Author Topic: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?  (Read 1474307 times)

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #780 on: May 02, 2025, 12:20:00 PM »
Looks like it's right where the brake hose enters the fork. I'm looking at mine and pressing it and it seems very strong/sturdy. Definitely nerve-racking though...
I guess another benefit of ordering a raw carbon frame is you can look at the weaves and maybe pick up on carbon failure earlier
« Last Edit: May 02, 2025, 12:27:00 PM by greengoblinbean »

glepore

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #781 on: May 02, 2025, 12:20:29 PM »
That's concerning for sure.
The fork is thin there, its part of the reason specialized uses the unique narrow flat mount spacing on the sl8, to reduce the area reinforced for the mounts.
Looks like a straight up failure, given no issues with the other fork leg.
You'd be surprised how frequently forks get damage by foreign objects without the rider being aware, but its almost 100% damage to both legs (handled a few legal cases involving forks when still working).

glepore

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #782 on: May 02, 2025, 12:25:22 PM »
Hold a sec, looking again, there IS damage to the other fork leg higher up?
Can you say with any certainty that that was the result of the impact and not occurring at the same time as the other failure?
Not to cross examine you, but...have had experience with a few of these over the years.

CoreX88

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #783 on: May 02, 2025, 12:41:06 PM »
Hold a sec, looking again, there IS damage to the other fork leg higher up?
Can you say with any certainty that that was the result of the impact and not occurring at the same time as the other failure?
Not to cross examine you, but...have had experience with a few of these over the years.

The fork was fine on both sides when I started. When I approached the crossing it definitely felt like the left side snapped first under breaking. I took a "dive" and fell over the handlebar. I think the right arm cracked due to my weight going over the handlebar and having no support from the other side. I just had a look at the point where the hydraulic hose comes out of the fork and the material is not "bonded" but more separate layers. Anyway, I hope TanTan will find a good solution. The ride feel on this TT-X68 was very good.   

rasch

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #784 on: May 02, 2025, 01:58:53 PM »
The fork was fine on both sides when I started. When I approached the crossing it definitely felt like the left side snapped first under breaking. I took a "dive" and fell over the handlebar. I think the right arm cracked due to my weight going over the handlebar and having no support from the other side. I just had a look at the point where the hydraulic hose comes out of the fork and the material is not "bonded" but more separate layers. Anyway, I hope TanTan will find a good solution. The ride feel on this TT-X68 was very good.

Glad you're OK and props to you for keeping trust in riding this frame. I'd never be able to do  so... and you can see in my other comments that I privilege assistance quality above anything else. Of course this is likely an isolated case, but on a personal ground would look elsewhere :)

glepore

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #785 on: May 02, 2025, 02:09:24 PM »
Hmm, sounds like either the prepreg was contaminated or some other process failure...

Dr J

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #786 on: May 02, 2025, 03:16:13 PM »
Holy moly! Glad you are ok! That must have been very scary! Luckely you werent going 60kmh downhill!

This incident could have a big impact on the sales of this frame

Sander2177

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #787 on: May 02, 2025, 04:21:47 PM »
I've got a carbon cradle here, its a couple grams lighter, not sure if its worth the trouble. Are you going to use yokes instead of the alu top piece?
Have a couple extralight expanders here, know folks use them, but there must be a reason Specialized uses the overbuilt one, likely liability if a failure.
As to a manual, there's an early post here where someone was told to use the sl8 manual.


Yes plan to swap the cradle, yokes and bolts for Ti but will have a look into
It when I receive this.
Well there was one failure that done the rounds on the old SL7 so they made the change as the SL7 s compression ring was steel the SL8s is now plastic so think the likley hood is less likely

BeR

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #788 on: May 02, 2025, 06:03:08 PM »
Let us know the answer of Tantan.

Sander2177

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #789 on: May 03, 2025, 03:21:28 AM »
Nope, no bump and no crash. I really took good care of it and I've ridden it just for a bit under 150 km...

