I err...... guess the article was about Velocettes.....
Date Capacity Make of Motorcycle Grand Prix & circuit Average Speed
1924 600cc New Imperial (980cc)[17] Ulster Grand Prix, Clady Circuit, Dundrod, Northern Ireland 72.71mph
1925 600cc New Imperial (980cc) Ulster Grand Prix 65.26mph
1927 500cc Norton Swiss Grand Prix, Circuit de Meyrin, Genève
1927 500cc Norton Belgium Grand Prix, Circuit of Spa-Francorchamps
1928 500cc Norton Grand-Prix de L'U.M.F, Bordeaux, France
1930 500cc Norton Ulster Grand Prix 80.56mph
1930 500cc Norton Grand-Prix de L'U.M.F, Pau, France
1931 500cc Norton German Grand Prix, Nürburgring
1931 500cc Norton Belgium Grand Prix
1931 500cc Norton Swiss Grand Prix, Bremgarten, Bern
1931 500cc Norton Ulster Grand Prix 86.43mph
1932 500cc Norton Grand-Prix de L'U.M.F, Circuit of Rheims, France
1932 500cc Norton Belgium Grand Prix
1932 350cc Norton Swiss Grand Prix
1932 500cc Norton Swiss Grand Prix
1932 500cc Norton Ulster Grand Prix 85.15mph
1933 500cc Norton Swiss Grand Prix
1933 500cc Norton Ulster Grand Prix 87.43mph
1935 500cc Husqvarna Swedish Grand Prix, Saxtorp
1939 350cc Velocette Ulster Grand Prix 91.65mph
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