Installed them on my son's new 20 inch bike. They look like rollerblade wheels and I have to say I like them a lot better than the standard plastic ones. They are quiet and roll smoothly. I'm not that big of a fan of the mount that attaches to the back of the bike, but it seems to get the job done and hold the wheels in place once installed. In general, I have to say that I am satisfied. UPDATE: While we were riding tonight, my son mentioned that his bike was difficult to pedal. We noticed that his right wheel started to wobble a bit and showed excessive wear. We stopped so I could check out the bike and the nut. At this point we were almost home, so we thought we'd move on to the next block and take a closer look at the house. Shortly after we were back on the road, the wheel suddenly came off and my son ended up falling off his bike. Luckily he wasn't hurt. The wheel bearing just fell apart, the nut is still tight and secure. While I still love these types of wheels, I now have doubts about the quality of the bearings. If we decide to try this type of wheel again, I'll probably consider adding a large flat washer to the outside of the wheel so it will stay in place if the bearing falls apart again. UPDATE #2: I tried contacting the seller to inquire about the impeller warranty. They responded quickly and kindly offered to send a new set.
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