I an currently restoring a Gitane TdF for my wife. It probably dates from the 70's and is in pretty good condition. It sat for years in the window of a closed bike shop which faded the paint and destroyed the tires. It has Mavic tubular rims which has no size markings. The tires are only marked with the weight of 270 grams. The rim measures 25 inches in diameter and 20mm wide. I have searched through the mish-mash if information on the web and am more confused now than when I started. What size tubular tires will fit these rims? Any help on this matter will be greatly appreciated.
By the way I ride a Schwinn World Voyager which I bought new.