YL traV Trd Adjustable Bike Training Wheels Bicycle Stabilizers Mounted Kit for 18-20 inch Multi-Geared Bike

Perfect for a gear bike! Strong and easy to install.

The training wheels fit onto a bike for the 6-9yo age group well. Many training wheels will only fit onto younger children's bikes. The nut which allows you to adjust the height of the training wheels is in a tight place and is a bit tricky to access. In the end I did it with some needle nose pliers - it was too tight for a wrench. But this is a minor quibble.

Bought for my 7yr old grandson's "big bike". Easy to install, sturdy, and good enough. Probably won't use them long enough to evaluate how well they hold up. However, for now, they serve their purpose well.

These are god awful. They bent up as soon as my daughter took her first few strides on her 20 inch bike. The metal is very weak and not braced at all.

These worked great for my daughter's Trek MT 220 with 16" wheels. They are adjustable and can probably fit a 20" wheel bike - not sure if they would be able to fit anything larger. My daughter had no interest in learning to ride a bike until she had outgrown traditional, smaller bikes. With theses, she was riding her bike without training wheels after just a couple days. Well worth the purchase.