According to Official Guinness Records,
The highest speed on a wall of death is 125.77 km/h (78.15 mph) and was achieved by Guy Martin (UK), on the set of Channel 4’s Guy’s Wall of Death: Live (North One TV, UK), in Louth, Lincolnshire, UK, on 28 March 2016. Guy completed the record breaking revolution in 3.41 seconds. He was subject to forces of 5.2G during his attempt.Full story: British motorcycle racer Guy Martin smashes Wall of Death world record after reaching 78 mph
For a complete list of 2016 records, please visit 2016 Guinness Records in United Kingdom.