A 20-inch training wheel bike is built for kids roughly 6 to 9 years old who are learning to ride

The 20-inch measurement refers to the diameter of the wheels, not the frame size. At this wheel size, the bike sits low enough for a child to touch the ground with their toes while seated, which is the safety standard for learning bikes. Training wheels attach to the rear axle and keep the bike upright while your child builds balance and pedaling confidence.

Most 20-inch bikes come with training wheels already installed, though some are sold separately. The bike itself typically weighs between 25 and 35 pounds, light enough for a child to handle but heavy enough to feel stable. The seat height usually adjusts from about 18 to 22 inches off the ground, which matters because a seat that is too high or too low makes pedaling harder and less safe.

Key Takeaways

  • A 20-inch wheel bike fits children roughly 6 to 9 years old, with seat height adjustable so the child can touch the ground with their toes while sitting.
  • Training wheels should be set so they barely touch the ground when the bike is upright, allowing the child to feel the bike lean slightly as they gain balance.
  • Most training wheel bikes cost between $80 and $200 depending on frame material, brake type, and whether training wheels are included.
  • Training wheels are temporary — plan to remove them once your child can ride 20 to 30 feet without wobbling, usually within a few weeks of regular practice.

Wheel size and frame fit matter more than age alone

A child's inseam (the distance from their crotch to the ground while standing) is the real measure of fit, not their age. For a 20-inch wheel bike, your child should have an inseam of roughly 18 to 24 inches. If the inseam is shorter, a 16-inch bike is safer. If it is longer, a 24-inch bike may be better.

To measure inseam, have your child stand barefoot with their back against a wall and their feet about 6 inches apart. Measure from the floor to the inside of their thigh. Then check the bike's seat height range — the manufacturer's spec sheet will list the minimum and maximum seat height. The seat should adjust so your child's leg is almost straight when the pedal is at its lowest point, with a slight bend at the knee.

Training wheel setup affects how quickly your child learns

Training wheels work best when they are set just barely off the ground. If they are too low, they carry too much of the bike's weight and your child never feels the bike lean, which means they do not learn balance. If they are too high, the bike tips over sideways. The goal is for the training wheels to touch down only when the bike tilts past about 15 degrees.

Most training wheels have a bolt or bracket that lets you adjust the height. Start with them just touching the ground, then have your child ride in a straight line. If the bike feels wobbly or your child is gripping the handlebars hard, lower the training wheels slightly. If they feel locked in place and the bike does not lean at all, raise them a bit. This adjustment takes trial and error, but it is worth the time.

Brake type affects how much hand strength your child needs

A 20-inch training wheel bike typically has one of three brake types: coaster brakes (pedal backward to stop), hand brakes on the handlebars, or both. Coaster brakes require no hand strength and work when ready, which is why many training bikes use them. Hand brakes require your child to squeeze with enough force to slow the bike, which younger children sometimes cannot do reliably.

If your child has weak grip strength or is very young (closer to 6), a coaster brake or dual-brake setup is safer. If your child is older or stronger (closer to 9), hand brakes alone are fine and actually better practice for adult bikes. Some bikes let you remove the training wheels and keep the coaster brake, which is useful because coaster brakes work on any bike size.

Material and weight affect how straightforward the bike is to handle

Training wheel bikes come in steel or aluminum frames. Steel frames are heavier (30 to 35 pounds) but cheaper and more durable if the bike gets dropped or crashed. Aluminum frames are lighter (25 to 30 pounds) and easier for a child to maneuver, but they dent more easily and cost more upfront.

For a learning bike, the weight difference matters. A lighter bike is easier to balance and control, especially if your child is small or cautious. If you plan to use the same bike for multiple children or keep it for years, steel is more practical because it survives rough use. If your child is struggling with balance, aluminum might help them progress faster.

Training wheels are temporary — plan to remove them within weeks

Training wheels are a tool for the first few weeks, not a permanent feature. Most children are ready to ride without them after 2 to 4 weeks of regular practice, usually 30 minutes to an hour per day. The sign that your child is ready is when they can ride 20 to 30 feet in a straight line without the training wheels touching the ground.

When you remove the training wheels, do it gradually. Start by loosening the bolts so the training wheels are just barely off the ground, then have your child ride. They will feel the bike lean slightly, which teaches balance without the fear of falling hard. After a few rides, remove the training wheels entirely. Expect some wobbling and a few small falls — that is normal and part of learning. A helmet and wrist guards reduce injury risk during this phase.

Price and where to buy

A basic 20-inch training wheel bike costs between $80 and $150 at big-box retailers like Walmart or Target. Mid-range bikes from brands like Huffy, Kent, or Schwinn run $120 to $200 and usually have better brakes and lighter frames. Specialty bike shops carry higher-end models ($200 to $300) with better components, but they are not necessary for learning.

Used bikes are an option if your budget is tight. Check Facebook Marketplace, Craigslist, or local buy-sell groups for 20-inch bikes in good condition. A used bike should have no rust on the frame, working brakes, and training wheels that are not cracked or bent. Buying used saves 30 to 50 percent but means you cannot return it if something breaks.

Frequently Asked Questions

Can my child ride a 20-inch bike if they are 5 years old?

It depends on their inseam. If their inseam is 18 inches or longer, a 20-inch bike with the seat at its lowest setting may work. If it is shorter, a 16-inch bike is safer because your child will have better control and confidence. Measure their inseam first — age is less reliable than actual leg length.

How do I know when to remove the training wheels?

Remove them when your child can ride 20 to 30 feet in a straight line without the training wheels touching the ground. This usually takes 2 to 4 weeks of regular practice. Start by loosening the training wheel bolts so they barely touch the ground, then remove them entirely once your child feels stable.

Do training wheels slow down learning?

Not if they are set correctly. Training wheels that are too low prevent your child from feeling the bike lean, which does slow balance development. Set them just barely off the ground so the bike tilts slightly as your child rides. This teaches balance while keeping them safe.

What is the difference between coaster brakes and hand brakes?

Coaster brakes work when your child pedals backward and require no hand strength. Hand brakes require squeezing the handlebar levers and need stronger grip. For young learners, coaster brakes are safer and easier. Hand brakes are better practice for adult bikes but require more strength and coordination.

Should I buy a used training wheel bike?

Used bikes save money if the frame has no rust, the brakes work, and the training wheels are not cracked. Check that the seat adjusts to the right height for your child and that all bolts are tight. Avoid bikes with bent wheels or damaged frames, as repairs can cost more than a new bike.