A cyclist has reached more than 174mph (280km/h) after being released from the back of Porsche on an airfield runway.
Neil Campbell, 45, broke a previous record of 167mph, using a specially-built, £15,000 bike.
The architect from Essex was pulled along at Elvington Airfield in North Yorkshire by the Porsche Cayenne, then released to go through the timing gate under his own power.
The previous record for a man was set by a Dutch rider in 1995.
Mr Campbell, of Little Horkesley, said he was "thrilled and relieved" to achieve the fastest bicycle speed for a male in a slipstream.
He said "the team worked amazingly well".
Mr Campbell was measured at 174.33mph.
The elongated, custom-built bike was based on the design of a tandem and built using parts from a motocross bike.
There was a large attachment on the back of the Porsche, to help Mr Campbell build up speed along the two-mile (3.2km) track.
"Porsche spend millions testing their cars in a wind tunnel and we stick a big Tupperware box on the back of it," he said.
Mr Campbell wore a kangaroo-skin protective suit during the challenge.
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We did it. Just back from Elvington and this is the first chance we’ve had to reflect on our achievement, a new world record. Records are difficult to break because they push the limits of human endeavour, team work and technology. We were certainly on the limit with all of these. Add in awful weather during Friday’s test day and we genuinely thought the target of 170mph would be beyond our reach. By 10am on Saturday we incredibly managed to change our circumstances and the virtual aerodynamic modelling we had applied and the new pace car from Porsche gave us the chance to break the record held previously for 24 years. We are all happy and overwhelming relieved to now be at this stage - 174.339mph. A New Men’s World Record. The next goal is to go over 200mph. With so much at stake at these speeds the support of others is critical. #whatateam #tonamejustafew Jon from @fenwicksbike caring for the car, bike and above all the rest of the team. @grant.l.wildman from @schwalbetyresuk doing supply runs for food and materials. Rich from @physioatthelodge and his incredible taping skills (look closely at the canopy). @jrcroxford from @harperadamsuni with his unique engineering insight. @adamroberts covering all the film footage and data. Adey from @adey_dent stepping in last minute as driver. And of course the #thebravestmaniknow Neil Campbell @operationpacemaker
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The evidence from Saturday's record bid will be submitted to Guinness World Records.
Mr Campbell's next challenge is to try to break the overall record, held by Denise Mueller-Korenek.
The American reached 183.932mph (296.010km/h) on her custom-made bike in September 2018.
Mr Campbell said he would try to reach 220mph (354km/h) next year on a six-mile track at the Bonneville Salt Flats in Utah, USA, where Ms Mueller-Korenek achieved her record-breaking feat.
He said: "This has been a five-year programme and the record was the culmination of one part of it.
"We have been bound by finances and budgeted to do what we can. Our plan is now to go to Bonneville and use a longer test track."