3′ 9″ diam., disc. 4½″ apparent tread.
Hub 12½″ face dia., 1″ out from the tyre.

Source: B1 tender measured direct at Loughborough in 1995.

Casting: 142.9 mm tread dia., 111.3 i/d. Hub 3.2 mm out from the tyre.

7¼″ gauge price list . Stock