per advice on this forum I have just replaced the Speedmasters w/ Avon AM 26 frt and rear in std size, Forum advice has been 25# frt and rear. An old hand here has Michelein Macadams on his Knight and found 32 -33 best a/c the modern designs have softer sidewalls etc. That would be way too hard on the old tires and the dreaded head shake fear arises. Any thoughts appreciated. Riding an unrestored but upgraded (VOC brakes etc) D Shadow w/ hydraulic steering damper (thanks to Russel Kemp). Mike Whitney