and likely with any speedo as the tolerance the manufacturers have to work to is 0 to 10% + 6.25mph over read. A true 40mph could legally display as 50.25mph on the speedo therefore, however unlikely.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone