Woodstock (New York), July 28 (AP): Bob Dylan tumbled from a Triumph motorcycle on a sunny Friday morning here 50 years ago on July 29, 1966. The banged-up musician holed up in the mountains of upstate New York for months afterward, dramatically altering the rocket ride of his career.

It's the most analysed motorcycle crash in pop-culture history, but details have been as hard to pin down as the meaning of a Dylan lyric. Biographers, reporters and Dylanologists digging into the '60s period when the singer-songwriter lived in this arts colony with his young family have uncovered sometimes contradictory information.

The sun got in his eyes. The bike slipped on an oily patch. He flew off the bike. He simply tipped over. He broke his back. He got a concussion. That is, unless he didn't really hurt himself. Or maybe the crash was a tall tale.

Dylan has talked about the crash, but often in general terms. "I had been in a motorcycle accident and I'd been hurt, but I recovered," he wrote in his memoir, Chronicles. The few witnesses have remained tight-lipped.

Ambiguity surrounding an accident that indelibly marked the 25-year-old's life and music has helped it take on near-mythic dimensions.

Initial reports were sketchy.

A two-sentence story published four days later in The New York Times under the headline "Dylan Hurt in Cycle Mishap" said he was under a doctor's care. Rumours sprouted over the following months that he was gravely injured, blind or disfigured. Over the years, Dylan has indicated that he broke a vertebra and got a concussion.

But without a police report, there is no official record of the crash. It's possible Dylan crashed shortly after pulling out of the Woodstock home of his manager, the late Albert Grossman. Howard Sounes writes in Down the Highway that Dylan was being followed in a car by his wife, Sara, who took her injured husband back to Grossman's house.

Grossman's wife, Sally, was there and saw Dylan "kind of moaning and groaning" but noticed no obvious signs of injuries, according to Sounes. Sally Grossman declined comment for this article.

A likely spot for the crash is along or near Striebel Road, a winding, hilly ribbon of road running by that house.

Dylan was driven about an hour to Middletown to the home of a doctor he knew, Dr. Ed Thaler. Dylan arrived "very upset", the doctor's widow, Selma Thaler, said in an interview with The Associated Press. "He didn't want to go to the hospital, so we said, 'You can stay here.'"

Dylan stayed in a third-floor bedroom of the Thaler home for about a month, eating dinner with the family and having friends over on Friday nights, including Allen Ginsberg and the musicians who would later become famous as The Band.