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Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
Quote from: Jack Russell on May 16, 2025, 03:03:27 AM
good morning everyone, i'm new to this forum and since i'm also interested in this x68 frame i wanted to ask those who own one if they would buy it again and if they consider it safe after reading that some users have had problems with seat post, fork and frame. thanks to anyone who can advise me.

i and welcome to the forum!

Great to see you doing your research before committing — it's smart, especially with a frame like the X68 that’s generated some debate. You mentioned concerns about safety, and I’ll try to share what I know and my own experience.

Yes, there have been a couple of reported issues — one fork failure and a minor crack in a seatpost. That said, I’ve also had failures on premium components: a €400 Gelu seatpost cracked within torque spec, and a Felt carbon frame cracked at the seatstays. These things unfortunately aren’t exclusive to lesser-known brands.

TanTan, the manufacturer, claims their products undergo ISO 4210-compliant testing (impact, fatigue, vibration), but they don’t provide detailed test results or even basic sales figures — which makes it hard to put the reported failures into perspective. I asked for sales numbers to do a rough risk estimate, but they understandably didn’t provide them. So yes, I was probably clutching at straws there.

Based on what I’ve seen and experienced, I personally still consider the frame reasonably safe — for me. But I completely accept that others may have deeper technical knowledge or different standards, and they may reasonably come to a different conclusion. Risk tolerance varies from rider to rider, and in my case, I’ve weighed the pros and cons and made a decision I’m comfortable with. Others may (and should) make their own judgment based on what level of risk they’re okay with.

Hope that gives a bit of perspective — and definitely feel free to reach out if you decide to go ahead or want
May 16, 2025, 04:33:32 AM 		1
Re: LTK266-D-SL
Quote from: Tpower59 on July 10, 2025, 12:50:06 AM
Every message you post is about your LT268
I want one now  ::)

I think you mean half are about Longteng Bikes, and the other half are about XMCarbonSpeed  ;D
July 10, 2025, 01:06:25 AM 		1
Re: Seraph Bikes Superlight 836g X68 - Alternative to SL8 Fakes?
Quote from: Tpower59 on July 13, 2025, 02:49:17 AM
Hi guys ! Any fix for creaking noise in BB when loading
I removed the crankset, pedals, greased everything.
It worked for about 200 km. Now the creaking is coming back when pushing hard.
Do you recommend removing the BB or replacing it all ?

I saw people using pipe tape, could be a solution
July 13, 2025, 05:11:53 AM 		1
Re: BXT SL-115 Chill out guys. It's my bike, and I'll do whatever I want with it.
July 19, 2025, 10:13:54 AM 		1
Re: Xiamen Carbon Speed 10 years anniversary special promotion
Quote from: pandinoyoung on July 29, 2025, 04:12:29 AM
Communication-wise, I'd say it's pretty terrible.
I ordered wheels with carbon spokes, paid on July 10th. I received a PayPal notification that the payment had been made, but nothing else.
I don't know, an email to confirm they'd received the payment, a thank you for choosing xmspeed, and the build time. Nothing.
They don't respond to Allen's email. I asked Peter for information before buying them, and he responded fairly quickly, with a rather hasty response.
I read about excellent communication, but in my case, it was pretty tragic.

I'm giving them negative feedback.

p.s. On July 29th, I made a payment of $1,000 to a name called XM Carbon Speed. I'm not entirely sure if there's a spoof website behind it, and I just clicked in the wrong place.

Quote from: pandinoyoung on July 29, 2025, 08:10:51 AM
If Peter is the only one who works at xmcarbon speed, and makes the rims, assembles the wheels, puts them in a box, ships them, handles the correspondence, marketing, etc. etc. then I'll keep quiet. But what company are we talking about then? He must have a couple of collaborators who are behind a computer, right? And what do these collaborators do during the day? It's the wrong method, communication is lacking. I'll leave aside the discussion of frames and cranks always branded xmcs, which are present on this forum with photos and prices, but don't exist on their website.

Firstly thanks for your emails, inquiries. But if possible please do not send emails to both me and Allen, that may confuse us and make your order more time to take due to misunderstanding or ineffective communication between us. Since we normally take care of personal direct clients of ourselves who contact me only or Allen only, and Allen is in charge of all direct orders on our website xmcarbonspeed.cc, my email is there, my WhatsApp is there, you can get in touch with me any time if you had any questions.

Secondly I just had my newborn yesterday, it has been crazy busy time to me recently. So it would be better contact me via WhatsApp this time period. Allen has been affected by my family business too, He has to take more time on our company business. I don't have many collaborators currently because I just trust my men who do only right things. Please give us a little bit more time and be a little patient, your order has been arranged correctly for sure. Sorry about less communication from Allen.

Thirdly yes we are making many items and our old customers know that we haven't listed everything onto our website because many of them are new items, we are factory and we need to guarantee the quality first before we list them officially onto website.

Thanks for your understanding, and again, sorry about the inconvenience.
July 29, 2025, 09:46:26 AM 		1
Re: Long Teng / Mondince aero frame FM126 Indiegogo
Quote from: Tpower59 on August 12, 2025, 09:56:48 AM
Almost ready to pull the trigger
Isn’t Indiegogo helping you to get a refund if the project isn’t fulfilled ?

Any of these kind of backing programs carries risk. While Indiegogo might offer refunds prior to the closure of the campaign, beyond that its up the the organizers of the campaign, and while they might make every promise in the world now, they aren't actually held to anything and this could change in the future.

I have had some products from Indiegogo that went very well, but these products were pretty much fully ready by the time they created the campaign and it was more for marketing. Others where the product looked pretty close to ready and now here we are 2 years later where they now refuse/don't answer refund requests, are missing all the incredibly late targets they set for themselves and it feels likely the company will just dissolve before the products are actually delivered.

If you aren't ok with risk it would be better to wait for the product to be delivered, reviewed and then you can decided if it is worth it, albeit you will likely pay more.
August 12, 2025, 08:23:23 PM 		1
Re: Replica Factor Ostro VAM Li at Polar, like most sellers, claims to have the best quality frames. And they have only kits started selling that Ostro after finishing its ‘development’.


A few people on the forum have bought his SL8, and the finishing looks excellent—the frame weights are also very close to the genuine version.
The frames come with a copy Darimo seatpost and bar.

I purchased the Nexum Drag copy and can say the quality is also very good. However, one issue I found was with the stem bolts: they’re aluminium, and the head of one snapped during installation. Aluminium isn’t great for bolts, so I swapped them for titanium. I was offered replacements but declined, and suggested they consider using steel or titanium instead.

One other point worth noting: Polar and RK Ultra—also trading under the names Mirror Carbon Fibre and First Class—are actually sourcing their frames from the same place.
August 20, 2025, 04:59:59 PM 		1
Re: Long Teng / Mondince aero frame FM126 Indiegogo
Quote from: Serge_K on September 05, 2025, 04:45:31 AM
No can do unfortunately :)
I tried :D
And I agree. The somewhat low stack is the one reservation i have about it, but i also know i can work around it.

The 35C though is confirmed, and it's a huge positive.

Edit: bike fit shenanigans, in case it's useful for others.
The one thing i wish were different on this FM126 is the stack: wish it were higher.
Who doesnt like trigonometry on a Friday?
I'm on a LTK268 M, so vs the FM126 in M, the 126 is 2mm longer and 8mm lower, which i dont love. I went from 80 stem to 100 on the 268. From 126 M to L, stack is up 21mm, reach is up 11mm, and seat angle is 0.5 degree slacker, which at my saddle height is 7mm further back, which i dont love either (I ride on the flat mostly so i slam my saddle fwd by default.
So, if i go from 126M to 126 L, you're up 21mm in stack, and 18mm in reach (11 + 7 from the saddle). If i drop back to 80mm stem, then i'm back to square 1, but i gained 21mm in stack. Which then allows me with a full spacer stack to be significantly higher (my saddle to bar drop is pretty epic). 268 M to 126 L is 20mm longer (13+7) and 13mm taller. So i can drop back down to 80mm stem and get an L. Also, they will be making a zero offset seat post, so i'll get one of these on top of the regular one. I'm going to have so much seat post exposed compliance wont be a problem, especially on 32C measuring 34-35mm. If i do that, i will be able to play with the "higher stack is faster when in tuck" vibe.

