All the rides listed on this site are documented, witnessed and have either been certified by the IBA, are currently pending certification or are of an IBA distance and verified some other way without certification. An example of the latter would be a Long Distance Rally.
SS1600K: 1600km in 24hrs
SS2000K: 2000km in 24hrs
SS2000M – 2000 miles (3220kms) in 48 hrs
BB2500K: 2500km in 36 hrs
Extreme rides are rides that take most of 24 hours, are more than 48 hours in duration. This doesn’t necessarily coincide with the IBA’s definition, for example I consider riding a 125cc bike 2000km in one day extreme, usually an SS2000K is not considered so.