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Unless the tire rules have changed, I'd expect the Audi R18 and the Peugeot 90x to use the same (or at least similar) wheels and tires to what the R15 and the 908 use: both use 13' tires up front and 14.5' at the rear, and both use 13.5x18 front wheels and 14.5x18 rears.
In otherwords, the new LMP1s will basically be sort of like LMP2s with LMP1 wheels and tires.
For the wide front tires, you'll need a lot of weight up front or a lot of front downforce to prevent what happened with the ARX-02--it took an eternity for it's front tires to got up to full temperatue, and until then, the car likely had dreadful understeer due to a lack of front grip. On the long run, the car was good because of excellent grip once the tires were hot and had very good tire wear, but the Audi R15 and Peugeot 908 triple- and quadruple stinted tires at LM this year without issue.
However, I do feel that tire/wheel widths will likely be within a inch or so of what the rears are, but that's also the current status quo.
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