So a while ago I got a urc M4O frame, and today when I tried to put it on a uni I was building, one of the frame bracket parts did not fit on the bearing. I tried both bearings, and two hubs, but it won’t go on. The parts of my other urc frame fits easily, and so does the other bracket. What should I do?
Is there paint on the inside where the bearing fits into the bearing cap? If so, maybe you can scrape off the paint so the bearing will fit in.
I don’t think think the paint it doing anything, it’s just a normal thin layer. The metal is probably just bent
It looks like the bottom bracket in your photo may have been made for a 40mm bearing. I am assuming you have 42mm bearing on that hub. Could this be the case?
Have you measured the difference in mm between your “old/current” urc bottom bracket, and your “new” urc bottom bracket?
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Well, the frame fits and so does the other piece, so I’m pretty sure that the frame is meant to fit 42mm
Yes, but is the bottom bracket the correct one for the frame? I don’t know how the M4O warehouse is set up, and whether frames and bottom brackets are held in different “bins”. I’m just wondering if 40mm bottom brackets were matched with a 42mm-bearing frame. Could that be a thing? That’s why I was asking about measuring the bottom brackets.
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M4O sell cotterless URCs so it’s absolutely possible there’s been a mix up somewhere in the supply chain especially as the 2 are incredibly similar looking. On the other hand, it could also just be a defective part. Really that isn’t for you to need to puzzle out.
Regardless of the issue, drop an email to whoever it was bought from with the order reference, description of the issue and photos from the thread and ask if they can send out a replacement. I don’t know about US sales legislation but niche retail works on customer goodwill and they should make it right for you.
I bought it from mad 4 one and never really took it out of the package until now. But I also got it a long time ago so I don’t know if they can do anything
Just checked - If you were in Italy where M4O is based you would have a minimum 2 year guarantee against product fault from delivery with a 1 year reverse burden of proof (the vendor is responsible for proving a product isn’t faulty at time of delivery rather than you proving it is).
As you’re in the US, you probably aren’t protected by this legislation but I would still expect them to make good.
This is their warranty page with instructions (i’d doubt this would be considered a “visible defect”) https://www.mad4one.com/gb/content/55-warranty
My first, reaction. Weird.
However, it’s obvious.
The “depth” geometry are different.
Throw that shit bracket away.
…slam
solution:
1.) Do you have a bridgeport milling machine and/or lathe? Probably not. Continue reading.
2.) Find a friend that has a “quality” 3d printer that can print ASA plastic with glass fiber composite. To replicate the correct sizing bearing bracket. Hopefully, he/she has solidworks and a Bambu Lab P2S printer.
3.) Figure out “exact size” steel “spacer” to carry the load.
4.) Proper “lock nut” or red loctite to prevent unscrewing.
good luck…slam
As suggested by others I‘d figure out if the shell was made for 40mm bearings. If it is, get a replacement. If it seems to be made for 42mm bearings I‘d put it in a vice to try and flatten it bit. This would at the same time widen the opening a bit; hopefully enough for the bearing to fit.
The shell is definitely made for 42mm bearings. The thing won’t even go on a 40mm bearing without being hammered in.
Don’t throw it away, and do not start grinding away at it, kindly ask them to send you another. Most people do not have milling machines to do a proper job. be happy it’s the bottom cap and not the one attached to your fork, as it can be replaced easily. They should stand behind it, if not this forum would be a bad place for that to become evident. Also by contacting them they could probably shead some light on what is wrong. As someone in business I understand that sometimes things go wrong or slip by, it just happens, It’s a matter of how the company takes care of their customer that is the important thing.
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I have emailed them, and they replied saying that ‘it’s normal’, and I should just hammer it out. They said that if I wanted a new one, I would pay for the shipping both ways. To Italy and back, that’s a lot. Maybe I can bring the piece to Unicon and he might be there.
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Sorry you’ve been treated like that - that’s extremely poor…
Really guess you have 3 options:
- Unicon handover (if they don’t try to fob you off again)
- Take a grinder/other tools to it to try to fix the problem yourself
- see whether a different brand lower bearing housing will do the job instead
Afterwards, vote with your feet.