Symptoms
- One training wheel touches the ground before the other
- Bike rocks side to side when stationary
- Training wheel bracket feels loose
- Training wheel makes noise while riding
Likely causes
- CommonUneven height adjustment between the two wheelsTraining wheels need to be set at matching, slightly-off-ground heights to work as intended.
- CommonLoose mounting bolts or bracketVibration from riding can loosen the bolts holding the bracket to the rear axle.
- PossibleWorn training wheel bearing or axleThe small wheel and axle assembly can wear out with heavy use.
What to do
- Flip the bike over or hold it upright and check the height of each training wheel relative to the ground and to each other.
- Adjust the bracket mounting so both training wheels sit at the same height, typically slightly above the ground so the rear tire carries most of the weight while turning.
- Tighten all bracket mounting bolts to the rear axle securely.
- Spin each training wheel by hand to check for smooth rotation without excessive play or wobble.
- Test ride slowly in a safe area to confirm the bike feels stable and doesn't rock excessively side to side.
- Replace a training wheel assembly if the wheel itself is cracked, bent, or has failed bearings.
- This is a simple adjustment most people can do at home without needing a bike shop.
Tools and parts
- Wrench set appropriate for the bracket bolts
Training wheels setSearch: “kids bike training wheels replacement”
When to call a pro
A bike shop can help fit and adjust training wheels correctly if you're not confident doing it yourself.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.