The Toleman TG185 was a Formula One racing car designed by Rory Byrne and was used by Toleman Motorsport during the majority 1985 Formula One season. The car was powered by the 800 bhp (597 kW; 811 PS) Hart 415T Straight 4 turbocharged engine. The car was late in arriving for the 1985 season for no other reason than a lack of tyres. In 1984 Toleman started the season using tyres supplied by Italian company Pirelli. Part way through the season though the team pulled out of their tyre contract with Pirelli and started using the French Michelins instead. However, when Michelin pulled out of F1 at the end of 1984, the team were unable to come to an agreement to use Goodyear rubber. They were also unable to get a deal with Pirelli who were reluctant to supply tyres for the team. It was only after team sponsor Benetton bought Spirit Racing and transferred their Pirelli contract to Toleman that the team were able to run in 1985.

The car was fundamentally unchanged from the TG184 apart from a revised suspension to deal with running different rubber and revised rear bodywork. The car was initially driven by former Brabham driver Teo Fabi of Italy. He was joined in the team from the 10th race (Austria) by fellow Italian Piercarlo Ghinzani. Fabi gave the Toleman Team its first and only pole position when he qualified on pole for the German Grand Prix held at the new Nürburgring circuit. Fabi set his time in the Friday qualifying session and as it rained on the Saturday no one else could beat his time. Unfortunately he got a bad start in the race due to a slipping clutch and was only 10th going into the first corner. The clutch would be the cause of the car's retirement from the race on lap 29.

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