A modern motorcycle ride by wire throttle (sometimes called ‘drive by wire’) refers to the absence of mechanical linkage between the accelerator and throttle.
Older and conventional motorcycle throttles utilise a cable twist grip with considerably more friction in the mechanism preventing inadvertent opening of the throttle, for example when going over road bumps or riding off-road.
With ride by wire motorbikes, the twist grip uses an electronic position sensor to determine how much throttle is being applied. There is no friction in the operation and the only resistance felt by the rider is provided by the return spring so the throttle can feel over sensitive.
If riding off-road or over speed bumps a light and sensitive electronic twist grip can make it difficult to control the motorcycle precisely, even potentially leading to an accident.