Looking for a family friendly activity on Oahu? Why not rent a bike on Oahu. The safe-T-seat is designed for children age 4 and under. The minimum age is 12 months as the child needs to be able to sit up well and hold the weight of a helmet on his/her head. The maximum height of the child that can use the safe-T-seat is 42 inches. The recommended max weight is 38 lbs. Above 38 lbs and the maneuverability of the bike may be affected. Oahu bike rentals are limited to North Shore bike rentals and Kailua bike rentals.