Tire Width for traction

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I can't answer your question exactly, but my BEST EVER on a 16X7 wheel with a 245-50-16 nitto DR was a 1.70, but normally it was in the mid 1.7's. On my 17X10.5 wheels with 315-35-17 nitto DR's I managed a best ever of 1.66 60' and just about all my runs were in the 1.6's, so I'd say the tire contact area helped.