The Stabilizer kit is perfect for individuals who have trouble balancing a two-wheel bicycle without any assistance. Equipped with 12″ Mag wheels this product is constructed of heavy-duty steel which has been test approved EN14765. Suitable for children from 6 years to adult up to 120 kg. (18 stone) Can be easily fitted to most cycles from 20″ wheel size to 700c. This product doesn’t fit quick release wheels / 3 speed hub gears or electric bikes !