Adjustable bike training wheel set for 12 to 20 inch bikes Key benefits Provides stable balance during initial riding and helps children learn to pedal and steer with confidence. Adjustable design supports multiple wheel sizes from 12 to 20 inches, allowing a single set to fit growing bikes. Easy to assemble, enabling quick setup and minimal downtime between bikes or riders. Includes two training wheels to install on both sides for balanced support and safety. Compatibility and size Wheel size range: 12'/14'/16'/18'/20' bikes. Bracket size: 21 x 7.5 x 2.9 cm (8.3 x 3 x 1.14 inches). Wheel quantity: 2 pcs per package. What's in the package 2 training wheels designed for 12/14/16/18/20 inch bikes Brackets and mounting components suitable for easy installation Performance and use The adjustable mechanism allows quick size changes to match the bike as the rider grows, maintaining stable guidance during early rides. Suitable for use on bikes of commonly used kid sizes, enabling consistent training across different models. Use scenarios Scenario 1: A child uses the training wheels on a 12–14 inch bike during initial riding lessons to build balance and confidence. Scenario 2: A family with multiple bikes can grow the training wheels with the child as their bike size increases from 12 to 20 inches, minimizing the need for wheels. Scenario 3: Replacing worn or damaged training wheels on an 18–,20 inch bike to restore balance and continue safe practice without a system.