Sauber's C33 has undergone an "extensive weight reduction" ahead of next weekend's Spanish Grand Prix.
Sauber is one of four outfits that have yet to get off the mark this season as the team has been hampered by an overweight car.
Although this year's minimum weight was increased to 690kgs, the C33 failed to come close to that costing the team valuable time.
As such, Sauber worked on new lighter parts during the break between China and Spain with Giampaolo Dall'Ara revealing they had achieved their aim.
Sauber's head of track engineering said: "At the Spanish Grand Prix both C33s will have essential revisions, following an extensive weight reduction and a significant...
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