Alvis - Alvis10/30,11/40 & 12/40
Alvis started in 1920 with its 10/30 model, a 4 cylinder 65x100mm sidevalve, followed with an option the following year with the 11/40, 68x110mm which was replaced the year after (1923) by the almost identical 12/40 that was in production to 1924. All these models were the precursor to the 12/50.
Alvis tyre size for their 10/30, 11/40 and 12/40 models was 760x90 beaded edge, and Blockley produces the perfect example - see full details at the link below: