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Who ADRIAN DENT, NEIL CAMPBELL
What 280.571 KILOMETRE(S) PER HOUR
Where UNITED KINGDOM(ELVINGTON AIRFIELD)
When 18 AUGUST 2019
The fastest bicycle speed in a slipstream (male) is 280.571 km/h (174.339 mph) and was achieved by Neil Campbell (UK) at Elvington Airfield in Yorkshire, UK, on 18 August 2019.
The previous record of 268.831 km/h (166.944 mph), by Fred Rompelberg (Netherlands), has not been broken since 1995.
The vehicle used for the slipstream was driven by Adrian Dent (UK).


Van de site van Guinness book of records. Dus helaas, downhill is dus niet geldig, slipstream wel.

Who Eric Barone
What 172 kilometre(s) per hour
Where Nicaragua ()
When 12 May 2002

The fastest ever speed attained cycling downhill on soil is 172 km/h (107 mph), by Eric Barone (France) descending the Cerro Negro volcano in Nicaragua on 12 May 2002.

Dus wel volgens bovenstaande redenering.