1973 Norton Commando 750 rear tire

Tornado said:

Definately 120-19 and Avon RR.but unsure if /90 from my recall. Looks quite cubby compared to front. Uusure of age. Ill try to frap a pic of it next time i see it....heres a shot from a test ride two days ago...can see the heft compared to front...View attachment 120976

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Looks like an 18 to me…

Thought I post this here being it's regarding a 72 Commando rear tire. Looking for advice.

just had a WM3 18" rear wheel laced and looking for a rear tire appropriate to match my current 100/90-19 Avon Road Rider? Was hoping to get a 4X18 Road Rider but I understand they have been discontinued. Is my next best option (for an Avon) be a 120/90-18 which is a front/rear if I can find one? Will a 120/90-18 have enough clearance for the chaingaurd?