There is one, cycling PR, I would love to beat and that is the biggest elevation gain in a single cycle!
Right now that stands at 1,634 metres. Which I set while doing the End to End cycle on day 8, which took me from Carlisle to Slaidburn!
You can check out the route at connect.garmin.com/modern/activity/11905861 and www.strava.com/activities/445506922.