Renault R25
- Constructor
- renault
- Years
- 2005–2005
- Designers
- Bob Bell, Pat Symonds, James Allison, Tim Densham, Dino Toso
- Engine
- Renault RS25 V10
- Configuration
- 72-degree V10, 2998 cc, naturally aspirated
- Power
- 850 bhp (800-900 bhp at 19,000 rpm)
- Chassis
- carbon-fibre monocoque
- Gearbox
- Renault 6-speed sequential semi-automatic
- Suspension
- Pushrod-activated torsion bars front and rear, plus a tuned mass damper in the nose from late 2005
- Brakes
- carbon disc
- Weight
- 605 kg
- Wheelbase
- 3100 mm
- Tyres
- Michelin
- Races
- 19
- Wins
- 8
- Poles
- 7
- Drivers' titles
- 1
- Constructors' titles
- 1
- Specification confidence
- high
A well-balanced car on Michelins, plus a weight on a spring in the nose to stop the front tyres skipping over bumps
The tuned mass damper: a sprung mass in the nose oscillating out of phase with the front suspension, keeping the tyres in contact with the road
The mass damper was worth about three tenths of a second and was completely legal until the FIA decided in 2006 that a mass that is not rigidly attached counts as a movable aerodynamic device. Renault won the 2005 titles and broke a run of five consecutive Ferrari championships doing it.
19 races, 8 wins, 7 poles. Alonso's first title, at 24 the youngest champion to that point, and Renault's first constructors' championship.