Unlike a car, the preasures on a bike are more dependant on the weight of the rider. At 18st I find 22 f and 28 r best on my 18S. Anything less and its like riding through custard.
Modern tires have more complient sidewalls & need more pressure. If you are running the old tires that the manuals are written for, they will be so stiff & hard by now, no air will be needed. Cheers, Don.
My B*A 441 had been sitting for awhile, neglected, until I got around to sorting out the starting problems. I was so excited when it started that I took it for a test ride. I thought the handling a little strange, but after all it isn't a Matchy, is it? The tire guage showed zero pressure in both of the ancient tires but they are so hard they hold to bike up even when I am sitting on it. Cheers, Don.
rightly or wrongly I run my G80cs 21" front 19" rear at at least 26 front 30 rear, do'nt like squishy tyres wobbling about all aver the place! kind regards