Carbon seatpost cracked straight off at 5 Nm
Comments
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MugenSi wrote:I see people saying they torque their seat posts to 3Nm, isnt that far too little? I have mine torqued to 6-7Nm and TBH i think that its not enough (although I have never tightened it any further) Once i tighten it with a torque wrenc, I loosen it again with an allen key and tighten it back up again to the same point to get an idea how tight it is and 6Nm isnt very tight IMO.
Depends on the seat post, the clamp, the frame it's being clamped too and the rider.
All it has to do is stop twisting and sliding up and down - TBH, it's more likely to twist than anything else, so clamp up until it won't and that's sufficient.0 -
Bar Shaker wrote:Surely this thread is a wind up.
I thought so too but reminded myself that this is Bike Radar forums
All my carbons posts bar one are set to 5nm. The exception is the Foil which is at 12nm (the clamp says 10nm but Scott confirmed that it should be 12nm).
It's a case of by sh*te get sh*te here.0 -
Manc33 wrote:I want a metal seatpost with 2 bolts thats 31.6mm with a 25mm offset, they don't exist.
Err, there's loads.
What about a 3T Dorico Pro?
Or the newer 3T Stylus?0 -
If i have got this right, the OP knowingly bought a fake carbon seat post which (unsurprisingly) cracked and is now looking for another fake carbon seat post?
fair enough.www.conjunctivitis.com - a site for sore eyes0 -
How can anyone claiming it cracked because it is fake have any point when genuine ones crack?
It might be embarrassing for anyone else to post but knowing real ones also crack, not really.
How come both my "fake" saddles aren't cracking?
Carbon seatposts are a no-no for some reason (I wouldn't have a genuine carbon seatpost after this and finding the real FSA one has cracked on people, the real Thomson Elite can crack, a real Fizik Cyrano cracked and so on).
The only difference is with a real one you might get your money back, but then it is always a lot of money like £60 for a seatpost. Nothing else "fake" I have ever got has broken or not functioned as it is meant to, only this.
Why aren't the rails on my fake SMP cracking at 12 Nm per rail? Thats what it takes to stop it slipping backwards on my current seatpost. The one where the notches have flattened and there's nothing to grip (because: 6061 aluminium). You can't tighten a bolt at 12Nm onto a metal notch thats 6061 it just crushes it, the bolt is steel.
I did find a metal seatpost on AliExpress for £9 last night, but it has that one bolt design... but its alright because it does not have infinite adjustment. I only can't have that if it has a smooth curve on the clamp. I went from wanting infinite adjustment to hating it.0 -
I bought a Louis Vuitton hand bag from the lucky lucky man on a street corner in Milan a few weeks ago. He said it's as good as the real thing. Imagaine my (wifes) horror when the zip broke after two weeks.Advocate of disc brakes.0
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homers double wrote:I bought a Louis Vuitton hand bag from the lucky lucky man on a street corner in Milan a few weeks ago. He said it's as good as the real thing. Imagaine my (wifes) horror when the zip broke after two weeks.
That just means you're a cheapskate and bought a cheap fake instead of a more upmarket fake. :P Not all fake stuff is created equal.0 -
I don't know what this AliExpress thing is, but I suspect you'd be better off if you delete it from your favourites list...
:roll:0 -
But the lucky lucky man said so...Advocate of disc brakes.0
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homers double wrote:I bought a Louis Vuitton hand bag from the lucky lucky man on a street corner in Milan a few weeks ago. He said it's as good as the real thing. Imagaine my (wifes) horror when the zip broke after two weeks.
Yes, but at least you only wasted $15, whereas if you'd spent $300 on a real one and the same thing happened.... oh, wait.0 -
Manc33 wrote:homers double wrote:I bought a Louis Vuitton hand bag from the lucky lucky man on a street corner in Milan a few weeks ago. He said it's as good as the real thing. Imagaine my (wifes) horror when the zip broke after two weeks.
That just means you're a cheapskate and bought a cheap fake instead of a more upmarket fake. :P Not all fake stuff is created equal.
Genuine question for you. Can you give me a straight answer?
Why do you think the one is £25 and the other is £60?0 -
Because UK shops slap a massive profit on items.
Let me ask a question - how much do you think the carbon seatposts that cost £60 in the UK actually costs for the place selling it to you? Hint: It ain't £60. I bet it ain't even £40.Colinthecop wrote:I don't know what this AliExpress thing is, but I suspect you'd be better off if you delete it from your favourites list...
:roll:
lol, not a chance.
I've been ripped off in this country for the last 30+ years, its nice to get a break from it at long last.
