Richard Brent Caldwell, 59, died after he lost control and crashed over his bicycle's handlebars in Christchurch on October 8, 2015.

A "keen and experienced" cyclist was killed because of several issues with his bike, a coroner's report has found.

Richard Brent Caldwell, 59, died when he lost control and crashed his bicycle on Christchurch's Evans Pass Rd, near Summit Rd, on October 8, 2015.

Coroner Tim Scott's findings into Caldwell's death, released on Monday, said a worn front wheel bearing, over-inflated tyres, rim wobble and the seat position all contributed to "de-weighting" the front wheel before Caldwell went over the handlebars.

Caldwell's wife, Trish Hills-Caldwell, told police her husband had been cycling for about eight years.

READ MORE: Killed cyclist Richard Caldwell went over handlebars on Evans Pass Rd

Caldwell, who had Wednesdays off work, would often ride for most of the day. He also rode two evenings each week during summer if the weather was good.

Caldwell was "very keen" to keep his bicycle serviced and running well.

A computer fitted on the bike showed Caldwell started his journey at 7.19am on the day of the crash. Two hours and 40 minutes later, 17.4 kilometres away from home, he crashed while travelling at 74kmh.

Helen Murray was driving up Evans Pass Rd before going for a mountain biking trip when she drove past Caldwell. She saw him coming down the hill "clearly out of control".

The front wheel of Caldwell's bike was wobbling violently and he was holding the handlebars trying to control the bicycle. She saw him fly off the bicycle and hit his head on the road. She immediately called emergency services.

Paul Bolger was cycling uphill when he noticed Caldwell's front wheel and handlebars wobbling.

Caldwell passed Bolger without saying anything. When Bolger turned around Caldwell had lost control and was lying on the road.

He tried to give Caldwell first aid and called the local medical centre. A doctor arrived shortly after but there was nothing she could do.

Caldwell's bicycle was inspected by a qualified and experienced bicycle mechanic after the crash.

The mechanic found the front wheel bearing was worn, the tyre was overinflated, and the rim was out of alignment – all causing the front wheel to wobble.

The wobble worse because the seat was set as far back as possible, shifting Caldwell's weight from the front to the rear of the bicycle.

He was travelling fast, increasing the wobble further until he lost control and went over the handlebars.

The coroner said Caldwell was a "keen and safety-conscious recreational cyclist", who wore the appropriate safety gear and had his bike regularly checked.

He was satisfied the problems with the bike must have happened relatively recently before his final ride.

The coroner said he doubted Caldwell would have deliberately travelled downhill so fast.

"I think that was one of the signs that he had got himself out of control.

"Perhaps he had underestimated the steepness of the road and was unable to control his speed."

The coroner made no recommendations in his report.