for Vespa 50 S 3??/Special V5B3T 3??/V5B4T 2??/SR (D)/100 2??/125 PV 2??/ET3 2??/PK50/S/SS/XL/2/FL/PK80-125 S/PK125/ETS/N//XL/XL2 96,7 mm Product description DRT stands for the Denis Racing Team and is a guarantee for race proven gear box components, based on experiences collected in Rally Sport. The racers and mechanics on the Italian sprinting scene swear by the DRT products and these high end gearbox parts are also included in the racing scooters of the -STOFFI racing team. Well coordinated gear ratios helps your motor deliver its power more smoothly and constantly and can be decisive over a win or loss in a racing situation. It is almost an art, to be able to set your gearing up to remain within the power-band every time you change up to another gear. If you have ever been happily accelerating behind a truck on the motorway just to lose all of your power while attempting to overtake due to the extra wind resistance will appreciate the use of the shorter fourth