I bought too soon, you don't buy this for a seven year old, her sister, ten is just about grasping the balance issue. Even though little ones don't have to far to the ground, a tad dangerous.

This unicycle is great for the price. The seat does sit a little high, but we took a hack saw to the post to shorten it and now it's perfect. Good quality, my son has loved this!

After the 20" unicycle I bought for her was too big, I bought this for my 9-year old daughter. But because of the way this product is designed, with a closed seat tube that doesn't allow the stem to go down far enough, the minimum saddle height was ~27". Given that my daughter's leg length with shoes on is 24", this was still way too large.

From my research I have come to learn that wheel size is not a good predictor of suitable size--minimum seat height is what really matters. So if a product doesn't give you that information, look elsewhere! Also, a unicycle with a 20" wheel is about as small as a new rider would want to go anyway. Wheels under 20" make going slow more difficult and maximum speed is too limited. A 16" wheel would only be appropriate if that was the only way to make a unicycle short enough, as for a very small child. Unicycles with 20" wheels can be found with 25" minimum seat heights.