Anytime you go buy anything from a high street shop it is made in China so the "its all crap" rule doesn't apply, well it never does when people go shopping, they seem to trust shops for some reason, even though those shops are just buying it all from... yep... places like AliExpress.
They don't just sell fake stuff on there, a lot of genuine stuff is just cheaper. You might have to wait 6 weeks for it but it turns up in the end.
Anytime on there you do have to consider "Would they even make a fake of this" lol. Its a minefield I guess, but when you're skint its the only option... or don't have things. Then again we are coming around to winter. I suppose I could just never go out on my bike.0 -
Manc33 wrote:Because UK shops slap a massive profit on items.
Let me ask a question - how much do you think the carbon seatposts that cost £60 in the UK actually costs for the place selling it to you? Hint: It ain't £60. I bet it ain't even £40.
How much R&D, pre-production and ongoing QC do you think goes into the fakes?0 -
Manc33 wrote:Because UK shops slap a massive profit on items.
Let me ask a question - how much do you think the carbon seatposts that cost £60 in the UK actually costs for the place selling it to you? Hint: It ain't £60. I bet it ain't even £40.
Granted, probably about £20.
How much do you think the cheap knock-off from tinternet actually costs for the place selling it to you? Hint: It ain't £25.Manc33 wrote:I've been ripped off in this country for the last 30+ years, its nice to get a break from it at long last.
Your new approach of not buying from UK shops is defintely serving you better at the moment... oh, wait.0 -
It is if I bought various "fake" carbon items and only this seatpost broke out of any of it (genuine carbon ones also crack). People seem a bit narrow minded about it. I mean stuff like "Don't get it from China" then they go shopping the next day for a toaster made in...
Whichever vendor sold this seatpost may or may not have any quality control. Some of them do. Its not as clear cut as people think. Plenty of vendors show videos of them hammering saddles to try to break them, claiming they test every saddle.
Finally - if ALL this stuff was bad, it would be reflected in the comments on the pages where it is bought. It could just be that I got a duff seatpost and these ones are normally fine, who knows.
Guess what's put me off getting a carbon seatpost (or bars)? It isn't because it is Chinese... it is because I only just realized there's at least three other brand name ones that can crack, all cost a fortune and one of them ain't even carbon. So on an item like this yes, its not worth it - but its not worth trying to use a genuine one either! The fact that something is a fake plays a small part if that fake one is known to be good (from people's feedback - which itself can be faked but thats another issue).
People go from one thing to the next. First they say "Its crap, its Chinese, its cheap rubbish" but a lot of stuff is made in China. So then they say they don't have the quality control. Then they say one is this price and one is that price for a reason... there's never a realistic answer to me. Its the usual propaganda lol. "Them over there" are worse than us, they have to be, right?0 -
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Massive chip on your shoulder against brands and UK shops ...
Ok - I understand the frustration at the markup - but look at what you're buying.
You bought a £25 seat post and it's rubbish - as you've said it's not worth the £25 to send it back to get a replacement. You're right - but had you spent £50 on the same item in a shop then you could've taken it back and got it swapped or had a refund.
Plus, with a brand in a shop you've got additional "protection" - the brand will be looking after it's name - R&D plus QA will be important to it and whilst you're still buying stuff from Chinese factories you can at least know that it's made to a specification.
Why are there cheap chinese "knockoffs" then ... because there is a massive workforce in china and plenty of incentive to make money - you have no idea how much it costs them to make the £25 seat post - a lot less than £25 - how much of that was R&D or QA? Very little I would think - backed up by the thin and failing seat post you bought. What do you think happens to failing manufacturers in China? They change name and start up again - same as happens in the rest of the world.
Not all Chinese knockoffs are rubbish - not by a long shot, but in buying these you're taking the risk - this is why most people still buy brands from shops - even EU ones - to afford themselves some protection.
I have a carbon bike, with carbon bars, carbon seat post and a saddle with carbon rails - not one item has failed, nor would I expect it to - they're all branded parts and have the backing of the brand warranty.
I have 2 cheap chinese lights - one is good the other one is temperamental - neither match the reliability and quality of the Cateye lights we have at 4 or 5 times the price - are Cateye made in China? Wouldn't be surprised.0 -
To add to your point that's not so much of an issue if a genuine one can also crack on a fast descent, as others have mentioned earlier. You wouldn't care about the £60 with the possible consequences.Manc33 wrote:The only difference is with a real one you might get your money back.0 -
this can't be serious can it?
granted real ones can crack, i'm pretty sure there isn't anything in the known world that under certain circumstances wouldn't crack. but the chances of them cracking are much lower, your fakes costs £25 which might seem like a bargain but if the real one will last 4 times longer and costs £60 then it doesn't seem like such a good deal does it? you might be lucky, you might not be, but you are already on your second one so that £50, you are only £10 up so far, if the next one is a dud to then you are already losing.
