i-adjective
hard to ride; difficult to ride
Describes a vehicle, animal, or device that is physically uncomfortable, awkward, or difficult to ride or mount.
この自転車はサドルが高すぎて乗りにくい。
This bicycle is hard to ride because the saddle is too high.
あの馬は気性が荒くて乗りにくい。
That horse is difficult to ride because of its rough temperament.
Antonym: easy to ride.
Refers to riding comfort as a noun, while 乗りにくい is an adjective describing difficulty.
Compound of 乗り (continuative form of 乗る 'to ride') + にくい ('difficult to do').