RACE DEBRIEF

    The winter break has flown by, and just three months since the last race of 2020, pre-season testing gets under way on Friday. So with that exciting realisation, here are 10 crucial things to keep an eye out for when you're watching F1 testing on F1 TV, or following it on F1.com with our live commentary and up to date news...

    1. A very tight schedule

    Just three days of testing await the teams this year, compared to a whopping six – spread over two weeks – in 2020, which was down from eight in prior years. And the teams are only allowed one car on track at any one time, meaning the drivers will have to play nicely and share the three days between them, with Williams giving a day to test driver Roy Nissany, too.

    READ MORE: Everything you need to know about 2021 pre-season testing

    As a result, we could see much busier run plans and fewer lulls in the on-track action. It also means that any spins or crashes will set teams back even more than in previous years, so the drivers will have to be on best behaviour to avoid any prangs, to ensure the teams can maximise their running.

    2. A change of venue

    In recent years, the Circuit de Barcelona-Catalunya has hosted pre-season testing, but this year Bahrain has stepped in, and the hotter climate will make a significant difference.

    The warm weather should make it easier to switch on the tyres, and allow the teams to properly assess the new Pirellis, as well as giving the engineers better data on their cooling packages.

    Crucially, as the first race is also at the Bahrain International Circuit, teams will be able to tailor their testing for the season-opener. However, they will need to pack carefully as Bahrain is much further away from the teams' headquarters than Barcelona, so they won't be able to fly out any spares at a couple of hours' notice, should a driver get a bit too close to a barrier, or a new part not work as expected.

    READ MORE: 5 ways testing in Bahrain will be different to Barcelona

    Bahrain: Lando Norris's Bahrain International Circuit guide

    3. First sight of some of the new cars

    A busy launch period before pre-season testing saw most teams unveil their new liveries for 2021 through the medium of computer-generated renders, but now we’ll see the 2021 grid in all its glory.

    Haas have an official car unveiling planned for the morning of Day 1 (March 12) while the likes of Williams, Red Bull and Alpine will have their cars on track in full public view for the first time. Which brings us onto our next point…

    4. Just what have Mercedes and Red Bull been hiding?

    The Silver Arrows were somewhat coy at their launch, admitting that the car we were shown was not the final specification due to hit the track – especially the floor. So just what do they have up their sleeves on the W12? Last season we saw the ingenious DAS system make its debut at testing, and while that’s outlawed for 2021, will we see another jaw-dropping gizmo from the reigning champions?

    RAPID REACTION: Mercedes show off new W12 car – but what are they hiding, and why?

    Red Bull have been even more secretive. They released renders of their new car, and then completed a shakedown of it at Silverstone – but did not reveal a single picture of the RB16B, instead releasing images of their drivers and key team personnel posing behind an older model. Has their famed design genius Adrian Newey come up with something really special as Red Bull aim to finally topple Mercedes in the fight for the championship? We should soon find out...

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    This render is as close as we've got to seeing the 2021 Red Bull RB16B

    5. How much have the new aero rules slowed the cars?

    The major change to the regulations this season is a reduction in downforce, as the cars’ floors have been trimmed from their rectangular shape to a tapered one. The decision was taken to cut downforce in order to reduce the load on Pirelli’s new tyres, which will be tested throughout this season, including a session after testing.

    Cuts to rear brake duct winglets and diffusers also come into force this season, so teams have estimated a loss of 0.5s per lap – though they’ll be working hard to claw that deficit back.

    Will the cut in downforce make cars skittish, and should we be prepared for copious amounts of opposite-lock at Bahrain, especially at the tricky Turns 5-7 complex? Perhaps not, but either way, we should see what effect the regs tweak has had on lap times, and which teams have dealt with the downforce cuts the best.

    Archive number: M256845
    Mercedes' helpful guide to the area of the floor being cut for 2021, to reduce downforce. Mercedes, however, haven't revealed their new floor just yet...

