Malossi draw on 20 years of tuning transmissions. The new HTQ gears were designed and built with straight / helical teeth to minimise losses through friction and stress on the supports. More importantly the Malossi gears increase ratios slightly enabling you to exploit the full power of your vehicle, thus significantly increasing its original performance potential. A longer ratio allows for higher top end speed. Longer ratios are only really suitable on tuned engines. For use on Piaggio engines from 1999 on (pressed sprocket and linking shaft). Aprilia SR (carb.) 50 2T LC 2004-> (PIAGGIO) SR R FACTORY 50 2T LC (PIAGGIO C361M) SR DITECH GP1 50 2T LC (PIAGGIO C361M) SR R (carb.) 50 2T LC (PIAGGIO) SR Street 50 2T LC euro 2 Derbi GP1 50 2T LC GP1 OPEN 50 2T LC for vehicles WITH PRESSED fitting PRIMARY gear GP1 REVOLUTION 50 2T LC Gilera ICE 50 2T RUNNER PureJet 50 2T LC <-2005 RUNNER PureJet 50 2T LC 2006-> RUNNER SP 50 2T LC <-2005 WITH PRESSED fitting PRIMARY gear RUNNER SP 50 2T LC 2006-> (C451M) WITH PRESSED fitting PRIMARY gear RUNNER 50 2T LC WITH PRESSED fitting PRIMARY gear STALKER 50 2T WITH PRESSED fitting PRIMARY gear TYPHOON X 50 2T Piaggio FLY 50 2T NRG EXTREME 50 2T NRG EXTREME 50 2T LC NRG MC2 50 2T LC 1998-> NRG MC3 Purejet 50 2T LC NRG MC3 DT 50 2T NRG MC3 DD 50 2T LC NRG Power DD 50 2T LC NRG Power DT 50 2T (C453M) NRG Power Purejet 50 2T LC TYPHOON 50 2T 2007->2010