Wisconsin Challenge Trophy Race
Wauwatosa Road Race Course
7.88 Mile Road Course
22 Laps/173.36 Miles
October 5, 1912
| Finish | Start | Driver | Car # | Sponsor/Name | Chassis | Engine | Laps | Status |
Points |
| 1 | 3 | Harry Endicott | 5 | Mason | Mason | Mason | 22 | 3:06:44.79 55.700 | 350* |
| 2 | 2 | George Mason | 3 | Mason | Mason | Mason | 22 | 3:42:40.35 46.713 | 185* |
| 3 | 1 | Ray Snyder | 2 | Mason | Mason | Mason | 3 | Clutch trouble | |
| -- | -- | John Heber | 4 | EMF | EMF | EMF | -- | Withdrew | |
| -- | -- | Frank Kulick | 1 | Ford | Ford | Ford | -- | Withdrew | |
| -- | -- | Clarence Cramer | 3 | Mason | Mason | Mason | -- | Driven by Mason |
Known riding mechanics in this race:
| Finish | Start | Driver | Mechanic | Car # | Sponsor/Name | Chassis | Engine | Laps | Status |
| 1 | 3 | Harry Endicott | Jim McNamara | 5 | Mason | Mason | Mason | 22 | 3:06:44.79 55.700 |
| 2 | 2 | George Mason | Gay | 3 | Mason | Mason | Mason | 22 | 3:42:40.35 46.713 |
| 3 | 1 | Ray Snyder | Klingler | 2 | Mason | Mason | Mason | 3 | Clutch trouble |
| -- | -- | John Heber | Wells | 4 | EMF | EMF | EMF | -- | Withdrew |
| Lap Leaders | Total | Laps |
| Harry Endicott | 21 | 2-22 |
| Ray Snyder | 1 | 1 |