These are not direct from MBS they are for MBS wheels from two different sources.
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Im 99% certain its 22.2mm as well.
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why does it have to be 22.2 
funky funky
28x8 bearings exists, so if you have the axle length you can still run these
You could make the pulley locate on the non-threaded holes in the pattern, rather than locating on that single thin lip around the bearing seat. Just a few pegs a couple mm long would allow it to locate firmly while it is bolted in place. Has the added benefit of potential taking some of the load off the screws if the fitment is tight enough.
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tbf, most production boards will not have the axle length to do this. Admittedly, there is another way, if you have 10-8 step axles, xcell sells a 12mm axle sleeve which will give you the required length, but it’s not cheap.
Hmm, so the only risk is the axles themselves snapping from being too weak. Any other options? Does these run ‘‘standart axles’’?
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Standard axles unfortunetly no, as those aren’t wide enough. Boardnamics and 3ds hangers / axles should be wide enough to run these. edit: i think bn axles are 50mm and 3ds is 51mm.
The bearing code to fit these to 8mm axles is 638. These are a mm wider than standard 8mm wide bearings, so instead of the standard 38.2 axle spacing you need 40.2mm. Worst case scenario you need to flip axle the nut so the nylock is on the inside, but you can probably get away without doing that on most axles that can take these wheels.
I don’t think you are more likely to snap or bend an axle using these than you are while using any thane wheels.
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By chance, is the thread pitch selected for the four threaded holes finalized yet? I’m developing my own pulleys compatible with the kegel interface from BN pulleys, and my own BRP wheel hubs for my custom board and i would like to ensure compatibility with the SR125 wheels haha.
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Yes those are exact. 5.6mm holes for 5.5mm dowel pins, the same size pins BN uses. The original Kegel cores are tapered to the center of the hub from both sides and vary in tolerance. We’ve found 5.5mm pins are a tight fit in the Mad 105’s. The 5.6mm hole is basically the machined equivalent of Kegel diameter.
Threads are standard M4 x 0.7 pitch. 10mm thread depth but its a through hole so you can use long screws to make sure its fully engaged.
Hurts my OCD bad but you guys are right and that’s why this forum is awesome because otherwise our wheels with hopes for a new standard would have had a unique non standard spacer width apparently but I’ve changed it to 22.2mm now.
Who even uses standard trucks anymore… I remember having to grind off a portion of my Paris V2 hangar back in 2017 to make the Enertion wheel pulley fit. Now we’ve got standard-ish eskate trucks with axles in the 48-52mm range.
This is another clever suggestion, but it would increase the cost of the pulleys. I’m thinking we’ll proceed with the small lip for now, and if it does turn out to be an issue we can always do something like what you’ve mentioned to fix it with the pulley design instead of anyone needing to buy new wheels.
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We’re working with @Boardnamics at the moment to get a batch of BN M1 drive adapters made to fit these wheels. Hoping we can have them in stock by the time the wheels are ready to ship.
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Just had this idea to add an extra seat for a 26mm bearing on the outer side. Requires a custom 14.2mm bearing spacer but it means 8mm less axle length is needed if using a 26mm outer bearing instead of 28mm. After discovering that the pulley bolts interfere with the Matrix 3 hangar on the short axles this would be needed for some boards.
12x26 bearings are non standard but seem to be fairly common and not too expensive so I’ll see if we can stock them and the shorter spacers to give people more options. Once again open to feedback.
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Maybe bring the 26mm seat in a little closer so that you can use a standard 10mm spacer?
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But with using the 26mm seat the wheel is already quite offset compared to the bearings.
On very offset wide hubs, I can wear out a 6001 bearing in the inner bearing seat quite fast already. I am yet to try 3001 but I have high hopes that would eliminate my wear issues completely.
Maybe if you bring it in by another 4.2mm and add 4mm extra bearing engagement to the inner seat to be able to use 3001 double row angular bearings, that would solve the sideloads wearing out the inner bearing, while allowing a standard 10mm spacer. 3001 is more expensive than 6001 though. The cheapest branded ones go for like 6-7€ per piece, NSK, SKF and such substantially more. Just another consideration.
This 3001 bearing support would make the standard much better for larger and especially wider wheels in the future
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Why M4 instead of M5 for the threaded holes?
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That’s the trouble. If anything I’d go wider on the spacer like 15.2mm and let the bearing stick out a little.
Expensive double row bearings is not really something I want to make compromises for. Technically you could already use them if you have the axle length since its only 4mm wider. Not ideal but could be fine.
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Why M5 instead of M4? As long as there is sufficient clamping pressure a lot of the load will actually transfer through face-face friction unlike MTB pulleys that require standoffs and also use M4.
M4 also just allows you to remove the bearing without the bolt heads getting in the way, and uhhh it weighs less…
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Yep I can understand that. And probably if it sticks out of the bearing seat a little it’s not gonna cause issues.
I think the question really comes down to if you think the prebuilt market with smaller axles would be interested in such wheels, what their axle length is, and if that’s a target that’s even possible to meet. Thinking of the evolves, exway atlases and such here.
I think if you want to support the smallest possible axle length the only way is double row inner bearing, but even then I am not sure if prebuilts have enough axle length. But also not sure if those exist for axles smaller than 12mm which most of those boards are anyways.
I think I am convinced that the wider you go the better. Just leave the prebuilt market behind, and make the best wheel you can for a 50mm long axle. Just keep in mind the bearings for 8mm axles are a mm wider each compared to 10/12
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