your point about the comments, do you think there is any chance that maybe, just maybe, these companies decide what makes it on to their site or not?www.conjunctivitis.com - a site for sore eyes0 -
I cannot imagine anything more painful than pulling shards of carbon fibre out of my undercarriage. I would never knowingly buy a fake structural part.0
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Is there a carbon friendly slot design, eg helicalMr Evil wrote:When a seatpost clamp is tightened, the edges by the gap are pulled inwards. If they line up with the slot in the seat tube, all the clamping force will be concentrated along those two edges, potentially crushing the post.
DUAL SLOT DESIGN
twin-bolt facelate
Wedge ?0 -
There is one featured in this post, scroll down to post number 7.
http://forums.roadbikereview.com/compon ... 51371.html
http://www.wiggle.co.uk/campagnolo-sing ... ost-clamp/
http://www.wiggle.co.uk/bbb-bsp-82-carb ... ost-clamp/
http://www.wiggle.co.uk/miche-seat-post-clamp/0 -
FSA have sent me a new K-Force Carbon seatpost after checking my cracked one over, surprised as I'd assume that it would be deemed user error for overtightening the clamp.
Not complaining though 0 -
At what point did anyone say its bad because its Chinese? It's bad because its a fake product, regardless of who made it. Plenty of reputable products come from China. The person making fakes doesn't have a brand to protect and little interest in decent R&D etc. I could go on but basically, what everyone else said..0
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eddiefiola wrote:FSA have sent me a new K-Force Carbon seatpost after checking my cracked one over, surprised as I'd assume that it would be deemed user error for overtightening the clamp.
Not complaining though
Do you know what it weighs by any chance? The fake one weighs 208g.
Even the next metal one I ordered (£9) says "Truvativ" on it and I think is some knock off of a £30 or £40 post. :roll:
I didn't want it to say anything on it lol, but you can't get anything from that place that's not fake or a clone of something. decathlon sells one that fits the bill but its white.
No wonder its got 68% off. 0 -
Mine is the 32mm setback version of this http://www.bike24.com/1.php?content=8;navigation=1;product=28314;page=1;menu=1000,4,9;mid=77;pgc=10996:11001::10998:11004 says 210g for the 27.2 sb25 version so maybe 220 for the 31.6 sb32?
Dunno should be here tomorrow morning can weigh it then.0 -
I just wondered if it is a similar weight and it is. In China I think they count that as part of the cloning, has to be the same weight. Then you see a lot of comments saying "This is lighter than the real one" lol.
I might seem reckless about trusting this stuff but I only go for certain things. Like my frame, thats carbon but I would never dream of buying one from there, I got it in the UK and the price it was made it so I pretty much had to buy it. Its literally at "China prices" anyways at £350 from Planet-X.
Maybe its a cheap one because of that 36.6mm seatpost clamp requirement. Still, something like a fake frame I would be scared on yes. Cheapest I ever saw a China carbon frame was about £225 or something, wouldn't buy one.
I think with seatposts, stems and handlebars unless you're racing, what's the point in it being carbon. Same with wheels. I only ended up with a carbon seatpost because I kept finding China only seems to sell carbon ones, I guess metal seatposts are laughed at or something now cheap carbon ones are out?
Its a shame its all scratched, it looked really nice when it was new. That is its only purpose really, an ornament.
Gonna test my makeshift post out tonight and see if I end up slipping backwards. When I get my next seatpost thats 4 spare seatposts I will have + the broken "FSA" one + the one on my bike. :oops: I only own one bike.0 -
Manc33 wrote:Gonna test my makeshift post out tonight and see if I end up slipping backwards. When I get my next seatpost thats 4 spare seatposts I will have + the broken "FSA" one + the one on my bike. :oops: I only own one bike.
Your problem is that all your problems are unique to you; nobody else is unable to find carbon or alloy seat posts to suit them. I have about 8 seatposts used on various bikes and the only issue I've ever had is that a couple of the vintage ones are a little short. I can make the clamps work whether one or two bolt and I can torque them up so they don't move whether alloy or carbon and it's never a problem. Maybe you just aren't meant for tightening bolts! Faster than a tent.......0 -
If you can't afford a Posh carbon post just buy an aluminium one, simple. You can buy a deda one or whatever from ribble or wiggle or who ever for less than you are paying out on grey import fake rubbish. Ok it might weigh 100g more but in the grand scheme things it is bugger all difference and way safer. There is really no point asking for advise if you don't accept any of it might be right. Right out there with radiation man!0
