The Shotgun Pro combo is the ultimate setup for your mountain bike kid. Lightning fast to attach and remove, zero frame contact and adjustable to fit electric & regular mountain bikes.Key Features:Designed for children 25 years (up to 60lb / 27kg).Lightning fast to fit, remove and swap between bikes. Zero frame contact. Folds flat for storage.Fully adjustable to fit all electric and regular mountain bikes.Fully adjustable leg length to grow with your child.Fits all mountain bikes with standard 1 18 steerers (10mm stem clearance required). Adaptors for Trek Knock Block and Scott Syncros headsets sold separately.Pro bars fit 31.8mm and 35mm handlebar diameters.