A few years ago I got a copy of the book,
"GREAT BRITISH MOTORCYCLES of the 1950s & 1960s" by Bob Currie.
It is basically a bunch of reprints of the motorcycle reviews published in
THE MOTOR CYCLE .
In the information in each review it lists the tire sizes for each motorcycle and I thought it might be interesting to make a list of what it shows. The list is in the same order as the articles in the book and I added the engine size (rounded off) for reference. f = front, r = rear
It starts off with the Vincent Black Shadow, one of the largest and fastest of the British motorcycles.
Using modern logic, that beast should have massive tires on it but it doesn't. Curious.
1949 VINCENT BLACK SHADOW--1000cc, 3.00 X 20 f, 3.50 X 19 r
1950 ROYAL ENFIELD BULLET--350cc, 3.25 X 19 f, r
1950 ROYAL ENFIELD TWIN--500cc, 3.25 x 19 f, r
1951 ARIEL RED HUNTER--500cc, 3.00 X 20 f, 3.25 X 19 r
1952 BSA STAR TWIN--500cc, 3.25 X 19 f, 3.50 X 19 r
1952 TRIUMPH TIGER 100--500cc, 3.25 X 19 f, 3.50 X 19 r
1956 BSA B31--350cc, 3.25 X 19 f, r
1953 ARIEL SQUARE FOUR--1000cc, 3.25 X 19 f, 4.00 X 18 r
1954 VELOCETTE MSS--500cc, 3.25 X 19 f, r
1956 TRIUMPH TIGER 110--650cc, 3.25 X 19 f, 3.50 X 19 r
1957 TRIUMPH TIGER CUB--200cc, 3.25 X 16 f, r
1958 NORTON MODEL 99--600cc, 3.00 X 19 f, 3.50 X 19 r
1961 MATCHLESS G12--650cc, 3.25 X 19 f, 3.50 X 19 r
1961 ROYAL ENFIELD CONSTELLATION--700cc, 3.25 X 19 f, 3.50 X 19 r
1962 NORTON DOMINATOR 650SS--650cc, 3.00 X 19 f, 3.50 X 19 r
1962 AJS MODEL 18--500cc, 3.25 X 19 f, 3.50 X 19 r
1962 BSA ROCKET GOLD STAR--650cc, 3.25 X 19 f, 3.50 X 19 r
1964 TRIUMPH BONNEVILLE--650cc, 3.25 X 19 f, 3.50 X 18 r
1966 ROYAL ENFIELD CONTINENTAL GT--250cc, 3.00 X 18 f, 3.25 X 17 r
1967 BSA B44 VICTOR--441cc, 3.25 X 18 f, 3.50 X 18 r
Based on these sizes, it looks like my 2011 ROYAL ENFIELD DELUXE is right where it should be when it comes to its tires.