Lankeleisi frame failure - seriously dangerous
03-17-22, 01:38 PM
#26
Senior Member
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 27,547
Mentioned: 217 Post(s)
Tagged: 0 Thread(s)
Quoted: 18378 Post(s)
Liked 4,512 Times
in
3,354 Posts
The OP seemed to indicate the final separation occurred while he was "Just Riding Along (JRA)".
However, we don't know a lot of history about how the bike was ridden.
Still, we've found two videos of different bikes that apparently ruptured in the first year of service.
A fat tire full suspension MTB should be designed to take a fair amount of abuse. Certainly not babied along like my road bikes.
The design at the pivot appears to be under supported.
The only activity that I would specifically exclude from "normal" would be certain car/bike crashes, and jumping several feet high and landing on a flat surface.
03-18-22, 12:06 AM
#27
Senior Member
Join Date: Feb 2017
Location: Merry Old England
Posts: 772
Bikes: Muddyfox Evolve 200, Bicycles4u Paris Explorer, Raleigh Twenty Stowaway, Bickerton California, Saracen Xile, Kona Hoss Deluxe, Vertigo Carnaby, Exodus Havoc, Kona Lanai, Revolution Cuillin Sport, Dawes Kingpin, Bickerton, NSU & Elswick Cosmopolitan
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 297 Post(s)
Liked 33 Times
in
25 Posts
It's always important to factor in how a frame fatigues, it gets weaker with time and the point where it had a high level of fatigue may not be the time it breaks that could be weeks, months or even years later. As you can see the aluminium frame starts off much stronger and at the end of life only has about a third of the strength to deal with the stresses of use. They are designed to last about 7-10 years of normal use up to the load rating they have stated typically. Some aluminium self-hardens even when not used so becomes more brittle just with time.
03-19-22, 09:04 AM
#29
Senior Member
Join Date: Jul 2014
Location: socal
Posts: 4,265
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 883 Post(s)
Liked 823 Times
in
622 Posts
Clearly you care if you had to reply.
As I said before you're entitled to your opinions, but without specific details of the frame failure and how it occurred, your opinion is based on speculation.
Regardless of what I want, opinions based on speculation, not facts or details, are simply invalid.
OP has not provide any more specifics about the frame failure, to me, he could have hit a giant pothole or jumping off cliffs prior to frame failure.
Maybe the frame is poorly designed to begin with, but usage over 7 months as OP did could cause significant frame stress.
As I said before you're entitled to your opinions, but without specific details of the frame failure and how it occurred, your opinion is based on speculation.
Regardless of what I want, opinions based on speculation, not facts or details, are simply invalid.
OP has not provide any more specifics about the frame failure, to me, he could have hit a giant pothole or jumping off cliffs prior to frame failure.
Maybe the frame is poorly designed to begin with, but usage over 7 months as OP did could cause significant frame stress.
Last edited by 2old; 03-19-22 at 09:10 AM.
03-19-22, 10:35 AM
#30
Ride more, eat less
Join Date: Feb 2007
Location: Philla PA, Hoboken NJ, Brooklyn NY
Posts: 2,075
Bikes: Too many but never enough.
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 715 Post(s)
Liked 737 Times
in
453 Posts
Without specific conditions of failure given by the OP, you're ignoring crucial evidence required to determine how the failure occurred.
What evidence do you have that this frame design resemble what I ride? can you provide them? or just assuming & speculating that from my previous posts months (or years) ago?
Clearly you can't resist posting replies, since you keep posting claims that you can provide zero evidence to support.
To call the bikes I ride crap without knowing exactly what I ride is just rude. Have I ever called your bikes crap?
Besides, this thread is not about what I ride, stop deflecting from topic of thread and assume things about me that you have zero clue of.
Last edited by cat0020; 03-19-22 at 10:48 AM.
Likes For 2old:
03-28-22, 10:00 AM
#32
Senior Member
Join Date: Jul 2015
Location: Chicago Suburbs
Posts: 1,406
Bikes: GT Transeo & a half dozen ebike conversions.
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 340 Post(s)
Liked 275 Times
in
192 Posts
If this were a US major, CPSC would force a recall. Trek recalled a whole years worth of bikes because a loose front skewer lever could get caught up in the disk rotor. LOL. If they weren't forced to use lawer lip washers, the wheel would have have fallen out and that would never happen. I think Trek either put on a new skewer with a shorter lever, or they flipped it to the other side.
Now that I see the pictures, look like the center tube was just too weak. Snapped off an inch or more below the weld.
There's really too many chinese ebikes coming in with frames that are copies of copies, with no engineering. I've seen a couple of other folder frames that snapped and the importer discontinued that model. Another major importer had a half dozen threaded steerer tubes snapping off.
Now that I see the pictures, look like the center tube was just too weak. Snapped off an inch or more below the weld.
There's really too many chinese ebikes coming in with frames that are copies of copies, with no engineering. I've seen a couple of other folder frames that snapped and the importer discontinued that model. Another major importer had a half dozen threaded steerer tubes snapping off.
03-28-22, 10:43 AM
#33
Senior Member
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 27,547
Mentioned: 217 Post(s)
Tagged: 0 Thread(s)
Quoted: 18378 Post(s)
Liked 4,512 Times
in
3,354 Posts
In this case, the frames would have to be either replaced or gusseted, likely putting the company well into the red if they were to do it. If the frame could be disassembled, it would be replacing the mid section behind the hinge and in front of the rear swing arm.
@JonnyS is apparently from Busan South Korea. So, undoubtedly different regulations than here in the USA, and even more complicated if the bike was mail order from China.
I was thinking about offering to purchase some of the E-Bike components for a project, but it is quite far away.
03-28-22, 10:15 PM
#34
Junior Member
Thread Starter
Join Date: Mar 2022
Posts: 7
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 4 Times
in
2 Posts
A skewer is a mighty cheap and simple fix.
In this case, the frames would have to be either replaced or gusseted, likely putting the company well into the red if they were to do it. If the frame could be disassembled, it would be replacing the mid section behind the hinge and in front of the rear swing arm.
@JonnyS is apparently from Busan South Korea. So, undoubtedly different regulations than here in the USA, and even more complicated if the bike was mail order from China.
I was thinking about offering to purchase some of the E-Bike components for a project, but it is quite far away.
In this case, the frames would have to be either replaced or gusseted, likely putting the company well into the red if they were to do it. If the frame could be disassembled, it would be replacing the mid section behind the hinge and in front of the rear swing arm.
@JonnyS is apparently from Busan South Korea. So, undoubtedly different regulations than here in the USA, and even more complicated if the bike was mail order from China.
I was thinking about offering to purchase some of the E-Bike components for a project, but it is quite far away.
What doesnt kill you makes you wiser and all that 🤣
Likes For 2old:
