Kadeena Cox got the better of fellow Rio Paralympic gold medallist Sarah Storey to win gold on the opening day of the Track World Cup in London.
Cox clocked 36.671 seconds in the women's C4-5 500m time trial with 14-time Paralympic champion Storey managing 38.309.
Fellow Briton Jody Cundy won the men's C4-5 1km event and helped the GB squad win the team sprint.
There was also gold for tandem pair Neil Fachie and Matt Rotherham.
Para-cycling events are making their debut at a World Cup with the hope they can become a more permanent fixture.
Cox won the C4-5 500m event in Rio, where Storey was fourth, before going on to take athletics gold in the T38 400m.
She has only recently returned to training after a knee problem and was thrilled with her performance.
"It was a surprise to put in a half-decent time after only being back for eight weeks," she told BBC Sport.
"It's quicker than I have been going in training and to perform on the big stage is what I like doing.
"I like to beat Sarah every now and then. It's not her main event but I will take this one."
There were also silvers for Megan Giglia (C1-3 500m) and Finley Graham (C1-3 1km) with bronzes for Katie Toft (C1-3 500m) Louis Rolfe (C1-3 1km) and Jon Gildea (C4-5 1km) as well as for Storey's husband Barney and Matt Ellis in the tandem sprint.