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Re: 2022 Cervelo S5 Questioning one's spending choices on fake frames: BAD
Insulting one's spending choices on legitimate (albeit expensive) frames: GOOD

Chinatown logic...

April 02, 2023, 08:49:25 PM
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Re: Thinking of Going Deeper – A More Honest Look Inside the Replica Frame Industry
Ironically, I think the effect of this thread has only been to increase interest in counterfeit frames.

I’d actually disagree — the interest in counterfeit frames has always been there, it’s just that people are now more openly talking about it.

I understand it’s a sensitive and divisive topic. Some will agree, others won’t, and yes — it’s technically illegal. I’m not denying that. Is it in the true spirit of the forum? Maybe not entirely. But the reality is that the demand is huge, whether we like it or not. And with demand comes discussion.

That’s the value of threads like this — they spark conversation, debate, and hopefully, awareness. I’m not here to promote counterfeits, but if people are going to explore that route anyway, I’d rather they be informed and aware of the risks — safety being a big one.

It’s a bit of a catch-22. You either bury your head in the sand and pretend it’s not happening, or you engage with it in a way that helps people make smarter decisions.

June 20, 2025, 01:29:34 AM
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Re: Thinking of Going Deeper – A More Honest Look Inside the Replica Frame Industry


That said, this SL8 frame in question. From what I've read so far:

- The replica frame fork is lighter than a genuine SL8 fork (some reports of it "exploding" too). Why is this?

- Not sure, but does a genuine SL8 seatpost fit into the replica SL8 frameset? If not, then that's quite revealing.

Ultimately, no matter how much research you do, I think the final end result will be the same. IE: It's way cheaper than a genuine SL8, it's good, but it's not better.

The replica fork in practice generally isn't lighter than an actual sl8 fork. The quoted weight may be, but there's a very wide tolerance quoted. There is one report of failure that I'm aware of . I did a fair amount of bike law in a prior life and I can vouch that carbon parts from big companies fail too. In fairness, they are subject to remedies that tantan and others likely aren't, but hey, if you're injured I'm not sure that's a major factor. That said, yes, I suspect that the factory producing for Specialized in all likelihood has more qc oversight than the average "replica" as most are sold by resellers.

As far as parts fitment goes, there is a very slight variance between the actual sl8 post and the tantan post. Reports have been of 1mm or so. Likely a cad or scanning error. Otherwise the parts work.

But to your greater point, I don't think anyone buying these frames expect them to be "as good" or "better".  I've said before that I bought one because I'm old af and wasn't sure I could make an sl8 actually usable for me, and risking $700 was much different than risking 3k+. Turns out the bike fits, and is a very nice ride, nice enough that I grab it almost always before some high end og bikes.
I honestly don't feel the need to upgrade to a "real" sl8 at this point for the marginal gain. I don't doubt that the real bike is "better" in some way, but I would speculate that a) its not 5x better and b) that confirmation bias aside, without labels you'd be hard pressed to tell.

I get that at the end of the day folks have an issue with flat out fakes and "homage" things. Bicycles, watches, handbags, whatever. I don't begrudge that. I'm living on an adequate but "fixed" income now and can't play in the luxury world any longer.  But if the "real" value of something is grossly inflated by marketing costs, distribution costs, dealer networks yada, I'm ok with not paying that tax.

Thanks for your participation here, your bikes and photos are well composed and beautiful.

June 20, 2025, 06:56:36 AM
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Re: Thinking of Going Deeper – A More Honest Look Inside the Replica Frame Industry I am ideologically opposed to counterfeits and believe frames like the X68 risk being deemed counterfeits, even when not branded. However, I do like this thought experiment, and even the information so far is going a long way towards dispelling the rumors that these are simply frames that fell off of a truck.

At a high level, we need to remember that the load of a modern carbon frame is carried through its external structure, which is why it is referred to as a monocoque frame. Regardless of the construction method, if you can build a frame that passes ISO testing, it's likely to feel remarkably similar; the shape of that structure will be the most significant factor in determining the stiffness of the frame. Details like layup and wall thickness can make a difference, but they are an order of magnitude less important.

