SIZE OPTIONS: 20" wheel for rider height range 4'8" - 5'4",, 24" wheel for rider height range 4'11" - 5'9", 26" wheel for rider height range 5' 3" - 6'2" 7-SPEED TRICYCLE: Our 3 wheel bikes for adults is perfect for those who want to enjoy the outdoor life. It features a 7-speed drivetrain, front linear pull brake and rear extension brake to create a fun riding experience for you PRACTICAL THREE WHEEL BICYCLE: The tricycle is made of high-quality iron and can support a total weight of 350 pounds for the rider and cargo. In addition to the practicality of the tricycle, the tricycle design ensures safe and stable driving, and the frame will remain strong and stable EASY TO INSTALL--We have detailed installation instructions in the package, also have product installation videos on the display page, which can provide you with reference help during installation SATISFACTION GUARANTEE: No matter what reason you are not satisfied with our products, we will provide you with a good solution and the best service. Welcome to contact us through Amazon message, we will solve the problem for you in time