After being overlooked for the Olympics, Lamb chose to turn professional in February 1928, for £1,000 for the season. In his first race as a professional he won a 10-mile Motor-paced event in a season best time of 11' 56". Lamb again rode the Goulburn to Sydney in 1928, again from scratch, this time as a professional and came second behind
Ken Ross, also from scratch. In 1929 Lamb won the
Austral Wheel Race . He then spent six months riding in the United States, defeating motor-paced champion
Franco Giorgetti, George Chapman, Charles Jaeger, and Francesco Zucchetti. Lamb also led the first 2 days of the 6 days’ race at Chicago but had to withdraw due to injury. Lamb twice won the
Australian national road race title in 1930 and 1932, by winning the Blue Riband for the fastest time in the
Warrnambool to Melbourne.. Lamb set a record time of 6h 21' 18" in 1932, nearly 2 hours faster than his time in 1930. Lamb rode in the
1931 Tour de France in a combined Australia/Switzerland team including Opperman,
Ossie Nicholson and
Frankie Thomas. He finished in 35th place and was the
last finisher. After the Tour de France, Lamb won the Grand Prix de Marseilles (motor pace) In 1932 Lamb won the Brisbane, Six Days with
Jack Standen, defeating a quality field including Frankie Thomas, Opperman and
Jack Fitzgerald. He had a falling out with Bruce Small in September 1932, going to work for a rival manufacturer Finlay Brothers. In February 1933 Lamb rode 60 miles and 575 yards in an hour to break the motor paced record set by Opperman in 1930. By April 1933 Lamb had reconciled with Bruce Small, with advertisements quoting Lamb as stating "from now on, I'm sticking to Malvern Star". He also won the
Tour of Tasmania, a six-day stage race covering , beating Frankie Thomas by 1 second. In 1934 Lamb again won the Tour of Tasmania, titled the "Batman 1000" a race over 8 stages covering starting in
Launceston and finishing in
Ulverstone. Lamb narrowly defeated
Ern Milliken with Opperman in 3rd place. Lamb had barely completed one long stage race when he set off in the next, for the rich prize purse in the
Centenary 1000, a one-week race over seven stages covering that carried with it the
Australasian road championship title. While Lamb did not feature in the early stages, his strength showed through on the arduous sixth stage, extended to 152 miles (245 km) after stage 5 had to be stopped at
Mount Buffalo due to a torrential downpour of rain hail and sleet. Lamb was 3rd and fastest at
Sale, and finished 3rd overall in the championship and the Australasian road championship title. ==Personal==