Listen to this article The limit for car plus driver increased from 752 to 795kgs for this season in order to reflect both the change to 18-inch wheels and the introduction of new safety features. However, despite the increase, teams still found it hard to get down to that limit. One unexpected factor has been the need to beef up ground effect floors which in early testing proved more vulnerable to damage and flexing than their predecessors. Speaking in Bahrain on Thursday, F1 managing director Ross Brawn acknowledged that the teams faced a difficult task. “What became clear is meeting the weight limit is going to be pretty challenging with these cars,” he told F1 TV. “There’s a lot of new safety initiatives after the terrible accident in Spa a couple of years ago in F2, and the accident with [Romain] Grosjean, and one or two other things. So the weight limit, or the weight of the cars, in …