The cars are going to look very different. The aerodynamics will be overhauled to reduce turbulence and allow drivers to follow each other more closely. They may even not have to use DRS any more: racefans.net/2019/04/02/how… #F1 #F12021
The front wing design seen on earlier images of the 2021 is expected to change, however: racefans.net/2019/09/24/f1-… #F1 #F12021
F1 says its wind tunnel and simulation tests of the new designs have produced very encouraging signs that they will be able to race much more closely than current cars: racefans.net/2019/08/22/fir… #F1 #F12021
Another key visual change on the cars is 18-inch wheels, moving away from the 13-inch wheels which have been used for decades. Pirelli has already begun testing its 18-inch rubber: racefans.net/2019/09/13/pir… #F1 #F12021
The 2021 regulations also allow for cars to feature LED panels on their wheels and body panels to display information to spectators. Here's how they could look: racefans.net/2019/09/04/whe… #F1 #F12021
Arguably an even bigger change than the redesign of the cars is the introduction of limits on (some) areas of spending. After much deliberation a $175 million 'budget cap' was agreed, though there are some significant exceptions: racefans.net/2019/06/07/det… #F1 #F12021
Drivers have voiced their concerns that F1 cars have become too heavy in recent seasons. However the minimum weight limit is expected to rise further in 2021: racefans.net/2019/07/18/we-… #F1 #F12021
There were also several changes considered for 2021 which have not gone ahead. F1 originally announced plans to change the engine format by, among other things, removing the MGU-H... racefans.net/2017/10/31/f1-… #F1 #F12021
...however with no new engine manufacturers arriving for 2021, the decision was taken to keep the current engines, with some tweaks: racefans.net/2018/11/10/why… #F1 #F12021
Making teams use more standard parts to save money has been a theme of the debate around the regulations. The FIA even issued a tender for a single gearbox supplier... racefans.net/2019/02/19/fia… #F1 #F12021
...and standard brake systems were on the agenda for 2021 at one stage as well... racefans.net/2019/05/06/ana… #F1 #F12021
Tyre warming blankets were also supposed to be banned in 2021... racefans.net/2019/06/18/pir… #F1 #F12021
...but they will stay, to the relief of some drivers, who said getting rid of them would be "extremely dangerous": racefans.net/2019/10/26/rac… #F1 #F12021
...but dropped, as was the possibility of requiring drivers to make two mandatory pit stops per race: racefans.net/2019/09/12/pla… #F1 #F12021
The reintroduction of active suspension was considered too... racefans.net/2018/05/30/act… #F1 #F12021
...however the sport's bosses were concerned it would undermine their efforts to change the aerodynamics to improve the quality of the racing: racefans.net/2019/07/19/why… #F1 #F12021
What will the effect of all these changes be on the performance of the cars? The early estimates vary widely. One team suggested it will leave F1 cars little quicker than their F2 counterparts: racefans.net/2019/09/21/new… #F1 #F12021
RaceFans will bring you all the latest from today's announcement as soon as we can. Until then, see here for more on what we know about the 2021 F1 season: racefans.net/2021-f1-season/ #F1 #F12021
