That's the standard 26" size for Raleigh three speed bikes like the Sport. It was one of the most common tire sizes in the sixties.
Peter Jon White Peter White Cycles 24 Hall Rd. Hillsborough, NH 03244 603 478 0900 Phone 603 478 0902 Phax http://www.PeterWhiteCycles.com
> An interesting English bike for sale uses tires that
> are 26" x 1-3/8". The seller said that this size tire
> was used on many English Lightweight bicycles of the
> 60s. I am not able to see the bike in person and would
> like to know if this is true or is this size just a
> weird tire measurement that is actually the same as a
> common 27" wheel or 700c. The picture of the bike
> looks like a standard racing bike but has nothing to
> show scale.
> Derek Willburn
> Long Beach, CA