Ive had well over 100lbs on the roof. With the blanket removed, this sound came through so clear. The sound quality is high as the same H1 chip is used as in the Apple EarPods. I Love the fit! AmazonBasics products deliver once again! Thankfully Amazon has enough flexibility to make up for customers like me who sometimes just screw things up. Cant ever seem to get the strap adjustment right. As most fabric stretches when it touches water. On other occasions the calibration screen directed me to pedal at speeds up to 25 mph and after several minutes cycling at speeds below 25 mph I do not observe any change in the screen. lastly, there is a bit of side to side play where the bike support arms mount to the upright.