How to assemble a kids' bike

A child's bike needs the same care as an adult's, with added steps: training wheels (stabilisers) set level, a chain guard in place and a seat height the child can reach the ground from.

Time
about 40 min
Difficulty
Easy
People
1 person
Steps
6

Tools needed

  • Spanners (often 13 and 15 mm)
  • Allen keys
  • Pump

Parts to check first

Before you start, lay everything out on a soft surface (the flattened box works) and check it against the parts list in your manual.

  • Frame with wheels
  • Handlebars
  • Pedals (left and right)
  • Training wheels and brackets
  • Seat, chain guard, reflectors and bell

Step by step

  1. Step 1: Fit the handlebars into the stem, line them up with the front wheel and tighten firmly.

  2. Step 2: Fit the pedals: right pedal clockwise, left pedal anticlockwise.

  3. Step 3: Fit the training wheels to the rear axle with their brackets outside the frame, as the manual shows.

  4. Step 4: Set the training wheels slightly off the ground, equally on both sides, so the bike leans a little and the child learns to balance.

  5. Step 5: Set the seat so the child can put the balls of both feet on the ground.

  6. Step 6: Pump the tyres and check the brakes stop the wheels and the child can reach the levers.

Common mistakes

  • Setting the training wheels so the rear wheel lifts off the ground.
  • Handlebars not lined up with the front wheel.
  • Seat too high for the child to stop with their feet.

Safety notes

  • Check the brakes and wheel nuts before each ride.
  • A properly fitted helmet every time.

This is general guidance for this type of product. Your product's own manual comes first: follow its order, fittings and torque values where they differ from this page.

Updated 2026-09-30