The teams had their first impression of Pirelli's latest tyres this week, at the opening official test of the year at Jerez. The tight and twisty 2.751 mile (4.428 km) Spanish track tested most aspects of Pirelli's new range of tyres, allowing the teams to learn about the basic characteristics of the latest-generation compounds over four days and form a positive first impression. The teams now move to Barcelona for the next official test from February 19-22.

Paul Hembery: "The four days spent at Jerez, with most teams running their new cars, gave us all a good general impression of the characteristics of our 2013 tyres on track, with completely new compounds and construction. It seems that we are very much on the right road and the changes we wanted to see are all there: the tyres are faster than their equivalents last year, and they have a wider window of peak performance. Conditions at Jerez were not ideal this year however, as it was an extremely abrasive track - the most abrasive of all the circuits we visit all year - and consequently it was hard to draw any proper conclusions, given that the surface had actually become even more abrasive than last season. We came away with plenty of data for the hard and medium tyres, very little for the soft tyre and none for the supersoft. Now we look forward to the next two test sessions at Barcelona, which will provide another very valuable opportunity for the teams to extend their knowledge of this year's tyres."

Testing Facts:

The teams are allocated 100 sets of tyres per car per year for testing purposes. The teams concentrated on working their way through the different compounds, in order to get an initial read about how the latest generation of deliberately fast-wearing tyres from Pirelli interacted with their new cars, both when new and used. Pirelli brought a total of 35 sets per car to this test (20 chosen by Pirelli, 15 by each team).

Ambient and track temperatures were cool, in the region of 15 degrees centigrade average most days, which led to a risk of graining. This occurs when a tyre slides if it is not up to temperature, and the friction against the track surface creates a wave-like pattern of wear, known as graining. This was mostly noted in the very cool conditions of the morning - sometimes with temperatures of less than five degrees centigrade - and accentuated by the abrasive surface.

With the conditions and track layout at Jerez not really typical of anywhere else this year, the time difference between the compounds is not expected to be completely representative of the rest of the season.

Most laps: Gutierrez -(252), Di Resta (240) and Massa (227).

Some teams were able to run up to 430 miles (700 kms) per day: the equivalent of more than two grand prix distances.

None of the intermediate or wet tyres were used to set a lap time, as conditions remained completely dry throughout all four days.

As well as evaluating cars and tyres, teams also carried out pit stop practice.

The orange marking for the hard tyre was seen for the first time, replacing last year's silver.

The technical layout of Jerez with its slow corners placed heavy demands in terms of traction: particularly on the rear tyres.

The high macro-roughness of the track at Jerez is caused by a lack of bitumen in the asphalt, leading to a relatively open surface, which creates the abrasion.

Testing numbers:

Total number of sets brought to Jerez: 385 sets which equals 1540 tyres

of which supersoft tyres: 7 sets
of which soft tyres: 49 sets
of which medium tyres: 157 sets
of which hard tyres: 95 sets
of which intermediate tyres: 42 sets
of which wet tyres: 35 sets

Total amount of sets used: 251

of which supersoft tyres: 3 sets
of which soft tyres: 33 sets
of which medium tyres: 137 sets
of which hard tyres: 74 sets
of which intermediate tyres: 3 sets
of which wet tyres: 1 set

Longest run: