Carbon steerer not.. round?
Moderator: robbosmans
Hi all,
got this new fork from a reputable online retailer and the steerer, especailly around the top, does not seem round. The pictures maybe show a very faint idea, but when you rotate it in your hands, there are definite little steps that you can feel.
I am concerned about this as all the little notches are stress risers. This is my second fork, first one the LBS cut steerer to wrong length and got me a replacement, however the sterrer was smooth as I can remember.
Please let me know what you all think. Appreciated.
got this new fork from a reputable online retailer and the steerer, especailly around the top, does not seem round. The pictures maybe show a very faint idea, but when you rotate it in your hands, there are definite little steps that you can feel.
I am concerned about this as all the little notches are stress risers. This is my second fork, first one the LBS cut steerer to wrong length and got me a replacement, however the sterrer was smooth as I can remember.
Please let me know what you all think. Appreciated.
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Holy moly. I think it'd be dangerous to clamp a stem there. Pretty sure the expander would also cause problems.
I would ask for another replacement.
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I would ask for another replacement.
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2015 Giant Propel Advanced
2015 Cannondale Supersix Evo
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2015 Giant Propel Advanced
2015 Cannondale Supersix Evo
2013 KTM Strada mod. (totaled)
2011 Pinarello Dogma 60.1(loaner)
2011 Scott SUB 45(sold)
Politecnico di Milano Ingegneria Meccanica
To me the stem looks flared out at the edge.
The stem is fine, the lack of roundness is more due to parallax that any perceptable issues. This is not a WW bike by any means guys, just came here for the advice.
Asked a lecturer at university and said it could even be delamination causing this. The bike shop was about it.
Might have to do a whole RTM... through the bike shop as this is technically their copy. I could take it on but might be caught out by some questions late ron.
Third time lucky eh?
Asked a lecturer at university and said it could even be delamination causing this. The bike shop was about it.
Might have to do a whole RTM... through the bike shop as this is technically their copy. I could take it on but might be caught out by some questions late ron.
Third time lucky eh?
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Have you taken a set of calipers and measured to determine if it is actually out of round? I'm not sure these photos tell us much.
No, sadly don't have any lying around but wanted to.billspreston wrote: ↑Fri Mar 02, 2018 1:53 pmHave you taken a set of calipers and measured to determine if it is actually out of round? I'm not sure these photos tell us much.
I don't think it makes much difference, because this is something you can feel by hand. The fork on my Canyon frame was pretty round, without any of the steps you can see above for example.
Does it neeed to be perfectly round? The composite steerer needs to have integrity and the stem needs to be able to clamp to the steerer securely. If those conditions apply is there really a worry.
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Welcome to modern day manufacturing tolerances.
I've had to put a recent carbon fork on a big lathe, to slightly turn down the beefy crown area to something more concentric.
But the stem area? I wouldn't touch that.
+1 on attempting a replacement.
I've had to put a recent carbon fork on a big lathe, to slightly turn down the beefy crown area to something more concentric.
But the stem area? I wouldn't touch that.
+1 on attempting a replacement.
Maybe it does not need to be perfectly round. In the short term. What about long term though? With these irregularities there is more stress on less material and it would impact the fatigue life. I have have no idea what the safety factor is and I'd struggle to quantify what is medium and short term without seeing the test results. It's all just guesswork. Nothing is certain, but I'd want to reduce the number of things to potentially go wrong, especially if it's something that's pretty glaring like this.
FWIW I felt the original fork in the shop today and it also has these steps but defintely smaller.
UpFromOne - that's pretty odd. Could it have just been the finishing that's set it off? (assuming it was not flat)
EDIT: forgot to add, I've sent an email to the retailer today. Will update once hear back.
FWIW I felt the original fork in the shop today and it also has these steps but defintely smaller.
UpFromOne - that's pretty odd. Could it have just been the finishing that's set it off? (assuming it was not flat)
EDIT: forgot to add, I've sent an email to the retailer today. Will update once hear back.
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Get calipers. I also have a feeling it's the stem, not the steerer tube.
If it wasn't round you would have noticed as it passes through the headset.
If it wasn't round you would have noticed as it passes through the headset.
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