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CIRCUIT SHEET · USA

Tyre pressures at Sebring International

Track outline (c) OpenStreetMap contributors, ODbL

The lap, to scale. Track outline © OpenStreetMap contributors (ODbL).

How hard a circuit works each corner of the car shows up as tread temperature, and temperature is what sets pressure. GripCalc carries corner heating figures for Sebring International as a starting point: how much hotter each tyre runs over the session's base temperature, from the layout's mix of corners and load. They pre-fill the calculator when you pick the circuit, and your own pyrometer readings refine them from the first session.

CORNERRUNS HOTTER BY, °C
Left front+2.0
Right front+1.5
Left rear+3.0
Right rear+2.5

ESTIMATED — class-based starting values over an 85°C session base, derived from this layout's type (direction, speed profile, load), and shared with circuits of similar character rather than measured here. Not gospel: enter your own pyrometer figures after a session and they take precedence.

FROM THE TYRE'S SEAT

What Sebring International asks of a tyre

Sebring is the roughest famous surface in this database: much of the lap runs on original airfield concrete whose bumps and seams hammer the car and cycle tyre loads constantly. It is a test of compliance as much as grip, and pressures that are too high skip and scrub across the concrete instead of gripping it.

W1 Watch

Bumps punish overinflation; err conservative and verify with the probe

W2 Watch

Concrete sections read different temperatures to the asphalt ones; note where you probe

W3 Watch

The hairpin and Sunset Bend work opposite ends of the car; check both splits

WORKED EXAMPLE · COMPUTED BY THE ENGINE

A 992 GT3 on Cup 2 R at Sebring International

Published hot target 30.5 / 32.0 psi at 92°C tread, on a 15°C morning, with the corner figures above: cold set 21.5 / 21.5 front, 22.6 / 22.6 rear. A different car, tyre or morning moves every number, which is what the calculator is for.

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