Mercedes team principal Toto Wolff said his team and Red Bull are the ones struggling the most with weight.
Both teams struggled to catch up to Ferrari through the Bahrain Grand Prix, and Wolff attributes the issue partly to their weight.
“Where we stand is that, if I make a best case, then probably Red Bull [and] ourselves are, from the top 10 cars, the most overweight.
“Then there are some who are underweight, or just above it. That’s quite a lap time advantage, or disadvantage, but [we can] be clever about it.
“Some have taken the decision to go live and are benefitting from that at the moment. I think there’s, for us, definitely room to improve, and to chip away some of the bits that we have on the car that are too heavy.”