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Dunlop K81 TT100 . Not the Jap NYLON ones . in case it rains . Rubber , were even made in Ireland , also .
theser a bit obsolette . Like the Motorcycle . 
4.10 front & 4.25 rear'd be a bit overdone , but if continental touring , better . AND increase ground clearance over 3.60 & 4.10 .
If its a 18 rear no way id use a 4.10 , if both are 19s , 3.60 & 4.10 F & R .
Were American made ' R ' K81s ( Race ) for rear of goldwings @ 100 in Death Valley . Have reasonable durability with the Race Casing .
Likely some moden things'd suit , though ' wide oval ' like original Road Runners give better cornering clearance .
Other options the 4.70 18 yokohama Knobbly , Enduro / green Lane & drifting the bends on Tarmac . :twisted: