Best kids’ bikes under £400 for school runs and weekends

• Frame: aluminium alloy is standard; steel appears on cheaper or heavier models
• Weight: typically 9–12kg depending on wheel size and spec
• Gears: single-speed or 6–8 speed derailleur systems; wide ranges are rare
• Brakes: V-brakes are most common; mechanical disc brakes appear at the top end
• Wheels: sturdy double-wall rims, usually prioritising strength over lightness
• Extras: mudguard and rack mounts are common, but guards and lights are rarely included

• Excessive weight — heavy bikes are harder for kids to control and enjoy
• Twist-grip shifters that are stiff or poorly positioned for small hands
• Suspension forks with no damping, which add weight but little comfort
• Poor adjustability, such as limited seatpost extension or fixed stems
• No mounts for mudguards or a rear rack, limiting school-run practicality
• Cheap tyres that are slow-rolling and puncture-prone