I bought these cogs for a scooter Jaiue Bianci Amante, first I changed the capacity then it was time for the gears, after replacing the gears riding this scooter is a fairy tale speed has increased by 20 km / h and the culture of the engine has become incredibly comfortable earlier the engine was howling very loudly until the helmet vibrated, now on the new gears riding comfort is amazing you must also properly select the variator pulleys I used 10g I think that as for a set of these gears if someone wants to improve something this is a set of mandatory.