This is the ultimate accessory for your mountain biking child, the Kids Ride Shotgun Pro Child Bike Seat + Handlebars Combo is really fast and simple to fit and remove and there is no actual frame contact and adjustable to fit all sorts of bikes from e-bikes to mountain bikes.Designed for children 2 5 years (up to 60lb / 27kg)Lightning fast to fit, remove and swap between bikesZero frame contactFolds flat for storageFully adjustable to fit all electric and regular mountain bikesFully adjustable leg length to grow with your childFits all mountain bikes with standard 1 1 8 steerers (10mm stem clearance required). Adaptors for Trek Knock Block and Scott Syncros headsets sold separatelyPro bars fit 31.8mm and 35mm handlebar diameters