Sir Bradley Wiggins comfortably defeated Team Sky team-mate Geraint Thomas to win the British national time trial title for the third time.
Wiggins stopped the clock on a hilly 42km course in Wales in a time of 53min 56sec, which was 1min 8sec faster than runner-up Thomas and 1min 21sec quicker than third-placed Alex Dowsett, the defending champion.
Wiggins was already 38 seconds ahead of Thomas, his nearest challenger, at the half-way mark and defied heavy rain to extend his lead on the second of two laps around Celtic Manor, near Newport.
Veteran rider David Millar, who is riding at his final national championships before retirement, retired from the race at just over half distance in order to aid his recovery from a cough ahead of Sunday's British national road race.
"It was full commitment today," said Wiggins after taking victory. "Any time trial you go into as Olympic champion, especially at the British championships, you want to win it.
"This is probably the best British championships they've ever had in terms of the field and the way the event's been run.
"I think G (Thomas) was perhaps the rider I feared most today, especially on home soil and the form he's in. I didn't take anything for granted today."
British men’s national time trial result
1 Sir Bradley Wiggins (Team Sky), 53:56
2 Geraint Thomas (Team Sky), +1:08
3 Alex Dowsett (Movistar), +1:21
4 Luke Rowe (Team Sky), +3:01