I found an old Moulton folding bicycle in the back of my sisters garage. Although very tatty looking, I pumped the tyres up, oiled the chain, and rode it down the street. The tyres are split and perished, and will not last long. They are an odd size, 14 X 1 3/8. Such tyres are available on ebay, "Raleigh" Brand. The question is, is there a difference between 14 inch tyres made for a childs bike, and 14 inch tyres for a small wheel adult bike ? The recomended pressure for Moulton Bikes is 75 PSI.