Idk how you’re getting that out of what I said, I’m not proposing anything like hollow wheels.
I also own a set of those hollow wheels, the pro version. I support Doug’s journey and think they’re a great wheel.
1 Like
Wait are cores actually smooth on the outside?
I expected T-shaped anchors into the urethane to mechanically lock them together instead of solely relying on a chemical bond.
Not smooth but ribbed I think
1 Like
The abec cores already have something that performs this function, but is designed differently than that sketch.
Yes, kegel (Orangatang, TB, etc) cores don’t have a raceway and it’s why they can spin out.
No, abec (ABEC11, Zoobomb, etc) cores have a raceway around them, and would have to dismember the wheel from the inside to spin out.
I couldn’t find a photo of the ABEC11 core, but this scooter wheel has a similar raceway around the core as the abec cores have.
9 Likes
So this is why abec has something over Kegel… Huh
…WTF sk8 industry wtf r u doing
Well the abec cores have thin and tiny spokes that seem really weak, thin bearing seats, and funky shaped holes, so each core has pros and cons. Round holes (like in the kegel core) are easy to drill, easy to CAD, and easy to fill with bolts or pins. And the bearing seats on kegel are nice and THICC. The abec spoke hole shape doesn’t seem to make a lot of sense for esk8, maybe for downhill longboarding. But yeah the raceway on the outside of the abec core is dope.
Neither of these longboard wheel cores seem designed for esk8 use first and foremost.
3 Likes
You’d think something like the TB110 would though, standardization only makes sense when it… Makes sense to do it that way.
1 Like
Whether a core is kegel or ABEC is not that big of an issue. The mechanical locking of the urethane is the key to preventing delamination and is not hard to do. Just need a good core design (Not the TB110).
I want to make the core bigger for three reasons.
Cost
Weight
Contact area between core/urethane
The cost of urethane is getting really high. The more plastic that is used, the cheaper the overall cost of the wheel will be.
Urethane is heavy as hell. 900g like the TB130 is just waaaay to heavy. The right amount of urethane to allow for grip and cushion is all you need. Trampa really missed the boat on this one.
A larger core will result in way more contact area between the core and urethane. As long as the design allows for mechanical locking of the urethane, you should not have serious issues with delaminating.
4 Likes
I agree. All cores should just be Kegel with anchors or a raceway. Do away with abec.
Kegel mating pins don’t leave enough room for bigger bearings. As much as I like standards, we probably need a new core. Abec and kegel styles both have serious issues. Also one that’s licensed in a way that anyone may use it. And is designed for torque transfer.
7 Likes
That is one issue. I really don’t care for the 6900 series bearings for 10mm axles. They just don’t seem to last very long. A new core/pulley design will probably be needed in the future. Anyone up for designing one?
1 Like
I could design a modified kegel core pretty easily. Just let me know how wide you want the core to be, how much offset (if at all) you want the bearing seat to be, and what diameter you want the core.
Also, if theres enough demand for it, and someones willing to produce new pulleys, modifying the hole positions outwards to accomodate larger 28mm OD bearings would be pretty trivial too.
2 Likes
It could also be an interesting feature if there were two large bearing seats and maybe between them a smaller bearing seat in case someone had one of the notorious axle-too-short problems, they could run a smaller bearing in lieu of an axle nut held on by 1 thread.
6 Likes
One of the issues is we are using 8mm and 10mm axles for urethane wheels. Are there 28mm OD bearings that work with 8mm axles?
Theres axle sleeving kits that adapt 8mm axles to 12mm axles - i own a set and actually use them all the time to run wide pneumatic hubs. Xcell makes them. It solves both the diameter issue and axle length issue.
It also looks like 638 size bearings are exactly what youre looking for, if you’re not worried about the axle length difference.
1 Like
A 28mm bearing seat would work for 8mm (638ZZ) and 12mm (6001ZZ) axles, but would need a shim for 10mm axles (6000ZZ) ( 
)
The only size seat that has standard bearing sizes for 8mm and 10mm bores, is 22mm. And that isn’t compatible with 12mm axles.
2 Likes
What do you mean by needing a shim for 10mm axles? I have hubs with a 28mm seat that ive run both 12mm and 10mm bearings in without issues. Yes, the 10mm bearings are narrower, but it doesnt really matter unless a 2mm difference in offset is going to give you issues (it shouldnt)
What bearings have a 10mm bore and a 28mm seat?
- 28mm OD, 10mm ID, and it turns out the width is actually the same so i was mistaken there.
1 Like
That’s perfect then. 28mm x 9mm bearing seat would work for all three axle sizes.