Many events won't let you on track with such little tread (your tires are 'dead'). I too once thought that at least dry traction would improve as the tires become bald. However, some guys on here pointed out that the heat cycling of the tire over its life leads to decreased traction by the time you get to the bald point. Perhaps someone else will chime in further.
Get new tires before your next event!
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2013 Cadillac V-Wagon, RIP Z
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