That said, the most significant issues with counterfeits of high-end frames are that I don't get the sense that the people doing the replication understand where the original designers made tradeoffs to achieve the performance of their frames. Remember a lot of these frames have known drawbacks like the lack of front-end stiffness of the SSE, front-end performance and reliability on Factors, and seat tube / seat post clamp + stay cracking issues on the Dogma F12 and F. Given that the outside form has a significant influence on the structure of the frame, its not a surprise that replicas seem to suffer from the same issues, potentially at a higher rate. I think VB even stopped making their Dogma clone.

My questions to a replica builder would be to understand if they identified any potential weaknesses in the original design and how they managed that.

I am guessing they don't think about it at all as they are focused on the form, and it's better to buy an original open mold where some engineer thought about and made decisions, conscious of the tradeoffs they were introducing. To me, an analogy is that the replica is having a Frank Lloyd Wright replica house built op top of a waterfall with the help of an architect, but without a review by a structural engineer. The open mold is a structurally sound McMansion with little architectural involvement.

June 20, 2025, 01:31:56 PM
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Re: Thinking of Going Deeper – A More Honest Look Inside the Replica Frame Industry
with respect to the quality of the production we heard the same thing about carbon wheels direct from China for years. as it stands today, i don't for see myself ever buying a traditional western brand wheel ever again. the pace of advancement in wheels from China is way out ahead of the pack.

quality of frame production is on a similar trajectory. my only current direct from China bicycle frame is my MTB but i have absolutely abused that bike including wrecking hard coming down Jack Mountain in Georgia and it keeps on giving. it has been a great bike.

i am in the the process of helping my son build up an X68. when done it will be yet another data point of its construction and ride quality vs an actual SL8 (mine).

Whoa there. Please don't take what I said out of context. I am talking about replica brands NOT Chinese production or Chinese brands. IMO, there are people in China as qualified as any western engineer to design a bike frame.

I also have huge respect for the wheel brands that are bringing lightweight layups and focusing on what they do well to deliver excellent products. I also have experience working with Chinese factories on projects, and though language barrier can make communications awkward, they are in no way worse than Western factories. Trade war be damned I have nothing but respect for smart, honest businesses trying to make a buck.

June 20, 2025, 06:10:27 PM
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Re: Thinking of Going Deeper Counterfeit Frames – UPDATE and Fund Link
If your project succeeds, I will be happy to contribute to the cause (even if the frame in question does not directly concern me)....I am waiting for the counter to reach at least £300 GBP  ;)

Thanks Bonus79!
The counter is at £179.19!
Someone I know not on the Forum has ordered and X68 so he said he is happy to pass me his frame for inspection
I am contacting this company this week https://carboncyclesolutions.co.uk/

June 25, 2025, 05:08:37 AM
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LTK266-D-SL, race frame, 680g, <800g w/paint & metal parts (M), fits 35mm+ tires I don't think there is a thread for this frame yet. I spotted it earlier today, and while conservative in terms of design, it ticks a lot of boxes for someone looking for a frame that can handle a bit of cross, light gravel, and road riding.

