The top speed of a Royal Enfield Bullet motorcycle can vary depending on the model, engine specifications, and other factors. However, most Royal Enfield Bullet models have a top speed in the range of 120 to 140 km/h (75 to 87 mph). It's important to note that Royal Enfield motorcycles are known for their classic design and a focus on torque and low-end power, rather than high-speed performance. These bikes are typically more suited for leisurely cruising and enjoying the ride rather than chasing top speeds.