Mercedes Benz SL55

My Car Uses Front Tires 245/40 R18 And Rear 265/35 R18, Can I Upgrade To Front 255/40 R18 And Rear 285/35 R18 With The Same Rims?? I Am Not...

I Went And Had My Car Inspected For The State Safety Sticker And Failed As The Parking Brake Release Was Not Working. I Have Not Used It In...