Piaggio Vespa Driveshaft & Gearbox Kit PX (1984-Onwards), T5 125, Cosa, LML Star 2t-4tPiaggio Vespa Driveshaft & Gearbox Kit PX (1984 Onwards), T5 125, Cosa, LML Star 2t 4t Something that generally isn't changed so often is the Gear Box parts. Every rebuild we perform we double check the condition of the gears and the driveshaft as they can become worn overtime. Make sure you check the threads as well, Damaged threads can cause the rear hub not to secure properly on the shaft. The gear ratio for the standard PX125 is 58, 42, 38, 36