a handlebar control in the form of a ratchet-controlled rotating grip, used on some bicycles and motorcycles as a gear-change control and on motorcycles as an accelerator
twist grip in Automotive Engineering
(twɪst grɪp)
Word forms: (regular plural) twist grips
noun
(Automotive engineering: Vehicle components, Bodywork, controls, and accessories)
A twist grip is a control that you operate by twisting it with your hand, such as the control for the throttle of a motorcycle.
Disconnect the throttle cable at the twist grip.
The throttle is a twist grip that the rider turns to increase speed.
Turns are made by rotating a twist grip on the left handlebar.