Kleinhans, riding in the colours of RECM, won the men’s 60km race in a time of 2:36:41. He was followed home by Derrin Smith, with Nicol Carstens third.
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De Groot took the women’s title for Ascendis Health in 3:00:35. Louise Ferreira claimed the runner-up spot, while Diana Carolin rounded out the podium.
“Winning close to home is always great,” said Kleinhans.
“The racing here suits me well. I enjoyed the punchy climbs and the flowing single track.”
De Groot described the event as “a proper mountain bike race”.
“You need to be fit to enjoy it. It’s soul candy for a mountain biker.”