frog Hollow Bikes and the OPEN April 2, 2020 What is a gravel bike best used for? This video from Frog Hollow Bikes takes us on their local gravel ride with the OPEN. Related • Radar Get Lost 5 Radar All Roads from Flagstaff to the Grand Canyon • Radar OG Rock Combo Commercial 2 Radar RideWrap Gravel Bike Protection Kits 1 Radar Finding Myself Video 16 Radar Focus Bikes: Atlas Aluminum Gravel Bike