Training Wheels for 12 inch to 20 inch bicycles Help your young ones learn to ride safely by installing Training Wheels on their two-wheelers. The training wheels are carefully crafted for easy installation and excellent reliability. Plus, they roll super smoothly, too. Thanks to 4 1/2-inch diameter wheels with hard-rubber tires. The Training Wheels fit children's bicycles sized 12" to 20" so you can move them from bike to bike as your kids grow, too. Place of made: Taiwan Warranty: 1 year