Conversation so far:
how much success did Sean Kelly (cyclist) have on the grand tour?
Kelly won his only grand tour, over West German Raimund Dietzen and also won the points competition.
did he have any failures?
his team struggled in the second stage, losing the influential rider Thomas Wegmuller to dysentery.
what team was he on?
Fagor-MBK.
who were his teammates?
CANNOTANSWER.
how many times did he lose in the grand tour?
Kelly won his only grand tour.

Question: what year did he participate in the grand tour?
Self-contained rewrite: What year did Sean Kelly participate in the grand tour?