This suction cup mount can hold any GoPro Hero models on cars, boats, motorcycles, and much more! It's 3.4" diameter can has been proven to hold at speeds up to 150+ mph on clean surfaces. Now we're not saying you should be cruising down a back road at top speeds to see how well the mount holds, But this is a great mounting system to get your GoPro out of your hands and angled to where you need it most!
B&H Link: http://www.bhphotovideo.com/c/product/999131-REG/gopro_aucmt_302_suction_cup_mount.html