Fuel Moto has tuned an extensive amount of RDRS equipped bikes, and we own a RDRS equipped 2020 Road Glide for in-house calibration & product development. What’s with that traction control switch? The Reflex Defensive Rider System otherwise known as “RDRS” on select 2020-later Harley Davidson® motorcycles is a new feature designed to control engine power & braking based on available traction during acceleration, deceleration, and braking to allow the rider better control of the motorcycle.ĮFI tuning of RDRS equipped bikes is different than other machines, however when understood and tuned properly the systems continue to operate as designed.