Tyres

8 changes, oldest first.

1971 introduced

Slick tyres

Treadless dry-weather tyres appeared in 1971 and were standard within a year. Source

1993 changed

Narrower tyres and smaller rear wings

Tyre width was cut to 15 inches and rear wings lowered and narrowed to trim speeds; the field was limited to 26 cars. Source

1998 introduced

Grooved tyres and narrower cars

Cars were narrowed from 2.0 m to 1.8 m and slicks were replaced by grooved dry tyres (three grooves front, four rear). Source

1999 changed

Four grooves on all tyres; wheel tethers

Front tyres gained a fourth groove, and wheels had to be tethered to the chassis to stop them flying off in crashes. Source

2005 changed

No tyre changes during the race

One set of tyres had to last qualifying and the race (bar damage or rain). The rule lasted one season and was abandoned after the 2005 United States Grand Prix affair. Source

2007 changed

Single tyre supplier (Bridgestone)

Michelin left, leaving one supplier, and drivers had to use both dry compounds during a race. Engine development was frozen. Source

2011 changed

Pirelli becomes sole tyre supplier

Pirelli replaced Bridgestone with tyres designed to degrade quickly; the 107% rule returned. Source

2016 changed

Three dry compounds per weekend, teams choose sets

Pirelli nominated three compounds and teams picked their allocation; radio coaching restrictions were introduced and later relaxed. Source