I've had some high speed tank slappers back in the day on dirt bikes. Had one on a CT-90 but LOL not sure that classifies as a motorcycle and of course not at high speed. Had an old Yamaha MX-250 set up as a desert sled with tall gearing and a big tank. IDK what the top speed was but it was up there and that bike was the source of my biggest Oh F, F, F! tank slappers.