Dub Gear Ratios - the easy way to calculate gear ratios and tire sizes for your air cooled Volkswagen! Sixteen different transaxles. Full complement of wheel and tyre sizes. Custom ratios. 4 or 5 speed boxes. Chart showing RPM, speeds and shift points. Tags: gear, gears, gearbox, box, trans, axle, swingaxle, swing, ratio, diff, differential, vw. Volkswagen. Type 1.