More record claims

I have just been sent a URL with the following record claims:

Stefan Gauler (Switzerland): one hour unicycling 20220 m (12 mi 997 yd) on a
standard unicycle one hour unicycling 16048 m (9 mi 1714 yd) on a “giraffe”
unicycle 24 hours unicycling 279.274 km (173 mi 1003 yd)

Can anyone provide more information about these records (when, where, who was
watching) or Stefan Gauler (email address, home page, city)?

The URL is

Julian <- My preferred email address.