London — Formula One has undergone major rule changes, with wider cars and fatter tyres providing a new look and bigger challenge. The following looks at what differences fans will see when the championship starts in Australia on March 26. Lap times: Cars are expected to lap between three and five seconds faster due to revised aerodynamics and the tyre changes. The fastest lap in Barcelona testing was quicker than any pole position there since 2007. The gain is coming through the corners, with many taken flat out thanks to improved downforce and grip. That means higher G-forces on drivers. Straight-line speeds will be slower but drivers can stay on the throttle for longer. "It’s quite unreal. It’s amazing. I’m coming through some of these corners ... and I’m like a kid on a roller-coaster ride because it’s so much better than it was before," says Mercedes’ triple world champion Lewis Hamilton. Tyres: Tyres are fatter. The width of the rears has expanded from 325mm to 405. The fronts...

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