Straight stairlifts have a maximum track length. The maximum length is usually a limitation of either cable lengths or the motor. Curved stairlifts use custom built tracks and they can accommodate longer stairways when compared to straight stairlifts. Most straight stairlift models can accommodate a stairway up to 20 feet and some have options to accommodate stairways up to 25 feet. Weight limits may differ when a longer track is used.