Katie-George Dunlevy and Eve McCrystal won their second gold medal of Tokyo 2020 when the dominant duo triumphed in the B road race at Fuji International Speedway.
The 92.4km contest took place in treacherous conditions, with a number of crashes marring the race.
Dunlevy and McCrystal were engaged in a cat and mouse tactical battle at the head of affairs with the British pair of Sophie Unwin and Jenny Holl.
However, Unwin and Holl had no answer to Dunlevy and McCrystal's devastating burst of acceleration on the final lap, with the Team Ireland stars triumphing in a time of two hours 35 minutes and 53 seconds.
Great Britain and the Swedish pair of Louise Jannering and Anna Svaerdstroem were involved in a nip-and-tuck battle for silver, with Unwin and Holl just edging out the Swedes, who rounded out the podium.
Dunlevy and McCrystal also captured gold in Tuesday's time trial to retain the title they won in Rio five years ago, while the inspirational pair also seized silver in the B 3,000m individual pursuit last Saturday.
"The road race is my favourite and I've always wanted to win that at the Paralympics," a euphoric Dunlevy told RTÉ Sport after a series of near misses in the event.
"In London I was fifth in the road race, and then I got silver in Rio. To win it in Tokyo is a dream come true.
"It was a really challenging race. The Swedish were really technically very good and on the downhills we were losing ground to them. If they went ahead of us, we had to use a lot of effort to get it back.
"It was a lot of on-off efforts and it was really draining as the laps went on.
"There was a chance there and we just had to take it. That was to attack really on that last climb coming in. We did, and we got a gap, and I just can't believe it held off to the line.
"I was fading off quickly though!"
The 39-year-old also reflected on her vision loss in her moment of glory, offering a message of hope to those currently struggling with visual impairments.
"I struggled at school, I found school really hard," she admitted. "I was diagnosed at 11 – I would have liked to have been able to say to my younger self then that everything is going to be OK – great things can happen.
"Just believe in yourself and there are things you can do, and that is what I would tell someone young with sight issues at home watching this."
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McCrystal added: "I can't believe it because as a pilot I found that course so stressful in the rain.
"As Katie said, we were losing ground on the descent. The climb I found tough because of the on-off during the race.
"I just said to Katie with about 2km to go that we're going to have to kick the last little drag up because the British bike are the current world champions. I didn't want to take them to the line so we had to chance it.
"We chanced it, we got a gap, and we just went for it and I cannot believe we did that.
"I didn't really feel the rain too much. I was just concentrating on staying upright and the Swedish girls really put it to us on the corners.
"Double Paralympic champions – oh my God almighty – never in my wildest dreams!"
There was disappointment for Martin Gordon and Eamonn Byrne in the men's edition of the B road race, after the Team Ireland representatives failed to finish, withdrawing early after struggling in the conditions.
The sprint specialists showed their class earlier in the Games with a personal best and a fifth-place finish in the B 1000m time trial.
Gordon was far from downcast, and said: "It's been an incredible experience from start to finish, the whole summer culminating in, when it came down to it, when it mattered we delivered on the track and, in and out, day in day out, it’s just been a wonderful experience."
Byrne, who pilots the tandem duo, said: "You think about it so long – this is not our first major competition –we've been to four Worlds since 2017 and oftentimes we haven’t performed, but we absolutely nailed it this time and at the right time, it’s a great feeling, I don’t have a single 'what-if' or niggle walking away from it and I think that’s not often you can say that as an athlete. So, really happy."