Course record holder Ollie Hucks (Saint Piran) was quickest at the Maidenhead & District CC 29.5 despite riding a road bike, while Kate Allan (Team Bottrill) was the fastest woman over the course near Freith in Berkshire.
Hucks, aged 24, won his first open time trial event of the season recording a winning time of 1-10-23 in the road bike category.
The H29/18 saw competitors complete a 29.5-mile looped course starting near Lane End on the B482.
Riders then headed out to Stokenchurch before joining the A40 and then heading back south on Christmas Common Road past Shirburn Wood.
After re-joining the main roads competitors headed back down to Henley-on-Thames and then Marlow before rising to the finish.
A small field were met by cold conditions unfavourable for fast times. Hucks set the course record of 1-02-37 in much faster conditions in September.
On this occasion Hucks was competing in the road bike category but was the quickest rider overall on the day clocking 1-10-23.
Allan, aged 38 and from nearby Maidenhead, won three women’s national titles last season and got her season underway by winning the time trial category in the second fastest time of the day in 1-11-29.
Allan also set the women’s course record of 1-09-19 last season but was well off that mark in her season opening event.
Under-23 rider Theo Tadros (trainSharp) was second in the time trial category clocking 1-13-34, while second woman Charlotte Hodgkiss-Byrne (Team Boompods) was third overall in 1-19-28.
Simon Barbour (AS Test Team) was second male in the trial trail category clocking 1-19-45 while Crispin Knill (Maidenhead & District CC) was third (1-21-34).
Para-cyclist Ben Payne (Maidenhead & District CC) showed his early season form stopping the clock in 1-22-57.
Veteran rider Beth Thompson (Cowley Road Condors CC) was third woman in the time trial category clocking 1-35-06.
Hucks was clear winner in the road bike category ahead of Sean O’Mahony (High Wycombe CC) in second while veteran Drew Sheffield (Fulfil The Potential Race Team) finished third.
The Chichester City Riders pairing of Larry Wiltshire and James Smee were the only 2-up pair stopping the clock in 1-14-14.
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