Designed with several key aspects in focus, JConcepts introduces the Silent Speed line of spur gears for select Team Associated vehicles. Spur gears or straight-cut gears are some of the simplest forms of gears, however they directly influence the ratio, speed and sound of R/C vehicles and they are extremely important. These gears when meshed together correctly provide the transfer of power from the motor to the transmission and are one of the key elements in the versatility and sound of the vehicle. Read more via the source link. Source: http://www.redrc.net/2011/10/jconcepts-silent-speed-spur-gears/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+RedRc2+%28Red+RC+-+RC+Car+News+DF%29
