Do you mean Solo's?
The first ever speedway meeting was held here in Australia at Maitland NSW in 1923, and using a Model T ford as the track groomer, I have a mate who's grandfather was there when the track was being built, here is some info from Wikipedia on it.
The first speedway meeting, as reported in the Maitland Mercury newspaper, took place on 15 December 1923 at the Maitland Showground in the Lower Hunter Valley, New South Wales, Australia. There is evidence that there may have been earlier meetings in Australia and broadsiding on small dirt tracks had been practised in America since before World War I. A rider named Don Johns was known to have done this before 1914. It was said that he would ride the entire race course wide open, throwing great showers of dirt into the air at each turn.[citation needed] His style of cornering was followed in the United States by riders such as Albert "Shrimp" Burns, Maldwyn Jones and Eddie Brinck well before 1923. The first meeting in the United Kingdom took place at High Beech on 19 February 1928.[2] There are, however, claims that meetings were held in 1927 at Camberley, Surrey and Droylsden, Lancashire. Despite being described as "the first British Dirt Track meeting" at the time, the meeting at Camberley on 7 May 1927 differed in that the races were held in a clockwise direction.[3] Races at Droylsden were held in an anti-clockwise direction but it is generally accepted that the sport arrived in the United Kingdom when Australians Billy Galloway and Keith McKay arrived with the intention of introducing speedway to the Northern Hemisphere. Both featured in the 1928 High Beech meeting. The the first speedway meeting in the UK to feature bikes with no brakes and broadsiding round corners on loose dirt was the third meeting held at High Beech on 9 April 1928, where Colin Watson, Alf Medcalf and "Digger" Pugh demonstrated the art for the first time in the UK. Proto speedway was staged in Glasgow at the Olympic Stadium (Glasgow Nelson) on April 9, 1928 and the first fully professional meeting was staged at Celtic Park on April 28, 1928. The first meeting in Wales was staged at Cardiff White City on Boxing Day 1928.
A speedway rider waits at the start gate for his 3 opponentsIn the late 1920s, Australian Colin Stewart of Colac, Victoria won the prestigious Silver Gauntlet. He also achieved success at an international level, racing for Southampton in 1929 and captained the Glasgow in the Northern League in 1930 before moving to Wembley in 1931, for whom he rode in just four matches, averaging 4.00 points per match. He also raced in the 1930 Scottish Championship which was won by Wembley's Harry Whitfield.
The forerunner of the World Championship, the Star Riders' Championship, was inaugurated in Great Britain in 1929 but was split in to two sections as it was felt that the British riders were not yet the equal of the Australians and Americans. Frank Arthur won the Overseas Section and Roger Frogley the British. The following year the two sections were amalgamated and Vic Huxley proved to be the winner.[4] Huxley was also runner-up three times and won the first British Match Race championship in 1931.