    6. Have Ferrari clawed back some pace over the winter?

    The Scuderia – who only revealed their 2021 livery on Wednesday – will be on a mission to redeem themselves this season having finished a lowly sixth in 2020. Their pace in last year’s pre-season testing was a source of worry for the tifosi, when they showed a significant loss of pace on the straights, while team boss Mattia Binotto had to insist there was no sandbagging at play.

    Fans' fears were duly confirmed soon after as Ferrari couldn't keep up with their midfield rivals once racing got under way last season. But with a new-spec Ferrari engine for 2021, plus significant aero development, we’ll have to see if they’ve clawed their way back towards the front of the grid with the SF21.

    READ MORE: Two-tone red, a splash of green, and clear targets – 5 takeaways from Ferrari’s SF21 launch

    7. New power units

    Ferrari aren't the only manufacturer with an all-new engine for 2021 – Honda too have a new unit, the Japanese firm having brought forward the spec they intially planned for 2022, to run in the Red Bull and AlphaTauri cars this year, as they go all out for championship success in Honda's last season in the sport.

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    Have Honda got something special up their sleeve for their power unit?

    Meanwhile McLaren are the only team to have switched engine supplier over the winter having swapped Renault for Mercedes, so they will be keen to ensure they don't suffer any unexpected teething troubles when they start racking up the miles in their papaya-coloured MCL35M - though eagle-eyed observers will be watching the speed traps closely to see if the switch to Mercedes-power has given them a speed boost.

    8. Alonso's return

    This season heralds the return of two-time World Champion Fernando Alonso to Formula 1 after two years out of the sport, but it's been a somewhat rocky road back for the Spaniard. Having been injured in a cycling accident, he missed the virtual launch of the Alpine A521 and also missed the team's shakedown at Silverstone on March 4, with Esteban Ocon taking the driving duties.

    As a result, testing will be his first outing in the rebranded team's new A521, and a crucial day-and-a-half's running for the veteran as he looks to get back up to speed before the season begins in earnest. He's not due to be behind the wheel until Day 2, though, so we will have to wait to see the former Renault, McLaren and Ferrari man out on track.

    Fernando-Alonso-1.jpg
    We'll see Fernando Alonso in Alpine colours for the first time, this weekend. But how will he fare?

    9. The three rookies – and one very famous name

    Not only will there be four World Champions in F1 this season, but three rookies will also take to the grid: AlphaTauri's Yuki Tsunoda and Haas pair Mick Schumacher and Nikita Mazepin. Tsunoda has had the luxury of a shakedown with his team at Imola, while Mazepin has done likewise in the VF-21.

    Schumacher has not yet had a chance to drive the car, and though all three new boys will be a source of intrigue, all eyes will surely be on the young German, who is joining the F1 grid 30 years after his father Michael's Grand Prix debut.

    READ MORE: 30-year anniversary of father's debut makes my own more emotional, says Mick Schumacher

    Mick-2-664.jpg
    Mick Schumacher is bringing his famous surname back to F1

    10. New driver line-ups at McLaren, Red Bull, Ferrari and Aston Martin

    After a dramatic flurry of driver activity in 2020, it might be easy to forget who has landed where. So here's a small refresher: Daniel Ricciardo has joined McLaren; Carlos Sainz dons red at Ferrari; Sergio Perez takes the reins in place of Alex Albon at Red Bull; and four-time champion Sebastian Vettel partners Lance Stroll at Aston Martin – that's in addition to Alonso joining Alpine, Tsunoda coming in at AlphaTauri, and the all-rookie pairing of Mazepin and Schumacher at Haas.

    So who will hit the ground running with their new team? And will anyone struggle to impress their new employers? We'll soon find out...

    Make sure to watch testing coverage in full, plus analysis, using F1 TV – or watch live with your local broadcaster. Find out more about the revamped F1 TV service here, or where to watch pre-season testing in your territory here. And don't forget we'll have full coverage right here on F1.com.