I thought it was this...
Quote:
- Maximum wheel diameter increased to 640mm front and 710mm rear, with maximum widths of 365mm front and 460mm rear (Article 12.4) with slick tyres.
Reason: To increase “mechanical” grip to compensate for reduced aerodynamic downforce to facilitate overtaking.
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EDIT: This post doesn't make much sense... what I was trying to point out is that every reg is part of a balancing act to force F1 cars down a path that makes sense to the governing body. Taken in isolation, each one may seem a bit strange.