F1's heavier drivers are worried about the introduction of KERS technology next year.

Mark Webber, who is 185 centimetres tall, revealed this week that fellow drivers who weigh more than about 70 kilograms may be penalised in 2009.

The introduction of heavy KERS systems, but no increase in the minimum weight of formula one cars, means that smaller and lighter drivers will be better able to play with the positioning of extra ballast.

BMW-Sauber's Robert Kubica is also 185cm tall, and last winter embarked on a drastic diet in order to get closer to the weight of his diminutive teammate Nick Heidfeld.

But he still tips the scales above 70kg, and told F1's official website that KERS is "a concern for all the 'heavy' drivers like me."

Source. GMM