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Established in 1901, Belsize Motors was based in Clayton, Manchester, England. The company was founded by Marshall & Company and took its name from their Belsize works where they had built bicycles.

The first cars were actually made in 1897 but were called Marshalls and were very similar to the French Hurtu, itself a Benz replica. Agencies were established in London and Dublin and the car gained a Gold Medal for efficiency at the 1899 London exhibition. A new more modern four seat model appeared in 1901 with twin cylinder engine made by Buchet and was the first to carry the Belsize name as the "Marshall Belsize" and in 1903 the company name was changed to Belsize Motors and Engineering. In 1906 this changed again to Belsize Motors Ltd.

Before World War I they were a major player in the United Kingdom motor industry employing 1200 people and making up to fifty vehicles a week. A bewildering range of models were made including taxis, commercial vehicles and fire engines with engines of up to 14.5 Litre capacity.

After the First World War they followed a single model policy at first with the 15hp of 2798 cc but this was joined in 1921 by the Belsize-Bradshaw with a 9 hp 1294 cc V-twin engine made by Dorman and designed by Granville Bradshaw that was partly air and partly oil cooled. This gained a reputation for being unreliable and was dropped in 1924. It was replaced by a 1250 cc conventional 4 cylinder model, the 10/20 or RM, and a 1696 cc six the 14/30. The latter was at last an up to date car with overhead valves, four wheel brakes and a four speed gearbox but at £415 to £650 it was expensive when compared with the opposition. It was however, too late and the company which had been in the hands of the receiver since 1923 ceased trading in late 1925.

In a fit of madness the company also tried to build a 2496 cc, straight eight engine but this probably never got past the prototype stage although it was advertised at £1050.

The main models were:

  • 12hp 1728cc 2 cylinder 1901
  • 15/20 2860cc 4 cylinder 1904
  • 18/24 3940cc 3 or 3300 4 cylinder 1906
  • 24/30 5880 cc 6 cylinder 1906-1908
  • 40hp 7774 cc 6 cylinder 1908
  • 60hp 11,724 cc 6 cylinder 1908
  • 14/16 2543 cc 4 cylinder 1909-1913
  • 18/22 3000cc 6 cylinder 1910-1913
  • 10/12 1950cc 4 cylinder 1912-1916
  • 15 2800cc 4 cylinder 1919-23 (enlarged to 3100cc and known as 15/20 in 1923)
  • 9hp Belsize-Bradshaw 1100cc V2 cylinder 1921-1924
  • 14/30 1700cc 6 cylinder 1924-25 (also available with 2500cc straight 8 cylinder as the 20/40)