Key features of the wheels transform your quinny moodd into a sleek 4 wheel version lockable swivel wheels attaches to the front axle of the quinny moodd frame the quinny moodd front wheel unit black allows the transformation of the quinny moodd 3 wheeler into a practical 4 wheeled stroller with two front wheels with smaller dimensions the front wheel unit is quick and easy to install for an optional unique look to your standard 3 wheeler quinny moodd stroller