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Ginetta G40 Wheels, Tyres & Brakes Spec

The GRDC car uses 17" wheels manufactured by Rimstock / Team Dynamics exclusively for Ginetta. For the GRDC race series, the regulation tyres are Michelin Pilot Sport 3. For GRDC+ / G40 Cup, the regulation tyres are Avon ZZR (and Michelin PS3 for wets).

  • Rim size: 17" x 7.5"
  • Tyre size Michelin PS3: 205/40 17
  • Tyre size Avon ZZR: 215/40 17

The Michelin tyres last at least one season of track days and racing. Compared to performance cars like the Porsche 911 when used on track, this is remarkable value for money. A 911, for example, at 1600 kilos and 350 BHP, will probably use a £900 set of tyres in three track days.

The Avons are road-legal semi-slicks and much grippier on the circuit, if it's dry.


Brake discs / rotors are 280x25mm all round. Front brake calipers are four pot, rear brake calipers are two pot, both manufactured by Hi Spec Motorsport of Dartford exclusively for Ginetta. The handbrake works on the rear discs with a separate, cable-operated caliper.

The recommended brake fluid is Sunoco R600+. Rear brake bleed screws (8 mm head) tend to seize up, so be aware of over-tightening, and check regularly.

There is no anti-lock braking system on the G40.