Rider Safety Enhancements

RDRS Safety Enhancements are a collection of technology designed to match motorcycle performance to available traction during acceleration, deceleration, and braking. The systems are designed to aid the rider in controlling the vehicle while accelerating and braking in a straight line or while in a turn. A rider may find the systems most helpful when riding in adverse road conditions and in urgent situations. The systems are electronic and utilize the latest chassis control, electronic brake control, and powertrain technology.

Select features are standard on all CVO™, Trike, Pan America™ 1250, and the Sportster® S. It is optional on all other Model Year 2021 Touring. The RDRS features below are for U.S. models. RDRS features vary by model and may not be available in some markets. RDRS Safety Enhancements may vary from motorcycle to motorcycle. For complete information, please see H-D.com/RDRS for information and videos explaining features, functions, and availability.

  • Electronically Linked Braking (ELB)
    Electronically Linked Braking (ELB) applies braking effort to both wheels when the rider uses either the hand lever (front) or foot pedal (rear) brake control, which can help many riders achieve better braking performance.
  • Cornering Enhanced Electronic Linked Braking (C-ELB)
    Cornering Enhanced Electronic Linked Braking (C-ELB) takes into account the motorcycle lean angle or Trike lateral acceleration. C-ELB will alter the proportioning of brake pressure between the front and rear brakes when braking while cornering in an attempt to improve the ability of the bike to maintain the rider’s intended path.
  • Antilock Braking System (ABS)
    ABS is designed to prevent the wheels from locking under braking and helps the rider maintain control when braking in a straight-line, urgent situation.
  • Cornering Enhanced Antilock Braking System (C-ABS)
    Cornering Enhanced Antilock Braking System (C-ABS) is a variant of ABS that takes into consideration the lean angle of a two-wheel motorcycle, or the lateral acceleration of a Trike model. The brake pressure required to limit wheel slip when cornering is typically or lower than the pressure required under straight-line operation.
  • Drag-Torque Slip Control System (DSCS)
    Drag-Torque Slip Control (DSCS) is designed to reduce excessive rear-wheel slip under deceleration, which typically occurs when the rider makes an abrupt down-shift gear change or decelerates on wet or slippery road surfaces.
  • Cornering Enhanced Drag-Torque Slip Control System (C-DSCS)
    On models equipped with C-DSCS the action of DSCS may be tailored when cornering, based on detected lean angle (two-wheel motorcycles) or lateral acceleration (Trike models).
  • Vehicle Hold Control (VHC)
    The primary function of VHC is to keep the motorcycle from rolling, making it easier to ride away when starting on a hill, a bridge, or a parking ramp.
  • Tire Pressure Monitoring System (TPMS)
    TPMS alerts the rider to low tire air pressure. Maintaining proper tire air pressure is important both for vehicle performance and tire life.

Full disclaimer: Available traction is determined by the road/tire interface. The systems bundled into the RDRS are only able to adjust brake pressure or powertrain torque in an attempt to keep the forces at the tire from exceeding available grip. These technologies do not have the ability to increase grip, or to intervene when the rider has not made a brake or throttle application (e.g., coasting through a corner with the clutch disengaged). RDRS is not a system to directly influence vehicle direction. This is a key difference between motorcycle RDRS and Automotive Stability Control. The rider is ultimately responsible for speed, steering, and path corrections.

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