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: Are hubs sealed cartridge bearings?
Document: They are also very heavy.
These wheels fit that bill. I search the internet for a long time looking for the best fit for my needs. I am very pleased with them I didnt give the 5 stars cause i spent some time truing them.
The wheels arrived on time. and they are nice a straight, tried them a couple of times in the trails and they are smooth. The cassette have a nice click to it and replacing the tires is much easier than with my stock wheels.
Rims were not trued well. I was able to repair that myself with a spoke wrench. The rims are great looking and very stiff. They were lighter than the thinner originals on my 2005 Giant Sedona DX comfort bike. Great price and performance. My original freehub and was going bad and my local bike shop said I needed heavier duty wheels since I tore up my cassette and chain doing some light to medium offroading. The bike now feels so much more solid and tracks better through the rough stuff.
Just put these on my bike the other day and haven't had a chance to ride on them yet, but the one thing that stuck out was the shoddy seam, particularly on the inside portion of the rim. You can totally see where the rim comes together and there doesn't appear to be any sort of a weld on the inside. I realize that these are cheap rims, but I am concerned that these aren't going to hold up very well.
I have been riding on these for a while now. They are great! They seem plenty strong as I abuse them to the fullest and have yet to even scratch the paint, let alone bend them. One thing you don't notice in the picture is that they are built for Disc or V Brakes, so the sides are not white, they are shiny braking surface. They are still good looking wheel. The front hub seems just slightly too wide for my Marzocchi 44 TST2 Air fork.
Good rims just need to make sure spokes are tightened and make sure true and dished... either take to local bike shop or if your like me do it your self.. bottom line if your a budget mountain biker theses are good to go.. gone on a few hard rides still running strong. Now if you can afford more expensive than go get better stop looking at small priced..
Answer: no