Yet Another Cycling Forum
General Category => The Knowledge => Topic started by: hellymedic on 18 May, 2017, 02:06:32 pm
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I have copied this from the Audax thread but I feel this issue needs wider attention.
This message was prepared by Ritchie Tout following an incident on the Bryan Chapman Memorial 600 k event May 2017. If you're riding one, please check it out. Note there is also a reference to a TREK headset at the end. This was a separate incident.
"Advice re Specialized headshocks
I thought it was worth posting a note about an incident on last weekend’s BCM. A rider discovered that her Specialized Ruby bike with a suspension system within the steerer meant that the steerer was not part of the fork.
The design is that the steerer slots into the fork crown and is held in place with a collar. This collar is very thin and secured with a 4mm allen headed bolt. All of this is hidden by a plastic cover with the allen bolt being accessed through the side of this.
It looks like it vibrated loose on the ride up to King’s but when she got there the bars no longer turned the fork.
I have contacted Specialized but have not had a reply from them yet. However, it is worth being aware of this problem as it is a system which is unique to Specialized and it is not obvious how it works – at least it wasn’t to us to start off with as nobody considered the possibility that the steerer column was not part of the fork.
I wonder whether AUK should keep a repository of incidents of this kind? Had this rider crashed, I suspect anyone would have thought that the crash was what caused the loose steerer.
We also had a catastrophic failure of a Trek headset bearing. The headset arrangement looked very flimsy in view of the forces transmitted through the headset bearings but it just splintered into several bits and left the bike unrideable."
If you have one of these - do check it. It may be a one - off or possibly more widespread, so collecting data is handy...
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A 4mm bolt seems incredibly small for such a stressed and important part.
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I have copied this from the Audax thread but I feel this issue needs wider attention.
We also had a catastrophic failure of a Trek headset bearing. The headset arrangement looked very flimsy in view of the forces transmitted through the headset bearings but it just splintered into several bits and left the bike unrideable."
It would be nice to know which Trek(s). ???
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Cycle manufacturers are always looking for some feature to encourage you to part with more cash. Often with unforeseen consequences. Don't expect them to change anything as a result of your observations, after all that would be an admission of liability.
There was a case of bars with decorative machined grooves , of course they broke. Several riders were seriously injured.
It came to a court case brought by the good old CTC when they employed Chris Juden C.Eng. to look after us. in Then the new look Cycling UK made him redundant. So now it is a case of buyer beware.
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A 4mm bolt seems incredibly small for such a stressed and important part.
4mm refers to the size of the hex wrench - that's pretty much the norm for all headset related bolts (the bolts could be oversize with a small head)
As an example, some of the Scott bikes that we have in the shop have BIG bolts on the stem but are tightened with a 4mm hex wrench.
Rob
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I have copied this from the Audax thread but I feel this issue needs wider attention.
We also had a catastrophic failure of a Trek headset bearing. The headset arrangement looked very flimsy in view of the forces transmitted through the headset bearings but it just splintered into several bits and left the bike unrideable."
It would be nice to know which Trek(s). ???
If I remember correctly it was a white one :P
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Don't use a chocolate fire guard . . .
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I have copied this from the Audax thread but I feel this issue needs wider attention.
This message was prepared by Ritchie Tout following an incident on the Bryan Chapman Memorial 600 k event May 2017. If you're riding one, please check it out. Note there is also a reference to a TREK headset at the end. This was a separate incident.
"Advice re Specialized headshocks
I thought it was worth posting a note about an incident on last weekend’s BCM. A rider discovered that her Specialized Ruby bike with a suspension system within the steerer meant that the steerer was not part of the fork.
The design is that the steerer slots into the fork crown and is held in place with a collar. This collar is very thin and secured with a 4mm allen headed bolt. All of this is hidden by a plastic cover with the allen bolt being accessed through the side of this.
It looks like it vibrated loose on the ride up to King’s but when she got there the bars no longer turned the fork.
I have contacted Specialized but have not had a reply from them yet. However, it is worth being aware of this problem as it is a system which is unique to Specialized and it is not obvious how it works – at least it wasn’t to us to start off with as nobody considered the possibility that the steerer column was not part of the fork.
I wonder whether AUK should keep a repository of incidents of this kind? Had this rider crashed, I suspect anyone would have thought that the crash was what caused the loose steerer.
We also had a catastrophic failure of a Trek headset bearing. The headset arrangement looked very flimsy in view of the forces transmitted through the headset bearings but it just splintered into several bits and left the bike unrideable."
If you have one of these - do check it. It may be a one - off or possibly more widespread, so collecting data is handy...
The quoted post reminded me of this:
http://www.cyclingweekly.com/news/racing/specialized-takes-blame-catastrophic-component-failure-caused-niki-terpstras-paris-roubaix-crash-325298
OK, the above article refers to a pre-production part, apparently, but it doesn’t inspire confidence. My impression is that this seems to be a system that needs very careful assembly due to being possibly a bit close to the edge in terms of safely margins.
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I was in my LBS last week looking at a new Roubaix and shocked at how complex the set up is.
Doubt I would be happy riding it.
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I have copied this from the Audax thread but I feel this issue needs wider attention.
This message was prepared by Ritchie Tout following an incident on the Bryan Chapman Memorial 600 k event May 2017. If you're riding one, please check it out. Note there is also a reference to a TREK headset at the end. This was a separate incident.
"Advice re Specialized headshocks ...
<snip/>
Note Speclalized have just issued a recall notice (https://bikerumor.com/2019/01/09/specialized-announces-steerer-tube-collar-recall-for-roubaix-ruby-diverge-sirrus/) for many of these "future shock" steerer arrangements.
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On topic, though nothing to do with Specialized Headshocks.
Birzman has recalled their Pump Up tubeless inflators sold 2017-2020. http://www.birzman.com/news_detail.php?cID=3&Key=120 Of course, I have one of them from Tredz. I would have thought that Tredz would filter through their records to contact customers who purchased them but obviously they are relying on folk hearing about the recall by osmosis.
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Brompton are recalling recent e-Bromptons for a firmware update. Apparently they can keep powering on when the rider stops pedalling. https://www.brompton.com/recall
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Brompton are recalling recent e-Bromptons for a firmware update. Apparently they can keep powering on when the rider stops pedalling. https://www.brompton.com/recall
Thanks LWaB. Mrs R's Christmas present will have to go back to Santa :'(
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Anybody got a Canyon with carbon bars?
:-X :-X :-X
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Smyths Toys, mixing up brake cable and gear cable housing?
https://www.smythstoys.com/uk/en-gb/Product-Information
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Smyths Toys, mixing up brake cable and gear cable housing?
https://www.smythstoys.com/uk/en-gb/Product-Information
I'm surprised it fits. I've used brake housing for gear inners in a few places (friction shiters and shifter-controlled brakes), but never thought to see if the other way would work. Cheap cable and a toyshop monkey doing the fitting probably helps.
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Islabikes safety warning:
https://www.islabikes.co.uk/pages/safety-notice-june-2022
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Another Brompton electric recall, but only in North America
https://www.cpsc.gov/Recalls/2022/Brompton-Bicycle-Recalls-Foldable-Electric-Bicycles-Due-to-Crash-and-Injury-Hazards
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New model Brompton front axle QR nuts need to be changed apparently.
https://www.brompton.com/p-line-wheel-nut-update