Ive gone 120+ on the track with mine being fine. Most who loose them loose them at like 70 mph. So its either on there good, or bad. I would suggest a dot of super glue on each corner and the bottom. That way its in there all summer for good, but you can still pop it off with a little effort. Then again... ive gone faster... but the top was up
so in theory its good to infinty mph