Tyre supplier Pirelli negotiated some mandatory tyre testing into the regulations, and will devote Friday in Jerez to wet tyre testing. The 4.4km track will be artificially-watered and wet tyres provided to teams for an exclusive test. If it rains in the previous days, of course, then the programme will be switched.
The tyre compounds are set to be a big part of the 2014 conversation again, with Pirelli adjusting the rubber for the new season. The tyres are heavier and have new construction and compounds to deal with the revised aerodynamics and power units on the cars this year. Motorsport director Paul Hembery says: "The 2014 tyres are just as different to their predecessors as the 2014 cars."
Although every lap will be important for the teams, and it will be great to get a look at the cars (and their new noses) in action, it's really the last test of the year that will be key. Mechanical gremlins and early issues can be sorted out in Spain, but we'll see more of a glimpse of what pace each team has when they get going in the desert.
All content in the series 2014 F1 pre-season testing
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References Fernando Alonso, John Booth, Kimi Räikkönen, Paul Hembery, Sebastian Vettel
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