Things I like:
  • 35mm Tire clearance This is conservative. I expected 4mm of clearance with 35mm tires. I have measured ~8mm of clearance with 33WAM tires and ~6mm of clearance with 37mm WAM tires
  • Pretty standard road geometry--chain stays at 410mm are a little longer than I would like, but still plenty short Yes. It handles and climbs like a very good road bike. Very TCR like.
  • Designed to mimic the Giant TCR in terms of stiffness numbers and feel (per the information listed on the website for the Permeants St-09 version)
  • UDH
  • T47i (85.5mm)
  • Weight, they are claiming 760g frame and 325g fork including metal parts for a matte painted bare frame and like 20g more for a transparent green Time style paint. The seatpost weighs 98g and appears to use Ritchey-style hardware. This is likely >250g lighter than something like the SP cycle R088. EDIT: Given the weights posted here, S and M frames should be sub 800g with accessories and lighter-weight paint jobs. These weights have been verified and are realistic. The 680g marketing weight for the bare frame is also likely a very real number. Frame seems to match up well numbers wise with the Seka Spear RDC and the Elilee Blize XXE. Absolutely bonkers at this price.
  • Claimed T1100, T1000, M65 blend. If true this is a nice high-end blend of medium-mod / high-strength and high-mod fibers
  • Standard 1.5in headset Based on what we have seen so far, your best option is probably to buy a FSA No55R (40x51.8x8mm 36°/45°) headset separately and look for a FSA compatible stem / one-piece barstem
Things I don't like:
  • Only one fork offset across the range, they should have a 50mm offset for the smallest 2 sizes IMO
  • Stacks are a little high for a true race bike in the L, XL, and XXL.
  • I personally think a few more MM BB drop would be nice, assuming a 30mm or 32mm tire size rather than 28mm will be run with this frame.
  • Does not come with good rubber accessories. There are no rubber plugs to block the holes for unused mechanical cables for the FD or for the RD routing if wireless. The seatpost clamp cover looks like it was inspired by a napkin. See the notes below in the "Things to consider when ordering this frame" section for alternatives.
I have no idea about the price, but overall this looks like really nice option for a build. The price for the bare frame (no headset or thru-axles) with clear coat is currently $610/unit. We should expect this to fluctuate based on demand, availability, and currency conversion as we are dealing with a factory here.

https://www.ltbikes.com/index/products/view/id/421.html

EDIT: Now that these bikes are out in the wild, I have added comments in red

EDIT2: Adding content to this post to reflect some build hints and purchase configurations.

Things to consider when ordering this frame:
  • Sizes S, M, L, XL, and XXL are now available to order and appear to be shipping to customers. This is an expansion of the range, as originally only S, M, and L sizes were offered. Alisa at LTK indicated that they needed to see demand before they expanded the offering, so it seems like we were successful.
  • Speaking of Alisa, her contact is: longtengalisa@163.com. You can also contact her through the contact fork at LTbikes.com.
  • You can also find a similar site Longtengbike.com, which leads you to Rex who is active on this forum.
  • The frame is also available from Permants as the ST-09, Tideace as the CR266-D, and Haideli bikes as the CR266-D. Eddy from Haideli is also here on the forum.
  • Per above, it seems like sourcing an FSA ACR No 55R LS headset is probably something you should do. FSA also sells the following headsets that are similar; FSA ACR No 55R STD (compatible but uses a different upper bearing, has slightly less internal space than the LS and cant quite do as tight of a hose bend as the LS), FSA no. 69 SRS (Compatible), FSA no 69/DUAL/56 SRS (not compatible, i think).
  • LTK does sell an integrated barstem, but given current reviews, you are strongly advised to purchase a different bar. The LTK integrated barstem appears to use a proprietary spacer stack (poorly made and heavy). The barstem is also ~100g heavier than competitors in similar sizes, and there are doubts regarding the supplied bearing and C ring. Alternatives in this thread include the Tavelo Avro (@klrdd's build) and the XMCS one-piece (@BeeMC's build). The latter might be attractive because it does not require an adapter to interface with the FSA ACR headsets.
  • My own build uses a two-piece bar and stem. The obvious choice here is the FSA SMR stem, but it is a bit heavy for a build like this. There are custom options available to integrate in lighter stems, incl. the Kalloy Uno, with this frame.
  • Based on the contents of the thread so far, it seems prudent to order from LTK, the frameset + thru axles. This will come with one SL UDH hanger, an FD mount, both 7mm and 9mm saddle mount hardware, and an integrated seat post wedge.
  • The standard clear appears to be tinted dark to hide some of the rough areas. On request it appears you can order a "clear clear" vs. the standard "black clear." Not sure what to make of this, but its likely informative to folks who want to get that "raw carbon" look.
  • This frame does NOT include a Di2 battery mount. @Oker_s as a 3D printed solution and he as offered the .stl file to interested folks. I also believe the larger size Shimano one should work.
  • An alternative seatpost clamp cover that fits aesthetically well is the one for the 2021 Giant Defy. Part No. 1724-SPSHIM-901. The cover looks great on the front, but it has additional overhang on the rear. Most people would consider this to be a significant upgrade over the original. Credit to @Oker_s for the find. A second alternative is to print one out of TPU. An STL file with my design is attached to this post.
  • If you need to block up holes in the frame (e.g., the mechanical FD cable opening), I strongly recommend Tesa's Sugru. It's cheap, easy to mold into a plug that looks good, and removable with a pick or a set of tweezers.
  • While some of the supplied accessories and rubber parts are low quality, the overall frame is high quality, and the few that are built have very impressed owners. Hopefully, more will be built and ridden, so we can see if this frame really belongs in the conversation for the best open-mold road frames available.
Build Inspo from this thread:
"Official" build from @Eddy-haideli. Size S


