These training wheels fit most childrens' bikes with 16" or 20" wheels.
The brace arms are designed to fit rear frame tubes up to 3/4" inches in diameter. The maximum rider weight for these training wheels is 100 pounds.
These wheels may not be compatible with a bike with a rear derailleur. Instead, see Sunlite Adjustable Bike Training Wheels.
If you haven't yet bought a bike for your child, consider a Strider Child Balance Bike and leapfrog over the training wheel phase.
Contact us for warranty details on this product.