For motorcycles, "retrofitting" Cruise Control can refer to two main types of systems: factory-level electronic cruise control (ECC) and aftermarket mechanical or electronic systems. The feasibility and process for each type vary significantly. 

1. Retrofitting factory-level electronic cruise control

For many late-model BMW motorcycles with "ride-by-wire" (electronic) throttles, an official retrofit kit is available from BMW Motorrad. This is a complex but fully integrated factory solution. 

The process

1. Hardware installation: Your dealer will install a new left-hand combination switch with the cruise control buttons. This may require removing panels to access wiring. A new electronic throttle twistgrip may also be necessary depending on the specific model and options.

2. ECU coding: After the hardware is installed, a BMW Motorrad technician will connect the bike to their diagnostic system. They will activate the cruise control feature in the motorcycle's Electronic Control Unit (ECU) by entering a specific enabling code.

3. Integration: Because it is a factory-developed system, it integrates seamlessly with the bike's existing electronics, including the instrument cluster display, clutch switch, and brake switches. 

Advantages

• Seamless integration: Works exactly as if it came from the factory, with full system integration.

• Safety features: Deactivates automatically when the brake or clutch is applied.

• Reliability: Uses genuine, high-quality BMW parts. 

Key considerations

• Compatibility: This option is only available for specific models and model years. You must consult a BMW dealer with your motorcycle's Vehicle Identification Number (VIN) to confirm compatibility.

• Cost: This is typically the most expensive retrofit option due to the high cost of original equipment manufacturer (OEM) parts and dealership labor. 

2. Aftermarket electronic cruise control

For many motorcycles, especially those with ride-by-wire, third-party companies offer electronic cruise control kits. These are "plug-and-play" for many modern bikes and are a robust alternative to a factory system. 

The process

1. Select a kit: Popular brands include MCCruise and Veridian. They offer model-specific kits for a variety of motorcycles.

2. Hardware installation: The kit includes a control module, a wiring harness, and a handlebar-mounted switch. Installation usually involves connecting the harness to the motorcycle's throttle sensor, brake switch, and diagnostic port.

3. No dealer coding: The kits are typically pre-programmed and do not require dealer activation. Once installed correctly, they are ready to use. 

Advantages

• Wider compatibility: Available for a greater range of motorcycles than the official factory retrofit.

• Cost-effective: Often a more affordable option than the OEM kit, particularly if you do the installation yourself. 

Key considerations

• Installation complexity: While many kits are plug-and-play, the installation can still require removing fairings, fuel tanks, or other components to access the correct wiring.

• System integration: While functional, the aftermarket system will not have the same level of deep integration with the instrument cluster or other systems as a factory solution. 

3. Mechanical throttle locks and cruise assists

These are simple, inexpensive mechanical devices that temporarily hold the throttle grip in place with friction to relieve wrist strain. They are not a true cruise control system and do not automatically adjust speed. 

The process

1. Acquire device: Common brands include Kaoko, Atlas, and Go Cruise. They are widely available online and can be universal or bike-specific.

2. Simple installation: Installation is usually quick and straightforward, involving clamping the device to the throttle assembly or replacing a bar end.

3. Friction-based operation: The rider engages the lock manually by pressing or flicking a lever to hold the throttle position. 

Advantages

• Low cost: The most budget-friendly option.

• Universal fit: Many models can be fitted to almost any bike.

• Instant relief: Provides quick rest for the rider's hand on long, constant-speed stretches of road. 

Key considerations

• Not a cruise control: The system does not actively maintain a set speed. The bike's speed will vary with changes in road grade or wind.

• Requires attention: The rider must monitor the speed and disengage the lock when needed. It does not disengage automatically with brake or clutch input, although most designs allow manual override.