If you understand anything, bravo, because i dont.
I THINK that M to L in the 126 is basically reach neutral, you gain 21mm stack, and your hip angle should open up. Even more so with a 0 offset seat post. So I guess i'm leaning towards an L. For reference, i'm 184 and my saddle height is 80-81cm. I also plan to switch to 165mm cranks, which should open up my hip angle even more. Might be worse off in the mountains, but so much of my riding is on the flat, i'm solving for that.

Adding a 10mm spacer on the M should be close enough for you to make no changes. I think you are already doing this, but it's important to remember that adding spacers adds stack AND reduces reach. Because of this, the L is ~17mm longer than the M (if I am reading the sizes right) at the same stack height.

Your bike fit is super old school, so IMO the question for the L is more about whether or not you wanted to try a more modern position which would require more or less a total refit, as you likely need to change your saddle position for that size to work. However, I think that it would be worth it for you. Ideally, you could find someone with a bike that size to try riding with or get on a fitting rig and see how it feels, both JRA and when doing a hard effort.
September 05, 2025, 10:17:33 PM 		1
Re: Replica Factor Ostro VAM Hello everyone.
New in this forum, I wanted to share my (extensive) experience.
First of all, counterfeit bikes are often talked about as being dangerous, etc... but they're no more dangerous than generic bikes. The important thing is to choose your supplier carefully. why a generic frame will be good and the same generic with brand sticker bad ?  ::)
I've been riding generic and then counterfeit bikes for over 15 years, (around 7000 km/year) => about 150000km I've never had any problems (I've had two generic bikes, then an SL3 (3 years), 2 Venge (2016-19-2022) and other bikes
PS: The design (the shape of the bicycle) is not registered. It is the trademarks and logos that are registered.
my 2 Venge come from Eisen (but actually the seller is no longer responding, whether via WhatsApp, AliExpress, or their website.  :'( )

I'm looking to buy one other, the Factor appeals to me. I've contacted quite a few suppliers...
October 30, 2025, 02:24:38 PM 		1
Xcadey GEN 2 - power sources comparison I finalized my testing of three power meters. It took place from 16.12.2025 until 06.01.2026. All screens and readings of power were made on https://compare-the-watts.com/. All files you can find here - https://drive.google.com/drive/folders/1zK7ZtPF-K969JV58sm26zGjgVzL1gek8?usp=sharing. Some photo examples I attached in the post. I will add some videos into the google drive, from rides and showing the calibration etc. Comparison is also on Facebook group - https://www.facebook.com/groups/975602387895509/?ref=share.

The tests and all workouts were recorded on: Garmin Fenix 8, Huawei Mate tablet and Bryton S810. The following devices have been compared:

1.   Favero Assioma Duo, used since 2021 (4.5 years)
2.   Elite Justo, used since 2023 (almost 3 years)
3.   Xcadey gen 2 easton 110 BCD (almost new)

Before every ride sources 1 and 3 were calibrated as Elite Justo is self-calibrated device, however, two times it was also calibrated and before all tests. The firmware for all devices has been updated, and it is the newest possible. All the data is on my google drive including all original fit files for all dates. Unfortunately, several times I had some issues, it was not related to connection or to any power source but the recording device ( I believe). Sometimes it was due to changing windows on my tablet and then My Whoosh device turned off the training, or I wanted to change recording device, and switch to another source.
During the testing period so for full three weeks which include many different workouts all sources showed rather consistent results, and the results were not identical of course. However, some unexpected episodes also happened, which I describe below:

