Austin Seven Andes 3 Speed Gear Ratios

A common option to extend the gearing on a 3 speed gear box is to install Andes Gears which change the ratio of 2nd gear from 1:82 to 1:66, with first and top staying as 3:25 and 1:1 respectively. The table below provided by Vince Leek shows the difference in rev/speed between the original and the Andes 2nd gear.

Douglas Alderson DA7C