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

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.

Perfect custom fit for child's bike 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.

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.

Training wheels were easy to put onto bike. Fit perfect. Works great.

Easy to put on and is sturdy

Dangerous. The bike is a 20 inch boys bike. With in the first 1/4 ride the wheels did not stay in place scratched up the paint badly. This happen 3 times in the 1/4 mile trying to back home at this point. Absolutely horrible and Dangerous and damaged a brand new bike and worse of all I watched my son fall 3 times luckly unhurt and it's cuz of this junk product. Dooo not buy

The idea of an extender nut to get past the derailleur is an excellent idea. However, trying to put it on was more than hard. My hand still hurts an hour after trying using thick leather work gloves. Got it almost all the way on but not quite so took it off with great difficulty. I thought it might be the wrong size nut or that I put it on at a bad angle. but when I took it back off nothing was stripped and the original bike nut went back on with ease. My bike uses metric tools and so too do these training wheels. They provided two extender nuts but both did the same thing and I didn't go very far with the second nut. Perhaps the extender nut was supposed to act like a lock washer but if so it would have been better to provide a lock washer instead. Back to Amazon it goes.