Just look for Silicon Nitride Si3N4 and youre good. They are for high heat envirinments
Your hubs would melt long before the bearings are damaged by heat… Would look into why there is so much bearing friction if heat is being generated in that amount
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secondary failure mode, ignore
i doubt it is bruising/pitting from contamination because it is so localized.
i think it could be brinelling from excessive impact load (eg jumping off a curb).
i think it is more likely to be manufacturing defect. i’m not expecting much qc on inexpensive bearings
this channel is a gold mine
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@MoeStooge what are your thoughts on bearings for esk8? AFAIK 3 link trucks are using 10mm axles? Have you managed to find some quality 10mm ID bearings or do you mostly treat them as purely consumable? How often do you tend to swap out? Any thoughts on 8mm bearing sources/suppliers?
p.s. can I buy a hat?
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My house boards I use a 30x10x9 GMB steel. Bearing failure happens but it shouldn’t be a regular thing.
Our AT wheels we just started using use a 28x10x8 steel. Check the 30mm before every run, haven’t replaced one as of yet.
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@MoeStooge would you share the manufacturer and distributor associated with the 28x10x8 bearings you use?
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I’ve recently found out that misumi are probably the cheapest place to buy your bearings from (from a reputable supplier)
Deffo going to buy a bunch like a nerd.
$12.5 shipped for 10x NSK 608s
$5.5 shipped for my gear drive bearings
And then I’ll probably buy some 6001 and 16100 bearings
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This dude is a legend. He’s the British version of Engineering Explained. Thanks for this Moon! Conclusion of th video : only get metal cages in bearings, avoid plastic cages, avoid China bearings. Gonna keep a look out for your recommends now…
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I couldn’t tell you much about the 28x10mm. Standard Metroboard x stuff. Not enough time on them to tell.
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Do you have a link for this? I tried searching the site myself and I couldn’t find the 608s.
https://uk.misumi-ec.com/vona2/mech/M0800000000/M0802000000/M0802010000/
I should have noted that you have to be a business to order from them and my pricing was based on Misumi China
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I see. Well, I know that @mackann will be using NSK bearings for the 2020 setup, so maybe I’ll just order some from him when I need them haha 
thanks for the info!!
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They’ve arrived! Can’t wait to hear about the feeling you get from usage.
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Q: are they pre-greased and using metal cages?
I have some presassembled manual Rivera longboard that came with “Abec-5” bearings that have absolutely no lubricant in them…They free-roll as good as ceramics ones without load (just the wheel). But the flexy deck when rode on has too much drag (compared to other stiffer decks). I’m wondering if this drag is caused by the flexy deck or the bearings having no lubricant in them. Switching wheels to a stiff deck to find out more…
update : in the overall scheme of things, bearings don’t really affect the free-roll as much as the design of the wheels themselves. I’ve tried all sorts of configurations -
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have tried the bearings without lubricant and with lubricant. with the right lubricant (lithium grease or detergent based), they run smoother.
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have tried with different decks. flexy decks definitely have a little more drag than stiff decks
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have tried with different wheels, same bearings. for some reason, same duro rating but different wheels change the level of drag.
conclusions : the biggest effect on drag is truly the wheel (cannot at this stage determine which part of the wheel affects it the most though: whether it is the core or the wheel material itself. this was between the same brand of wheel but different model.
Non contact rubber seal
How are you testing free roll
So the cages are still plastic?
For the testing - it’s very rough, but single push manual decks and distance travelled.
bearings are generally of the same standard, different brands and some ceramics (I have no metal-caged ones). Some spin (without wheel weight) more freely than others for a longer rate, but throw them into a deck and ride them and the drag will be severely affected by the wheel (after changing the wheels numerous times).
Basically using the same bearings and changing the wheel will affect the free roll distance. Then swapping the bearings for the so called better bearings on the bad wheels. The bad wheels will end up just as bad.
Cages should be metal
Try some speed vents for free roll
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There’s not many options out there but they are around. And expensive.
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