The type of plastic use in this core can deform with pressure and temperatures. I don’t think is mass problem. Is maybe small problem for less than 1% of core make. This material look like ABS or PC/ABS. Is quite strong.
But core is thin for design and can warping under pressure. I think is no need to worrying so much. Wheel can be ok still.
I’m not set on it being user error. Just trying to inform that this isn’t a unseen thing in skateboarding. I’ve seen multiple different wheels do it.
104kg. 230 lbs.
Update for transparency.
I am feeling ok today. Butt is pretty sore. But not horrible. I expect to go on a couple rides today.
I had emailed Iwonder:
1-they responded immediately.
2-they asked for order details to identify the wheel batch timing.
3- they asked me to ship the wheel back.
4- they offered to send me a new set.
So pretty good response from them.
@BluPenguin.
So dude do you get it now that the way I put these wheels on is fine?
I like to keep my wheels spaced out. These are TB 218s
So I have a couple of speed rings. One of those infamous bearing spacers.
Then Zealous bearings with built in spacers.
Then the axle nut.
I like I have all my years skateboarding I tightened the axle nut down and then backed a half a turn so the wheel spins freely.
I can’t see that I could/should have done anything different here.
Yeah, sorry you got second-guessed here. I think everyone was just scrambling to figure things out and let people know of a potential issue.
Apologies on behalf of the thread.
Hope you will fully recover soon! Seems like they really want to find out what happened and will compensate you aswell, good response indeed. Wonder if they will actually find any abnormalities 
Sounds as tho thay care to investigate how it happened, if it’s a one off and if there’s a way to possibly avoid it. Exspecaly like thay sending a hole new set not just 1 wheel so you don’t have uneven we’re on them/ avoids any other failing if it was a faulty batch. 
from me even if the outcome is unsertan it shows thay care about maintaining a quality product. 
could work quite well with my latest build.
It could be as simple as a bit of dirt in a bearing. Would be worth popping of the seal and cleaning them out.
Thank for clearing that up, it seems apparent that you know what you’re doing with a spacer and would not have gorilla’d that down if there was a loose spacer jingle in the core.
So leaves us with one or combination of
If your wheel spacers are perfect, you should be able to tighten the wheel really hard and it should still spin freely. If you needed to back it up in order for it to spin, there is at least some play which can cause issues. Perhaps that combined with a poor quality batch could cause the issues
Posted this exactly a week ago. I’m definitely on the fence about riding these wheels now after seeing a full blow out of a core.
I was thinking maybe you could glue in a press fit pulley for strength. Then Changing bearings would be impossible unfortunately.
Maybe there would be a way around it. Like if you used haggy pulleys I think you could still get the wheel bearings out through the hole in the pulley.
Here is a little image analysis. There is some sort of optical illusion happening that lead many to initally conclude that there was no room for a spacer. The shadows make the bearings look larger and the gap look smaller. However, it is an illusion and both pictures consistenlty show that the bearing spacers were not missing.
I thought it was important to do this because in one way or another many of us expressed some doubts. @rafaelinmissouri is definitely being on the level.
So with that, I’m going to re-iterate my thoughts on the product appearing to be unsafe to use. The manufacturer stated that they had several of these failures (but as a low percentage). These wheels have not been out there that long. So the failures seem to be happening in the first year of use, maybe less. So the failure rate is only low up until this point. That should not instill high confidence. Failure rates typically increase over time.
We have a second example courtesy of @Jpm5150 . His picture shows large cracks propagating around the core. Clearly these cracks would end in the same type of failure as was experienced by @rafaelinmissouri .
If Toyota had just one or two instances of metal fatigue on a critical component or wheels falling off, they would do a safety recall. Other manufacturers would wait until some customers died.
So given that this type of wheel failure is not an isolated incident and that the product could seriously injure or kill you, What are you going to do. Is your confidence really warranted when the manufacturer effectively says “don’t worry, its only happened a few times so far”
Thankyou to @rafaelinmissouri and @Jpm5150 for alerting the community.
Unfortunately, car tyre companies or sport rim companies dont do recalls - you are dealing with roughly the same kind of parallel, caveat emptor, free market approach. Only a boosted or metroboard or evolve would do a recall… but then again… are there even dealerships to cater for that?
@rafaelinmissouri what was the batch number of your wheels. Its lasered in on the inside of the wheel if anyone wants to check theres.
Mine is 1900ch08002.
@rafaelinmissouri and @Jpm5150 can you describe the time to failure? Number of months in use? Number of miles ridden? Do you ride all year or were these idle during the winter? What temperatures do you ride in?
Can you send a picture to show where? I don’t see it
