IROC X was the tenth year of IROC competition, which took place in 1986. It saw the use of the Chevrolet Camaro in all races, it was the final season that television coverage was on CBS, and continued the format introduced in IROC VIII. Race one took place on the Daytona International Speedway, race two took place at Mid-Ohio, race three ran at Talladega Superspeedway, and race four concluded the year at Watkins Glen International. Al Unser Jr. won the championship and $164,100.
The roster of drivers and final points standings were as follows: IROC season statistics at racing-reference.info , Retrieved March 9, 2007
| Champ Car 2nd in 1985 IndyCar points |
| NASCAR Winston Cup Series 1985 Daytona 500, 1985 Winston 500, & 1985 Southern 500 winner 1985 Winston Million winner 2nd in 1985 Winston Cup points |
| NASCAR Winston Cup Series IROC VIII |
| Champ Car 1985 IndyCar Champion IROC V |
| NASCAR Winston Cup Series 1985 Winston Cup Champion |
| NASCAR Winston Cup Series IROC IX |
| Champ Car 3rd in 1985 IndyCar points |
| IMSA Camel GTP 1985 24 Hours of Le Mans Winner |
| World Sports-Prototype Championship 1985 World Sportscar Co-Champion |
| IMSA Camel GTP 3rd in 1985 IMSA Camel GTP points |
| World Sports-Prototype Championship 3rd in 1985 World Sportscar Championship |
| Champ Car 10th in 1985 IndyCar points |
| 26 (5) |
| 17 |
| 14 |
| 12 |
| 10 |
| 9 |
| 8 |
| 12 (3) |
| 6 |
| 5 |
| 4 |
| 3 |
Average speed:
Cautions: 2
Margin of victory: 40 feet
Lead changes: 1
Lap Leader Breakdown
| 30 |
| 10 |
| 26 (5) |
| 17 |
| 14 |
| 12 |
| 10 |
| 9 |
| 8 |
| 7 |
| 6 |
| 5 |
| 4 |
| 3 |
Average speed:
Cautions: none
Margin of victory: 2.87 sec
Lead changes: 0
| 26 (5) |
| 17 |
| 14 |
| 12 |
| 10 |
| 9 |
| 8 |
| 10 (3) |
| 6 |
| 5 |
| 4 |
| 3 |
Average speed:
Cautions: none
Margin of victory: 1 cl
Lead changes: 1
Lap Leader Breakdown
| 8 |
| 30 |
| 24 (3) |
| 19 (2) |
| 14 |
| 12 |
| 10 |
| 9 |
| 8 |
| 7 |
| 6 |
| 5 |
| 4 |
| 8 (5) |
Average speed:
Cautions: none
Margin of victory: 3 cl
Lead changes: 3
Lap Leader Breakdown
| 15 |
| 1 |
| 14 |
|
|