Note: Only one extension bolt is installed on the side of the variable-speed bike wheel.
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Product Details: • Wheel diameter: approximately 5 1/3 inches, with a metal bracket thickness of 0.138 inches for improved stability and safety. • This heavy-duty rear training wheel stabilizer set helps young riders learn to ride a bike until they develop proper balance. • Suitable for 16 to 24-inch bikes (except HUFFY brand). Includes accessories, easy to install, and individually adjustable support brackets. • Compatible with single-speed and multi-speed bicycles. Supports riders up to 100 lbs.