Mr. Kadet crashed about 12:30 p.m. while headed east on Woodside Road near the intersection with Northgate Drive in Woodside in what a witness said was a solo accident, according to a San Mateo County Sheriff's Office report.
He was in the bike lane when his bike began to wobble and he fell over into the lane of traffic, the witness told deputies, adding that she had seen the accident through her rear view mirror.
The witness had traveled about 100 feet past Mr. Kadet, Lt. Ray Lunny told the Almanac. "She was shocked because the bicyclist appeared to be in control of his bike," he said.
Mr. Kadet was wearing a helmet, deputies said. He and his riding partner had a regular Sunday morning routine of a 25-mile-to-40-mile bike trip, deputies said.
The partner returned to the scene after discovering Mr. Kadet's absence when stopped at the Alameda de las Pulgas, deputies said.
Deputies are estimating Mr. Kadet's speed at the time of the accident as having been between 30 mph and 40 mph, deputies said.
The Sheriff's Office has no details on Mr. Kadet's condition.
Medics from the Woodside Fire Protection District treated Mr. Kadet at the scene and took him to the hospital.