Masahiro Shimizu
Masahiro Shimizu is a Japanese former professional Grand Prix motorcycle road racer.
Originally from Fujisawa, Kanagawa Prefecture, Shimizu won the 1987 250cc All Japan Road Race Championship. He began his Grand Prix career with a win in 1987. His best season was in 1991, when he finished fifth in the 250cc world championship, riding on a Honda.
Motorcycle Grand Prix Results
Points system from 1969 to 1987:| Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Points | 15 | 12 | 10 | 8 | 6 | 5 | 4 | 3 | 2 | 1 |
Points system from 1988 to 1992:
| Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| Points | 20 | 17 | 15 | 13 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| Year | Class | Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Points | Rank | Wins |
| 1987 | 250cc | Honda | JPN 4 | ESP - | GER - | NAT - | AUT - | YUG - | NED - | FRA - | GBR - | SWE - | CZE - | RSM - | POR - | BRA 9 | ARG 3 | 20 | 13th | 0 |
| 1988 | 250cc | Honda | JPN - | USA - | ESP 5 | EXP 2 | NAT 4 | GER NC | AUT 6 | NED NC | BEL NC | YUG NC | FRA NC | GBR 9 | SWE NC | CZE 13 | BRA 9 | 68 | 10th | 0 |
| 1989 | 250cc | Honda | JPN 13 | AUS 14 | USA 10 | ESP 7 | NAT 11 | GER 3 | AUT 10 | YUG - | NED 11 | BEL 9 | FRA 7 | GBR 3 | SWE NC | CZE 2 | BRA 2 | 116 | 6th | 0 |
| 1990 | 250cc | Honda | JPN NC | USA 11 | ESP NC | NAT 8 | GER 6 | AUT NC | YUG 12 | NED 4 | BEL 9 | FRA 4 | GBR 2 | SWE 3 | CZE NC | HUN NC | AUS 8 | 100 | 7th | 0 |
| 1991 | 250cc | Honda | JPN 8 | AUS NC | USA 5 | ESP 4 | ITA 7 | GER 5 | AUT 6 | EUR 6 | NED 6 | FRA 6 | GBR 4 | RSM 4 | CZE 4 | VDM 5 | MAL NC | 142 | 5th | 0 |
| 1992 | 250cc | Honda | JPN NC | AUS NC | MAL 8 | ESP 3 | ITA 8 | EUR NC | GER 5 | NED 5 | HUN 4 | FRA NC | GBR 9 | BRA 13 | RSA 11 | 46 | 9th | 0 |