See below and resized ;) I remember it first cracked on the left above the caliper. The thickness of the material in this section is really thin...

Jeez!
That’s not good at all — but the main thing is you’re okay!
Like someone else said, it’ll be interesting to see how TanTan handles this and, just as importantly, what actually caused the carbon failure on the X68.
Definitely not a great situation for you, but hopefully it’s just an isolated incident

Tom77

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #790 on: May 03, 2025, 05:05:16 AM »
Given the intransigent communication regarding delivery dates and issues on supply side, I'm assuming that tantan is not producing the frame in-house so they might be not fully aware of quality control situation.

Normally the snakes fork has to be analyzed by a quality technician or surveyor to estimate the risk for ruining production.

Just my 2 cents as an automotive engineer

Sander2177

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #791 on: May 03, 2025, 05:36:37 AM »
Given the intransigent communication regarding delivery dates and issues on supply side, I'm assuming that tantan is not producing the frame in-house so they might be not fully aware of quality control situation.

Normally the snakes fork has to be analyzed by a quality technician or surveyor to estimate the risk for ruining production.

Just my 2 cents as an automotive engineer

Appreciate your input — and that makes a lot of sense, especially given your background.
The lack of clarity around delivery delays already raised questions, so your point about TanTan possibly outsourcing production adds another layer. If they aren’t closely tied into the manufacturing side, it could explain both the communication issues and potential gaps in QC.

A carbon fork failure is serious — it’s not just a warranty issue, it’s a safety one. The real question is whether this will actually be properly assessed or if TanTan will just send out a replacement fork and consider the matter closed. Since they’re not a Western brand, the approach might be very different from what we’d expect from companies like Specialized — where something like this could trigger a full investigation, order holds, recalls, and checks across the board.

That said, I know some forum members have been receiving their TanTan frames since late last year, and aside from a few minor issues, things have generally been fine. Hopefully this really is just an unfortunate, isolated case.

Let’s see if TanTan actually honours their “warranty” — and how seriously they treat the implications.

Well, I’ll definitely be giving the fork a good inspection when mine arrives — adding pressure around that area, doing some flexing and squeezing, just to see if anything feels off. Better safe than sorry.



jonathanf2

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #792 on: May 03, 2025, 11:27:05 AM »
My contact in China said there's no way some of these vendors are building these frames in-house. Carbon molds are expensive ASF, so there's a good chance TanTan is sourcing the X68 elsewhere.

Also it's worth noting the SPCycle R088 frameset which is also an SL8 derived clone uses and entirely different fork (and head tube design). It makes me wonder if they did so because of potential issues copying the SL8 1:1?


glepore

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #793 on: May 03, 2025, 12:10:59 PM »

Also it's worth noting the SPCycle R088 frameset which is also an SL8 derived clone uses and entirely different fork (and head tube design). It makes me wonder if they did so because of potential issues copying the SL8 1:1?

Could be, or could just be they didn't want to be limited in caliper selection given the unique nature of the sl8's flat mount spacing.

Dr J

Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
« Reply #794 on: May 03, 2025, 02:45:59 PM »
It looks like there's no epoxy in this fork. The strands of fiber look dry, dont they? The level of incompetence needed for such a failure at such low speed is enormous. It's not like you're 90kg riding at 90kmh and hit a cat sized pothole.
When i was looking at which OEMs to have on my white list, i never put tantan because stories like this one keep popping up. On this forum, there are a LOT of horror stories about tantan. And i can't figure out if it's because they suck, or because they're so big that it's unavoidable to have issues sometimes. This incident makes me lean towards the "they suck" more. Either way, no bum bum tam tam for me.

If you plan to keep riding this frame, I tip my hat to you, you're a brave man.

Yeah; this makes me very happy that I opted for the r088. After seeing this I would never buy this the X68; I value my life too much for that.