Worked these transmision ratio's out on a scrap of paper some time ago. Finally got around to putting them on a spreadsheet. There may be some slight anomalies with rolling radius of tyres, but close enough I think.

[Linked Image]

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone