Help diagnosing knocking sound



  • @biell 2400 miles on factory bearings? I thought I heard in a video that it’s probably a good idea to at least check them and possible replace every 1,000-1,500 miles. I hope that’s all that’s wrong and you get those ceramic hybrids in. Let us know how they work out.



  • The bearings and the bearing pull kit arrived today. I couldn't wait to get help, so I installed them myself.

    The new bearings are installed and feel like floating on air. So far, no knocking sound, so that must have been it. The best way to describe the sound is that it was like to sides of a snap knocking into each other; in fact, that is what I thought it was at first. There was definitely some noticeable contact on the magnets lining the hub.

    Hopefully I have the bearings in perfectly and they last for a while. I ride about 2K miles per year, so maybe I will have to make changing the bearings part of yearly maintenance. I don't look forward to doing this again. The bearings attached to the hub went in really easily, the bearings on the plate kept wanting to skew.

    The O ring on the plate side was completely missing, I used the teflon tape trick to make a new one. The other O ring looked in good shape.

    The Burris bearings are expensive, at $64 for the pair, but they do feel great. I am hoping they give me some extra range back. I had figured that the loss in range was due to the over 500 battery cycles I had put it through, but maybe it was a combination of factors. The old bearings do not spin on their own, and it takes some force to get them to move at all. That being said, apparently 2,400 miles is a good run. The bearings which were in the OneWheel were NTN 6907LU, in case anyone wants to compare with what came with theirs.



  • @biell said in Help diagnosing knocking sound:

    NTN 6907LU

    That's awesome to hear! Glad it worked out so quickly. About the bearings and price... $64 is not too bad at all. The replacement ones I was looking at are ~$100 total.

    How did your axle look?



  • @skyman88 the axle looked great, apart from the one missing O ring. No scratches, rubbing, or other wear marks to be found.

    I don't drop from higher than about a foot. At 43, I don't heal as fast as I used to. So, my general rule of thumb is to only do things which I feel like I will land 99 times out of 100. That being said, I ride off-road a lot, and there are a lot of very rocky, bumpy trails around here. I am not sure how much that all contributes to axle wear and tear.

    Delaware is going to be covered in slush for the next few days, so it will be a few days before I can put it through a good series of tests.

    That is good to hear about the price. Burris usually provides a good product for a good price. I realized after I submitted my post that I spent the same amount on my tire, and the bearing are just as important as the tire.



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  • @biell Could you please provide a link to the bearings you bought? Would be much appreciated.



  • @Khayman I bought the Burris Onewheel Ceramic Hybrid Bearing.

    https://burrisracing.com/shop/?route=product%2Fproduct&path=3000_24014&product_id=634

    Since the install I have had no issues. It is hard to tell with the fluctuating temperatures, but I believe I have a small amount of extra range. Also, the OneWheel feels like it wants to go faster now, when I am riding it. I don't know how to explain it other than that. It probably has to do with the new bearings being so smooth, there is less resistance.



  • @biell awsome! Thanks.
    Was it hard to install?



  • @Khayman I would recommend watching this video multiple times, I probably watched it 4 times before the change, then actually watched it during my change, pausing when I was going too slow to keep up. Don't try to keep up, just pause it.

    https://www.youtube.com/watch?v=EsT58TsiuLM

    Along with the bearings, I also bought a bearing pull kit, one with 1mm increments so I was guaranteed to have the exact right sizes.

    If changing your bearings is not an emergency, then look hard to find someone with a proper press. I cannot stress enough how important this is. I was unwilling to ride my OneWheel because of the sound; I didn't know if I was destroying it from the inside. In my life, this constituted an emergency, and I made due with the bearing pull kit and what I had around my house. All of my stress for the change came when setting the bearings. My hope is to never go through that again and change the bearings before I start experiencing any issues.

    If you have changed the tire before (I have done so twice now) it is only incrementally harder to add the additional work to disassemble and reassemble the motor. The really "hard" part is probably less hard, and more nerve racking if you don't have the skill. As I described earlier, it is setting the new bearings in place. After that, the next hardest part for me was getting the silver screws off of the axle, my allen wrench was bending a lot, because they were so tight. I was becoming afraid it would break and was just about to go get my safety goggles and gloves when it finally budged.

    Watch the video, and, if possible, find someone who has changed bearing before to help you. Then, it isn't so bad.



  • @biell thank you so much for the explanation, I don't have any problems yet but I feel that it's soon time.
    Maybe I can get one more summer from it and change tire and bearings when winter is coming again.


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