Tyre pressures at Spa-Francorchamps
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 Spa-Francorchamps 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.
| CORNER | RUNS HOTTER BY, °C |
|---|---|
| Left front | +1.5 |
| Right front | +1.0 |
| Left rear | +2.5 |
| Right rear | +2.0 |
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.
What Spa-Francorchamps asks of a tyre
Spa-Francorchamps is the great examination: a long lap through the Ardennes with the Eau Rouge and Raidillon compression, the flat-out Kemmel straight, and fast sweeps like Pouhon that hold load for seconds at a time. Vertical compression, sustained lateral energy and long cooling straights all feature in a single lap, and Ardennes weather can change the question between sessions.
Eau Rouge compresses the car harder than anywhere in club driving; no soft setups
Pouhon's long left works the right side; compare side averages
Long straights cool the tread; probe immediately or the readings lie
Weather moves fast; recompute pressures when the ambient shifts
A 992 GT3 on Cup 2 R at Spa-Francorchamps
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 / 21.6 front, 22.6 / 22.7 rear. A different car, tyre or morning moves every number, which is what the calculator is for.
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