woom 6 Review – Results of our Test Rides. Read more. Imagine the difficulty of a bike that is almost 2/3rd of your body weight. The Woom 4 has an 8-speed drivetrain, with a single 28 tooth chainring up front and an 8 ring cassette in back ranging from 11 teeth to 32 teeth.For the bike geeks out there, that gives the bike a gain ratio between 2.3 and 6.7.. Don’t know what that means? Spare wheel for a woom bike, excludes tube and tire. Sure, the Woom Off may be a mountain bike, but with a rigid carbon fork and a lightweight aluminum frame, the 24” wheeled Woom Off 5 is a sub-19lb bike for kids ages 7-11, or 49-57” tall. It means this: Woom has provided plenty of range both for climbing steep hills and making good speed on flat roads. woom 5 has quick-release clamps on the wheels, so it’s super-easy to take them off to replace a flat tire or something like that. The Frame. All multi-speed bikes have a front and rear quick release skewers making transporting and changing a flat tire a piece of cake. Woom 1 | Balance Bike 12 inch | 1.5-3.5 years First experience on two wheels: The Balance Bike is the perfect introduction to the concept of two wheels. woom 1, 2 and 3 wheels: includes wheel only. woom 4 Tires and Rims. As a hybrid (which is a blend of road and mountain bikes), the woom 6 features smooth rolling tires that easily roll over various terrains, a lightweight 20 lb. 12lb 3oz Lightweight (woom 2) one of the lightest children's bikes in the world riding a much heavier (non-woom) child's bike with training wheels would be like an adult trying to learn to ride a bike by using a heavy moped. Gearing and Shifting (Gain Ratio) The woom 4 has 8 gears ranging from a 2.3 to a 6.7 gain ratio. For added visibility bonus, each tire also has a white reflective strip. Does not include tubes and tires. If your woom bike is older than one year in age, please contact us before purchase to make sure we have the correct wheel model for you. Kids at this age (7 – 11) are known to abuse their bikes a bit more, so it’s important for the bike to be easy to maintain. With a wide range of gears, the woom 4 is ready to tackle hills as well as easily gain speed on flat rides. Styles vary. The Woom Off 5 is built around a 6061 aluminum frame with fully manipulated tubing. woom 4, 5, and 6 … The woom 6 is the perfect hybrid bike for tweens who need a high-quality bike to tackle the neighborhood and the trails.