What are those things on kids bikes called

Those small wheels beside a child’s rear wheel are called training wheels, also known as stabilizers. They support the bike while a child learns to balance, steer, pedal and stop.

What the name refers to

Training wheels are the paired, smaller wheels mounted near the rear wheel. “Stabilizers” is the common alternative term. They are different from the main wheel-size label—such as 12 Inch or 16 Inch—which describes the bicycle’s regular wheels.

If the “things” you mean are on the pedals, handlebars or wheel axles, they may instead be reflectors, streamers, grips or pegs. Location settles the question: a matched pair of little wheels touching or nearly touching the ground beside the back wheel are training wheels.

What to measure before choosing a bike

Measure the child’s standing height and inseam without shoes. Then have the child try the bicycle. Check that the child can stand over it appropriately, reach the handlebars without stretching, turn them with control, and operate the brakes comfortably. Current confidence matters too: a hesitant new rider may need a different setup from a confident rider of the same height.

Do not choose an oversized bicycle merely to leave room for growth. Age is only a starting point; measured height, inseam, reach, brake control and an individual fit check should decide.

Compare the wheel-size starting points

These ranges are XBikes starting points, not proof of fit. Where ranges overlap, compare how the child stands, reaches, controls the brakes and handles the bike rather than automatically selecting the larger wheel.

When the supplied training-wheel bikes are relevant

Both catalog options are relevant when the “things” being sought are training wheels and the rider fits one of their supplied wheel-size choices. They also make it possible to compare sizes while staying within the training-wheel-bike category.

The XJD Kids' Training Wheel Bike for Boys & Girls, 12/14/16 Inch – White is listed in 12 Inch, 14 Inch and 16 Inch sizes. The Girls' Training Wheel Bike by XJD, 12–20 Inch Wheels – Blue is listed in 12 Inch, 14 Inch, 16 Inch and 20 Inch sizes. The second therefore adds a 20 Inch catalog option; that fact alone does not make it a better fit.

These particular catalog choices help answer the title because both are explicitly categorized as training-wheel bikes, while their supplied size labels can be checked against the rider’s measurements and an actual fit trial.

• XJD Kids' Training Wheel Bike for Boys & Girls, 12/14/16 Inch – White

  A training-wheel bike offered in 12 Inch, 14 Inch and 16 Inch size labels, making it relevant when the rider’s measurements and hands-on fit check point to one of those sizes.

• Girls' Training Wheel Bike by XJD, 12–20 Inch Wheels – Blue

  A training-wheel bike offered in 12 Inch, 14 Inch, 16 Inch and 20 Inch size labels. Its 20 Inch option extends the supplied comparison, but fit still depends on the individual rider.

When these products are not the answer

Neither supplied product lists an 18 Inch, 24 Inch or 26 Inch option. If measurement and fit checks point to one of those wheel sizes, these products are nearest-size comparison points only, not substitutes. A 16 Inch bike is not equivalent to an 18 Inch bike, and a 20 Inch bike is not equivalent to a 24 Inch bike.

They are also not relevant if the objects being identified are pegs, reflectors or another component rather than rear support wheels. The catalog facts do not establish whether the training wheels are removable, adjustable or compatible with another bicycle. For those details—as well as assembly, maintenance, load limits and torque—follow the exact product manual or ask a qualified bicycle mechanic.

What to do next

1. Confirm that the parts are a paired set of small rear support wheels.
2. Measure the rider’s height and inseam, then use the table to create a size shortlist.
3. Have the child try the shortlisted size and check stand-over, reach, steering, brake access and confidence.
4. Choose only after the child can control the bicycle; do not size up solely for future growth.
5. Fit a bicycle helmet so it sits level, fits properly and has straps adjusted according to its manufacturer’s instructions.

If the small rear wheels are what you meant, ask for training wheels or stabilizers; then measure the rider and complete the hands-on fit check before selecting one of the listed sizes.