I got recommendations from Wheel House Tyres for the Avon AM 26 tyres. They were 28psi solo and 30-32 psi two up. I generally regard 26psi as the absolute maximum pressure for an Ariel on AM26 tyres. More than that and I find it hops about the road like a rabbit on steroids, whether rigid or swinging arm. Perhaps that is a reflection of the fact that modern bikes tend to be a lot heavier than Ariels - or it may simply be a reflection on my riding style.
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.