For a Jensen 541 the 550HR16 Michelin X is recommended by Longstone Tyres.
Recommended Jensen 541 Tyres
Other Options for Jensen 541
History of the Jensen 541
Built from 1954-1959, the car had a fibreglass body mounted on a steel chassis with aluminium doors and a rear hinged bonnet that could be raised to access the engine.
Though the car initially fitted drum brakes, the later 1956 deluxe version would fit Dunlop disc brakes in both the front and rear, being the first British 4-seater to do so. It would eventually be replaced by the Jensen 541R, then 541S before the range was phased out all together to be replaced with the Jensen C-V8.