1.   For each workout, for each day you can find fit file;
2.   For each workout you can find general screen and some detailed comparisons for the interval part if occurred;
3.   Except for the FTP test from 03.01.2026 all workouts have been done using ERG mode;
4.   For one workout I switched, and the Bryton S810 was a controllable device of the smart trainer. For most of the time the Elite Justo controlled the watts and workout in ERG mode;
5.   Screens are from Compare the watts;
6.   Sometimes the workout timeline is moved, that is due to the different methods of pausing the activity for each device, mostly the MyWhoosh (elite justo) recording is moved. I adjusted it in the Compare the watts by time offset, and the detailed comparison is correct. Due to that, the average watts for the entire workout are different and not correct. Then the interval part can be compared;
7.   For Favero and Xcadey there are L/R balance data;
8.   Sprints are much better recorded on Favero and Xcadey, and showed more reliable watts;
9.   The maximum data from Compare the watts and recorded in the file is different for Favero and Xcadey;
10.   I noticed different readings of watts during workout for all devices, for all of them I have 3s average watts so that should not be the case;
11.   I identified some issues with displaying watts, I connect Xcadey and Favero to Garmin Fenix 8 and to MyWHoosh and it presented different readings;
12.   I connected Xcadey as power source to mywhoosh and Elite Justo as controllable device for workouts in Mywhoosh, and the watts were displayed different on the Mywhoosh, and different on Garmin Fenix 8;
13.   Favero and Xcadey are more sensible and reads all  fluctuations of wattage more reliable;

The results overall:

1.   Are consistent for all power sources, the graphs, watts and the cadence recorded are not identical but similar;
2.   The comparison to other sets is always different, never been the same and within 1%, between the sources;   
3.   The graphs are very similar, Favero and Elite Justo are closer, and the GAP is probably around 1-5%;
4.   The GAP for Xcadey is bigger, around 1-6%, except for two days 24-25.12, were I noticed some serious issues for all devices, the readings on all devices were strange,
5.   The watts recorded and presented by Xcadey are always higher, around 5-10w from Elite Justo;
6.   The maximum watts are much lower on Elite Justo and certainly not accurate;
7.   Based on the workout assumptions, Elite Justo was in a lower or middle range of watts required, Favero Assioma was always below, Xcadey always met the requirements,
8.   Favero and Xcadey L/R balance are very similar, the differences are very low;
9.   I have different FTP based on the results obtained from all devices, between 352, 357 and 362w;
10.   I charged Favero and Xcadey 16.12.2025 and today so 14.01.2026 the batter level is 10% (Xcadey). During that period, I rode more than 50h. However, the readings are not representative as my son (1.5 years) loves to spin the pedals, and the Xcadey was very often activated, even when Favero was not installed,
11.   On the 12th of January I decided to swap pedals, and I installed Favero on my second bike. For me the results of Justo and Xcadey are reliable and enough. I just adjusted my FTP for the readings from Justo and Xcadey. 

Riding for around 4.5 years with a power meter I still don’t know which is the most accurate one from those three, however I have one conclusion from my side. If you use power meter, perform all tests on it, that is crucial, and you should stick to it. If you change power meter, you always should perform a new FTP test on it. Even if it shows some lower or higher watts, you will have the proper and valid readings. I didn’t notice any unusual results so one showed 400w and another 600 w, except sprints, for sure that is the biggest flaws of a smart trainer due to their build and way of working. I also noticed that the feeling of 200w outside is a bit different than inside using all three devices. After all rides and tests, I would say that the watts are in the middle. I will repeat it when the weather will be more convenient in Poland. Lastly, my Favero Assioma now has some issues with the body, I changed the bearings but now I felt some play, again. It was noticed by many people in the past.

If you have any suggestions/comments/questions, I’m happy to answer.
January 14, 2026, 04:46:03 AM 		1