@bedampft DuraAce Di2, "Mixtape" vinyl wrap, and Giant Contact SLR Bar + Stem. Size L


@sakizashi SRAM 1x Rival E1/D1 mix all-road build w/ kalloy uno stem and Hope RX2 calipers. Size M


@klrdd Sram Force E1 AXS roadbuild w/Tavelo barstem. Size L


@BeeMC Lightweight Sram mix w/ XMCS barstem. Size S


@TidyDinosaur Flyweight sub-6.2kg build with Avian barstem. Size S


u/sundayvacation from r/chinesecarbon. AXS mix, LB Aria wheelset, Tavelo barstem, Pantone Warm Grey 8C paint. Size M


@Halfshark Di2 build w/ riser barstem. Size M


@MARIOVL Permeants St-09 Di2 build. Size S


@alexgaignard Di2 build with LTK barstem and AeroRaptor Wheels. Size M


@OGLuka, Di2, Magene TEO carbon crankset, Light Carbon HBR17 barstem. Size XL

June 29, 2025, 12:36:26 AM
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Re: CT Scan Project: Real Frame vs Replica – Next Step I think he‘s trying to say that you’ve made your point many times now across different threads. And I too fail to see why we need yet another one. Some might find your endeavour interesting enough to support you. Others don’t.

I personally think that scanning one or two frames from one source and comparing it with the original might be of interest for owners of that particular frame. But I don’t think it brings much value to anyone else beyond that. We can’t draw any general conclusions from it. Arguably, it might not even give us any information about the general quality of TanTan frames because everything we know indicates that they’re sourcing it from elsewhere. I think it is what it is: You buy a replica of unknown origin means you take a risk.That’s not really gonna change no matter how many frames we’re scanning.

June 29, 2025, 10:10:39 AM
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Re: Zen Carbon Wheelset Build – 40/45 with Carbon Spokes, H-Works HX Hubs, Sub-1kg I spoke with Zara from Zen—she may be posting on the forum soon. But for anyone interested in the meantime, here’s some useful information:
   •   ✅ Rim specifications, including rider weight limits and individual rim weights
   •   ✅ Carbon spoke weights
   •   ✅ Example pricing for a 50/60 mm wheelset

These wheels are built with the H-Works SR270 rear hub
https://h-works.cn/products/hw-261-rear
3.95 mm or 5 mm carbon spokes, offering a high-performance, lightweight setup ideal for road disc builds.
Price varies obviously depending on rim carbon type
Shipping is offered with taxes but you will need to contact for prices for your own country!
https://www.instagram.com/zencarbonbike?igsh=bGtvdDcxdzVxMzA0

https://zencarbonbike.com

info@zencarbonbike.com

WhatsApp
+86 15160726618
+86 13218277787

June 30, 2025, 03:43:54 PM
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Re: Zen Carbon Wheelset Build – 40/45 with Carbon Spokes, H-Works HX Hubs, Sub-1kg
Order placed, cheers for all the hard work on these Sander!

Hey Justin

No worries always happy to help fellow forum members   :D

July 01, 2025, 12:24:17 AM
1