Post-war Baldwin became one of the first professional motorcycle racers. He competed twice in the
Isle of Man TT Senior Race, riding a Martin in
1921, but failing to finish, and riding a
Rudge in
1922 and coming 14th. He eventually found fame riding a
Zenith V twin at
Brooklands, competing in solo and sidecar races ranging from a single lap to 500 miles. and coming second in 1925. He was awarded the Brooklands Gold Star Medal for completing a lap at an average speed over in 1927, and competed in the Brooklands 200 mile race four times between 1925 and 1929, winning once, and coming third three times. Baldwin's greatest achievement came at
Arpajon in 1928 when riding his
Zenith-
JAP he became the first man to ride a measured kilometre at an average speed of over , taking the official
FIM motorcycle land-speed record. ==References==