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Old 2019-07-17, 07:04 PM   #1
joshpit2003
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Avoid Nimbus Seat Posts

Unicycle(dot)com is sending out a bad batch of these Nimbus Alloy Seat Posts. That, or their photo is very misleading.

The image online:


What you actually get:


Why it sucks:
- Strength is a function of diameter. A seat-post should not neck-down like this.
- Sharp corners are stress-points. These welds aren't great for that either.

Response from UDC after bringing it to their attention:
(paraphrasing here):

"Thanks. You need to pay to ship it back to us, then buy something else".

So save yourself the hassle, and just spend the extra $5-$10 to buy a quality seat post.

Good luck and happy riding.

-Josh!
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Old 2019-07-17, 08:19 PM   #2
finnspin
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I've had good experience with UDC Germany so far, but that is just ridiculous. It looks like the robot welding the seatposts was setup wrong, and absolutely missed the bevel it was supposed to weld in. Clear quality control error that is not acceptable, and they should take care of.

EDIT: I have the seatpost pictured on top on my oracle, and it well.. looks like in the top picture, so they did get it right in the past
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Last edited by finnspin; 2019-07-17 at 08:23 PM.
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Old 2019-07-17, 09:16 PM   #3
bouin-bouin
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Contact first your shop to solve the issue !
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Old 2019-07-17, 10:35 PM   #4
finnspin
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Quote:
Originally Posted by bouin-bouin View Post
Contact first your shop to solve the issue !
That's what he did. From their (paraphrased by joshpit2003) response, they don't want to recognize this as an issue.
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Old 2019-07-17, 11:04 PM   #5
joshpit2003
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Quote:
Originally Posted by finnspin View Post
I have the seatpost pictured on top on my oracle, and it well.. looks like in the top picture, so they did get it right in the past
I guess that confirms it's a manufacturing defect. Thanks for the info.

I had ordered 2, and both showed up with the same defect. I reached out to UDC with photos and explanations. Since I was asked to pay to ship 'em back, I assume they consider the defect normal and these exact seat posts (or similar) will be shipped out to other customers.

Hence the warning.
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Old 2019-07-18, 02:46 PM   #6
MrImpossible
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Quote:
Originally Posted by joshpit2003 View Post
I guess that confirms it's a manufacturing defect. Thanks for the info.

I had ordered 2, and both showed up with the same defect. I reached out to UDC with photos and explanations. Since I was asked to pay to ship 'em back, I assume they consider the defect normal and these exact seat posts (or similar) will be shipped out to other customers.

Hence the warning.
I have to agree. I have three of those seatposts sitting around and none of them neck down like that. Mine are all the older model without the gusset-type thing at the top, but that shouldn't change anything. The UDC web site has an unboxing video for the new version of the post, and it doesn't neck down much.

So yeah, defective, and they should really take it back at no charge and quit selling that batch.
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Old 2019-07-19, 01:36 AM   #7
JimT
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Quote:
Originally Posted by joshpit2003 View Post
Why it sucks:
- Strength is a function of diameter. A seat-post should not neck-down like this.
- Sharp corners are stress-points. These welds aren't great for that either.
It is kind of hard to claim the part is structurally deficient just based on the external appearance. The strength at the smallest tube section is based on the actual diameter and tube wall thickness at that location. If the tube wall thickness is thicker at that point then is could be just as strong as a larger diameter tube with a thinner wall thickness.

It does look like most seat tube failures occur on the flat part that attached to the seat. I guess the only real way to say if it is a problem it to do some structural testing or just put it to use and see what happens.

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Old 2019-07-19, 06:53 AM   #8
joshpit2003
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Originally Posted by JimT View Post
I guess the only real way to say if it is a problem it to do some structural testing or just put it to use and see what happens.
Naw, I feel bad enough paying (return shipping) to do their Quality Control. I'd feel a lot worse if I paid (physically) to do their stress-testing.

I just purchased an Impact seat post for $5 more and peace of mind.
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Old 2019-07-22, 01:09 AM   #9
lightbulbjim
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Quote:
Originally Posted by joshpit2003 View Post
I just purchased an Impact seat post for $5 more and peace of mind.
Impact is also Nimbus .
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Old 2019-07-22, 03:34 AM   #10
joshpit2003
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Quote:
Originally Posted by lightbulbjim View Post
Impact is also Nimbus .
LOL. Doh!

Well, on a positive note: I can confirm the Impact seat posts are as-pictured and seem plenty strong.
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