Formula One tyre suppliers Pirelli have confirmed the tyre compounds that they will take to Japan and Russia.
The Italian company will bring the two hardest compounds in their range to Suzuka - the orange-marked hard and white-marked medium - in order to cope with the high speeds, fast corners and abrasiveness of the Japanese circuit.
The choice for the brand-new Sochi circuit in Russia was much more complex, as there has not yet been any representative running on the track.
However, using simulation data, Pirelli engineers have calculated that the most suitable compounds to take are the white-marked mediums and yellow-marked softs as this combination is capable of covering a wide range of conditions.
The choices for the final three races of the year will be announced after the 2014 Formula 1 Russian Grand Prix.
At a glance - tyre compounds for 2014:
Australia - soft, medium
Malaysia - medium, hard
Bahrain - soft, medium
China - soft, medium
Spain - medium, hard
Monaco - supersoft, soft
Canada - supersoft, soft
Austria - supersoft, soft
Great Britain - medium, hard
Germany - supersoft, soft
Hungary - soft, medium
Belgium - soft, medium
Italy - medium, hard
Singapore - supersoft, soft
Japan - medium, hard
Russia - soft, medium
(source: f1.com)