One one? Really? Perhaps you know more about this than I do.
http://www.grandprix.com/gpe/rr436.html
On lap 63 the battle became one for the lead, when Rosberg suffered a right rear tire failure. Mansell was on course for the title when two laps later his left rear tire exploded at 180mph. Nigel managed to avoid hitting anything by his championship hopes were over. Williams had no choice but to call Piquet to the pits and so Prost went into the lead.
Or:
http://en.wikipedia.org/wiki/1986_Australian_Grand_Prix
Fearing the same happening to the second car, Williams called Piquet to the pits and Prost took the lead.
To summarise:
Lap 63: Rosberg retires - due to tyre failure
Lap 64: Mansell retires - due to tyre failure
Lap 65: Piquet pits to change tyres. - Why is that?
Adelaide was an abrasive street circuit. If Mansell's tyre hadn't blown he would have been World Champion. Prost wasn't catching him towards the latter stages of the race.