Bob & Chet Primmer of Corona Del Mar with their 1948 Triumph Grand Prix
Make: Triumph
Model: Grand Prix
Year: 1948
Country of Origin: England
Engine: 500cc Twin
Transmission: 4 Speed
Owner: Bob Primmer
City: Corona Del Mar
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Congratulations to Bob Primmer of Corona Del Mar for winning Bike of the Month with his 1948 Triumph Grand Prix.
Bob won a plaque provided by Russ Brown Motorcycle Attorneys.
Bob and Chet always bring something nice from their family collection and today was no exception.
Per Bob & Chet:
1948 Triumph Grand Prix
Triumph very rarely supported racing in its history, but there were exceptions, such as the rare Grand Prix model. Triumph supplied thousands of portable generators to the military during World War II, this bike uses an engine of the same design.
Triumph’s first aluminum cylinder and head.
Ernie Lyons proceeded to win the inaugural postwar Manx Grand Prix in 1946 on one of these machines. Triumph built a limited number
Cataloged as the Grand Prix model, which had racing camshafts, twin Amal TT carburetors, a ported cylinder head, lightened and polished valve gear, a polished crankshaft running on roller bearings and heavy-duty connecting rods.
It’s thought between 150 and 200 Triumph Grand Prix were delivered between 1948-50, and all were very special machines, each hand-tuned by the factory experimental department. A few, perhaps 25, were built up for the U.S. to race in AMA Class C racing, which allowed only cataloged production machines to race, limited to 500cc for OHV motors.
They have won Bike of the Month four times in the past:
March 2025 1936 Velocette KSS 500cc Custom
January 2025 1954 Simplex Servi-Cycle
September 2024 1938 Zundapp K800
August 2024 1941 BWW R12
Thank you, Bob for bringing your Triumph out for all of us to see. See all the photos in our August 2026 Gallery.
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