Charles Pic reckons Formula 1 won't find it easy swapping from 13-inch to 18-inch tyres should the move go-ahead.
The Lotus driver completed 14 laps on the Pirelli 18-inch tyres during Wednesday's in-season test at Silverstone.
Asked how he felt about the tyres, Pic told Autosport: "If we go with this type of tyre one day, it will be a big challenge.
"For the teams, because they will have to build a completely new car around it because the philosophy is completely different, and also for the drivers because they are completely different.
"And on the looks side, it is different and some people will like it, others not.
"Honestly, I thought they were a bit too big, but...
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