Because the enamel are angled, they run much quieter than the more economical straight-Minimize steel gears. It took me some time to find this tear-down pic verifying the gears were helical. Pic courtesy of this youtube https://alyshaswup117331.actoblog.com/29500608/the-definitive-guide-to-talaria-sting-r-mx4-top-speed-without-limiter