Ventilated Child Bicycle Seat with Frame Mounting for children 9 months to 6 years, maximum weight 22kg. Designed for round tubes 28 to 40mm, mounting block requires 80mm. The Joy seat is the ultimate rear bike seat for safely transporting your child. Its smart cooling vents provide continuous airflow, keeping your little one comfortable on every ride, while the lightweight design ensures the seat is easy to handle when riding without your child. Timeless and stylish, Joy's clean, minimalist design complements any bike, combining elegance with practical functionality. Quick and safe to install, it's the perfect choice for everyday rides, family adventures, and city, e-bike, or MTB biking.