Rival Rv502 Nitro Plus 3-Wheel Children's Bicycle Eva Filling, No Explosion, No Sound Children's Bicycle BlackRival Rv502 Nitro PLUS 3 Wheel Children's Bicycle Eva Filling, Explosion Proof, No Sound Children's Bicycle Suitable for Children between Height (85 120cm). Main Body, Steering Wheel and front fork are made of profile iron. Durable Plastic Used. A non sweating cushion is used on the 3 axis adjustable seat. It has wide use front and rear baskets. There is a single center brake system on the rear wheels