Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Is it work on 20" bike? what is the largest size bike it can work?
Document: This device was delivered as stated and the instructions were clear and concise. I am teaching someone a little older than normally learning to ride a bike. I have a 20&#34; bike and attempted training wheels, but they could not support the bike and rider. This device is excellent.
I'm sure he was 80% there already. These handles helped him get past that last 20%. He is so proud of himself and now asks to ride every day.I removed the handle and put it on my second son's bike-- this handle is built to last. The handle is very strong, and feels similar to the aluminum used on Razor scooters.
I would have probably given this thing 4 stars, but it helped me teach my son to ride his bike on his own in less than 15 minutes. That alone is worth more than 5 stars in my book. It's decently made and easy to install.In terms of use, my suggestion is to not get ahead of yourself...  Keep your hands on the bars and just push your child around an open parking lot for 15 - 20 minutes.
Bought this trainer based on  the design and concept.I have never seen a trainer such as this before, all I know is old school training wheels...product is made out of aluminum and is very well designed and constructed. Assembly was straight forward, just need to to be a little mechanically inclined. Took my son out to try it and after 20 minutes he started to get the feel for balancing the bike. He feels more confident and is willing to keep at it.
A great purchase. Well worth the money and much better then a $20 handle that I bought for my smaller children. Very glad I bought this. Balance training handles are *much* better then training wheels.Our 8 year old son has balance issues and sensory integration issues, to the point that he visits an occupational therapist.
We have a child with needs. This handle was easy to install and very sturdy. She's happy because she gets to ride her bike and feel independent.
this is so awesome my son learned bike riding within 2-3 hours and now he doesn't want to come inside. :)we all love it.
Well made product for once. Easy to assemble and much easier to teach kid to ride bike. Very adjustable. We'll use this for years.
If you are teaching a child how to ride a bike this is the right way to do it. Gives them the piece of mind that you are there if you need to. Even better it gives you so much more control
My son is very scared of getting on his bike and I am short so it was really hard for me before we had the balance bar. It is incredible and he feels more secure each time her gets on his bike.
Answer: no