Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Does the rear brake have sufficient stopping power for downhill riding?
Document: My son has been riding hard now for over a month now and the bike is going strong. I will try to update this in about a year whenever we reach the 30,000 mile mark :-)
The bike seems to be well built and was easy to assemble. My 8 year old grandson was very excited and quickly adapted to the hand brake. Overall a very good purchase.
I am not sure if it happened in shipping, but that was disappointing. Good news - our son LOVES it! The frame is small enough that is it s nice transition from his 18&#34; bike and the tires are the right size to grow into. He liked the simple, smaller framed bikes without the hassle of gears. He's been riding pretty much non-stop since he's been home!
rides fine; it's just a crappy quality.I took off all of the stickers and the neon green handlebar grips so that the body is completely black and the handlebar is completely grey. It is a pretty good looking bike, I must say. Also a part of the handlebar was missing paint.
arrived on time and was as advertised. Easy to assemble. Tires seem a bit on the thin side. Price was in line with similar bikes.
Today is January 2, 2014....still no part. NOT A HAPPY CUSTOMER! Hope to see the part in the mail next week....maybe we wont have 6 inches of snow on the ground then....
This was a surprise for my 10 yr. old son returning from camp. We received it and assembled it while he was gone. Overall - we love the bike,  and but when we first assembled it the frame wasn't sitting straight with the tires and the brakes wouldn't line up right. After two days of monkeying with it, we took it to a local bike shop and they fixed it for us.
This is not the bike I would have chosen for my son but he absolutely loves it! He saw this model on Amazon and instantly said he would prefer it over the bulky 10-speed mountains or squat BMX bikes I was looking at. Apparently, 'freestyle' is in with all the hip 9-year-olds. Well, we  wern't disappointed. The bike arrived quickly (thanks to Amazon.com's super-sneaky shipping elves) and was very easy to put together.
This bike had so many problems I do not even know where to begin, steering problems, chain popped off, I ended up giving it away to someone for scrap because it was broken more than it was fixed! My son was so disappointed. I would not recommend this bike.
There is no problem with ride my new bike so i enjoys it since few week ago thank you very much !
Answer: no