How to put training wheels on a kids bike

2026-08-22

To put training wheels on a kids bike, first confirm the bike and training-wheel kit are compatible, then install them exactly as the manual directs.

Measure and compare before installing

Start with the size printed on the bicycle tire’s sidewall. That identifies the nominal wheel size, but it does not prove that a particular training-wheel kit will fit. Compare the bike’s wheel size, rear-axle design, available mounting space and any frame or drivetrain obstructions with the compatibility information in the exact kit manual.

Inspect the complete kit before beginning. Identify every bracket, fastener, washer and retaining part by matching it to the manual. Do not substitute hardware or assume that a bracket intended for another axle or wheel size is equivalent. If the manual is missing, the fit is uncertain or the mounting points differ from its diagrams, stop and ask a qualified bicycle mechanic.

Check that the bicycle fits the child

Training wheels cannot correct an oversized or poorly fitting bicycle. Measure the child’s standing height and inseam, then have the child try the bike. Check stand-over clearance, comfortable reach to the handlebar, reliable access to the brakes and the ability to control the bicycle while seated. Current confidence matters as well as body measurements.

Wheel size	XBikes starting height	Age starting point
12 Inch	34–40 in / 86–102 cm	3–4
14 Inch	37–45 in / 94–114 cm	3–6
16 Inch	40–48 in / 102–122 cm	4–7

These ranges are starting points, not substitutes for trying the bike. Prioritize measured height, inseam, reach, brake control and confidence over age. Do not buy or use an oversized bicycle merely to allow room for growth.

Install the training wheels in the correct order

Stabilize the bicycle. Place it on a firm, level surface where it cannot roll or fall while you work. Keep the child away from the work area.
Read the bicycle and kit manuals together. Confirm the stated wheel-size and axle compatibility, the correct orientation of each bracket, the required hardware sequence and any warnings.
Expose only the specified mounting area. Remove or loosen rear-axle hardware only if the instructions explicitly require it. Do not disturb brake, gear or wheel-retention parts unnecessarily.
Fit both assemblies. Position the left and right brackets exactly as illustrated, using only the supplied or manufacturer-specified hardware. Keep each bracket clear of the chain, drivetrain, brakes, spokes and tire.
Set their position. Follow the manual’s specified height, alignment and ground-clearance procedure. Do not invent a gap or copy a measurement from an unrelated kit.
Tighten and verify. Use the manufacturer’s tightening sequence and torque specification. If no applicable specification is available, have a qualified bicycle mechanic complete the work.

Perform a check before the first ride

Confirm that the rear wheel is centered and securely retained, both training-wheel brackets are correctly oriented, and no part can contact a moving component. Roll the unloaded bicycle slowly and check that the wheels turn freely. Apply the brakes and make sure they operate normally.

Next, have the child sit on the bike while an adult holds it stationary. Recheck reach, brake access and control. The first ride should be in a flat area away from traffic and obstacles, with close adult supervision. The child should wear a properly fitting bicycle helmet that sits level, with its straps adjusted according to the helmet manufacturer’s instructions.

Stop riding if a bracket shifts, hardware loosens, the bike pulls unexpectedly, a training wheel contacts the drivetrain or brakes, or the child cannot control the bicycle. Reinspect the installation using the exact manuals or take the bike to a qualified mechanic.

How the available XBikes options relate

The catalog options are complete training-wheel bicycles rather than evidence that a separate kit fits an existing bike. The Girls 12/14/16 Inch Kids Bike by XJD with Training Wheels – Peach is offered in 12 Inch, 14 Inch and 16 Inch labels. The XJD Light Purple Girls Bike with Basket, Training Wheels, 12/14/16/20 Inch is currently represented by supplied 12 Inch, 14 Inch and 16 Inch SKU labels. They help compare bicycles already configured with training wheels across those stated sizes; their titles do not establish fit for a child or compatibility with another bicycle.

Make the final decision

Proceed only when the child fits the bicycle and the exact bike-and-kit combination is explicitly supported by its instructions. Otherwise, choose a correctly fitting bicycle already offered with training wheels in the needed size, or have a qualified mechanic identify and install a compatible kit.