Assertion: transmission's gear | /r/CapableOf | spin at same speed
Facets:
value: during the shift
type: TEMPORAL
value: roughly
type: DEGREE
Source sentences:
text: The gears were typically engaged by sliding them on their shafts (hence the phrase shifting gears), which required careful timing and throttle manipulation when shifting, so the gears would be spinning at roughly the same speed when engaged; otherwise, the teeth would refuse to mesh.
text: By having the two gears spinning at the same speed during the shift, gear synchronizers create a smooth, seamless shifting experience.