Motorway running and pressure
Updated 2026-09-18
A long run at 70 mph (or 130 km/h on the Continent) puts heat into the carcass. The gauge will be up when you stop at the services. That is normal. Set cold at home; do not “correct” at Warwick services.
Under-inflation on a motorway is how shoulders separate. If TPMS nags at speed, come off, cool, then measure. Driving on a lamp because “we’re nearly there” is how you buy four tyres and a wheel.
High-speed-rated tyres still want the vehicle number. The Y on the flank is not an invitation to add 5 psi.
Roof boxes add drag and a little rear load. They do not usually get their own pressure table. Stay on the placard and respect speed limits for the box.
Check again the morning after a long trip. A nail picked up in France may only show once the tyre has cooled in Dover.