My expectation is that on the track, it would possibly have been raced on 700C tubs and used 590 wired-ons on the road. Tubs were available in all sorts of sizes for a while e.g. Constrictor
http://www.users.globalnet.co.uk/~pattle/ddgcs/tyres2.htm
Some tubulars are still available in a range of rim sizes e.g. Vittoria Juniores
https://www.vittoria.com/ww/en/tyres/road-tires/juniores
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My expectation is that on the track, it would possibly have been raced on 700C tubs and used 590 wired-ons on the road. Tubs were available in all sorts of sizes for a while e.g. Constrictor
http://www.users.globalnet.co.uk/~pattle/ddgcs/tyres2.htm
Some tubulars are still available in a range of rim sizes e.g. Vittoria Juniores
https://www.vittoria.com/ww/en/tyres/road-tires/juniores