Naturally, the biggest challenge of the winter period has focused on how best to handle the bigger, heavier wheels and tyres. The rears, for example, are a whopping 80mm wider and weigh 1.8kg more each, while the fronts are 60mm wider and around 0.8kg heavier apiece. While the weight increase isn't such a big deal on its own, combining that with a significant increase in size is far from straightforward - particularly when it comes to manoeuvring the tyres for pit stops. The tyre stacks themselves are now taller too, thanks to the increased depth of the wheels. Over the course of a race weekend, all that extra bulk and weight starts to add up.