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Wheel Size: 20 inches. This is the most common size for this specific frame geometry and "Fat Bike" tire style.
Frame Size: Approximately 11 to 13 inches (Small).
Rider Height: This bike is designed for kids or young teens, typically between 4'0" and 5'0" (120cm – 150cm) tall.
How to Verify the Exact Size
If you have the bike with you, you can confirm these measurements easily:
Check the Tire Sidewall: Look for numbers molded into the rubber of the tire. It will likely say something like 20 x 4.0 (where 20 is the diameter and 4.0 is the width).
Measure the Seat Tube: Measure from the center of the crank (where the pedals attach) to the top of the tube where the seat post enters.
Note: Because this is a "Fat Bike" (with very wide tires), it will feel slightly taller and heavier than