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Harley Davidson RDRS system. What is it and why is it necessary

Harley Davidson RDRS

If you follow the news from Harley Davidson, then you’ve probably already heard about the new RDRS system. But what is it and why is it needed?

Harley Davidson RDRS

In short, RDRS stands for Reflex Defensive Rider Systems (HD marketers skillfully come up with names for systems using a good play on words. In this case, the name can be translated as Interactive Rider Protection System, or it can be – as a System that protects the rider from reflexes – remember Keith Code PIS ?). In other words, it is a set of sophisticated electronics designed to match engine thrust to available grip headroom during acceleration, deceleration and braking – including cornering.

RDRS consists of a set of electronic assistants:

  • Cornering Enhanced Electronic Linked Braking – Combination Brakes with Tilt Tracking
  • Cornering Enhanced Traction Control System – traction control with tilt tracking
  • Cornering Drag-Torque Slip Control System – tilt tracking engine braking system
  • Vehicle Hold Control – help on the slope
  • Tire Pressure Monitoring – monitoring tire pressure

First found on most 2020 touring models, the RDRS allows riders to maintain control of the bike, especially in bad weather or unexpected situations. RDRS uses sensors installed on the motorcycle to transmit data to the on-board computer. This data allows the computer to calculate the position of the motorcycle in space – whether it is traveling vertically in a straight line, whether it is leaning in a corner, whether it is going up or down a slope. The computer then controls the pressure in the brake circuits or electronic gas, adding or subtracting traction or braking force, depending on the situation.

Uniform braking

Cornering Enhanced Electronic Linked Braking (C-ELB) activates the brake calipers on both wheels when the rider uses the front brake lever or the rear brake pedal to provide even braking on both wheels. The C-ELB takes into account the angle of the bike and distributes the braking force so that the rider maintains the selected trajectory when using the brakes, even in a corner.

Prevents rear wheel slippage

Cornering Enhanced Traction Control System (C-TCS) prevents slipping of the rear wheel due to excess traction on it, both on straight sections and in bends. This is especially important when driving on wet or slippery roads, or when the type of road surface changes unexpectedly. Also, this system helps when driving on dirt roads.

Cornering Enhanced Drag-Torque Slip Control System (C-DSCS) Reduces rear wheel slip when decelerating – for example, when changing gears downward or when braking hard on slippery roads – by adjusting engine thrust to match the rear wheel speed and the vehicle’s travel speed. Thus, even in the event of a breakdown, the rear wheel rotates exactly at the speed at which it most reliably regains traction with the road surface. The C-DSCS calculates the amount of intervention needed based on the measured lean angle of the bike in order to perform more precisely in corners.

Braking system on a slope

Vehicle Hold Control (VHC) activates and maintains brake pressure on a slope to prevent the motorcycle from rolling when the rider releases the brake. This feature is especially useful when stopping on a slope and then driving again, as the brakes are automatically deactivated when the rider releases the clutch and turns on the throttle. HD warns that the VHC cannot be used as an emergency brake and that the system is disabled when the side stand is extended.

Tire pressure

Tire Pressure Monitoring System (TPMS) is quite a typical function from the automotive industry. This system monitors the tire pressure, displays it on the on-board computer screen and warns of too low a pressure.

The RDRS kit comes in stock on all HD CVO 2020, LiveWire, Tri-glide ultra and Freewheeler. It is also available as an option on all 2020 touring models with the exception of the Electra Glide Standard.

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