Crownwheel as originally fitted to Austin and Morris 1100 cars it was used for competition on minis. must be used with 15 tooth pinion 22G99. this 4.1 ratio was very popular with hill climb vehicles in the 60s and 70s
The final drive gears are ultimately responsible for the way your Mini goes after engine, gearbox, and under carriage tweaking has been applied. The aforementioned and the degree to which it has been done will affect the decision as to what Final Drive is required. They’re also responsible for much discussion between many tuning freaks, and confusion to the less informed.