Over the weekend I acquired an '83 ST500 in all original spec down to the bar tape. With 650a 26 X 1-3/8 wheels and tires... Perusing through the catalog on vintagecannondale I don't see this specification. Can anyone shed some light on this?

Smallest size listed in catalog is 19" with a 40.9" wheelbase and 18" chain stays

ST C2C: 18-1/4"
WB: 41" -ish
CS: 18" -ish
Stand over: 27.5" -ish