Pirelli changes wet tyre test day to Wednesday and scraps Friday wet run 29 January, 2014 Esteban Gutierrez and Kimi Raikkonen test in the wet Formula 1’s official tyre supplier Pirelli has brought forward to today (Wednesday) its wet weather tyre evaluation day following overnight rain at Jerez de la Frontera where teams have gathered for the first pre-season test.. The 2014 regulations stipulate that one of the 12 pre-season test days must be dedicated to Pirelli wet weather tyre testing. The Italian tyre manufacturer had earmarked Friday at Jerez for this purpose, however damp conditions over southern Spain prompted Pirelli to alter the test day. Jenson Button drives the McLaren MP4-29 Ahead of the second day’s running, extra water was sprayed across the track to ensure the surface stays damp enough to properly evaluate the new Pirelli Wet tyres, which feature an all new tread pattern and a different compound for 2014. Aside from running Wet tyres, teams are free to continue their own testing programmes in parallel throughout the day. After missing the first day, Jenson Button was the first out on track in the McLaren MP4-29. But there was no sign of Marussia, Caterham or Toro Rosso before lunch on day two. (GP247) Subbed by AJN.