Balanced clay substrate — typical Midwest dirt; groove moves out as rubber builds.
Old Stateline Speedway is a 1/5-mile kart track in Lawsonville, NC. Three things decide your night: density altitude (how much the air feeds the motor — shown live above), seat and lead placement, and tire pressure as the surface comes in.
As temperature, humidity and barometric pressure shift across a race night near Lawsonville, the density altitude above moves with them — and your tune should follow. Most weather apps show sea-level-corrected pressure, which gives the wrong DA; racer.wiki uses uncorrected station pressure for the real number. Read the full density altitude guide →
As the track at Old Stateline Speedway rubbers in and the air changes through the day, grip and the right tire pressure move with it. How to read the track → · Why DA matters →
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