idk? I got it used. old.
but… the bearings slide onto all the axels individually. it’s only when paired through the hub to the other bearing that the binding is happening. (see vid)
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Oh I missed that, for sure there is something out of center on the hubs, with the hub mounted, spin it with just one bearing on the axle and see if you can spot any wobble on the bearing that is not on the axle
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just for a joke
mic the OD of the MBS truck axles and then the hypertrucks
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I’ve got a pulley bearing stuck on my kahuas. Precision is definitely a two edged sword.
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yup… even a slight “kink” in the axle will send the bliss of precision into the agony of the stuck bearing…
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puzzling them together I have something that’s working. with only one hub giving trouble but it’s workable.
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I luv that you used a spreadsheet for your science
I’d have used goats blood marks on the garage floor
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I still cut notches in my upper arm for tracking things.
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I’m not so committed to the “cutting” thing
I lack commitment…
but you should see the semi-permanent sharpie marks on my hands, at the end of a race
They were a very tight fit. Very.
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| hypertrucks | 11.82mm |
| MBS matrix IIs | 11.75mm ± 0.01 |
so… yeah very small amount of precision is f’n me here. 
so much time wasted.
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if’n ya wanna we can chuck them up and gently un-precision them with some fine grit wet 'n dry… a couple of thou should do the trick
so, my thoughts are the @ZachTetra offered the bestest solution!
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A bearing have to be seating a bit off
Bet thing will be to push bearing out and insert it again, will need an arbor press for this.
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thanks.
that’s the main hypothesis we had. though i lucked out puzzling things together. which suggests maybe it’s something else.
Out of curiosity How would you press it out? the outer race isn’t accessible on that side. do you just push on the inner race and let the bearings take the load to the outer race? got any video of this being done? does that destroy the bearing?
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Have you tried this hub on another axle ?
To get the bearing out push the inner race by using a wrench socket or spacer.
I’ll send you a couple of bearings to use as replacement, let me have your order number.
The using the arbor press is pretty straightforward
See here
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those numbers sound very wrong…?
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FatBoy 320 axles are 11.94mm 
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Indeed , Hypertrucks should be between 11.97 to 11.98 mm
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Fair. I’m using $20 digital Calipers. never did any kind of calibration though. I thought I zeroed them properly I can try again. concerned they’d be that far off. they state they are ±0.02 accuracy.
the relative diff should be the same though.
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right. after mixing and matching the front and rear hubs I ended up with 3 hub sets that fit pretty good. and one that was manageable. ie it fit and removed with a bit of persuasion. the good ones fit on all four axels. the tough one is tough on all four axels.
The interesting bit is that certain combos worked. (green) others didn’t. and I can’t pick out that one or two bearings are seated poorly from that data.