tonon finished his first tour de france for carrera, where he rode alongside guido bontempi, in 1982 as 116th. he was again selected for the 1984 tour de france where in the 19th stage he collided with a tourist while descending the col de joux-plane. he was transferred to annecy hospital with a fractured skull where he would stay in a coma for a couple of months and was eventually handicapped for life.