Hey everyone,

I’m currently riding the Shimano GRX RX810 2x11 groupset with the CN-HG701-11 chain and the GRX 810 derailleur pulleys . My current pulleys have 11 and 13 teeth.

https://www.bike-components.de/de/Shimano/Schaltraedchen-fuer-GRX-RX810-11-fach-1-Paar-p88650/

I came across ZTTO derailleur pulleys and I’m wondering if anyone has experience with them and whether they’re compatible with the GRX RX810 groupset. Here’s the link to the ZTTO pulleys I’m considering:

"https://de.aliexpress.com/item/1005005753137032.html?spm=a2g0o.productlist.main.9.6ea3oCgVoCgVC6&algo_pvid=beefef99-1fba-4047-8852-b566be89b5f0&algo_exp_id=beefef99-1fba-4047-8852-b566be89b5f0-4&pdp_ext_f=%7B%22order%22%3A%221216%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21EUR%214.35%210.99%21%21%2133.44%217.65%21%40211b680e17416292493304109eabae%2112000034229276252%21sea%21DE%210%21ABX&curPageLogUid=dfxwtQ5PhBWH&utparam-url=scene%3Asearch%7Cquery_from%3A"

Are the ZTTO pulleys compatible with the GRX RX810 groupset? How is the shifting performance with them? Are there any noticeable differences or disadvantages compared to the original Shimano pulleys?

Looking forward to hearing your thoughts and experiences!

First Test Rides with the Tantan TT X 68 – Clipless Pedals, Comfort & Di2 Shifting

Hey everyone,

I’ve done two test rides on my new Tantan TT X 68, each around 30 kilometers. Here are my first impressions:

First Ride:
The goal was to get comfortable with the bike, especially since it’s my first time riding with Shimano SPD-SL (blue) clipless pedals.
I rode at a relaxed pace, did a few sprints, and tested the gear shifting.
Tire pressure was around 3.5 bar, and the ride was extremely comfortable.
Shifting issue (Shimano Di2 105): I had some trouble shifting to the highest cog – maybe I pressed the wrong buttons. Solution: I reprogrammed the button layout in the app → now the shifting works perfectly!

Second Ride:

I felt much more confident with the clipless pedals.
Tracked the ride with the Adidas Running App.
Tire pressure this time was 6.5 bar, still comfortable.
I’m very cautious in corners, as I want to avoid any crashes – especially with clipless pedals, it’s something new for me.
The first 15 km didn’t feel much faster than usual.
Pace: about 2:00 min/km (~30 km/h), estimated Zone 3 (FTP).
I have to push myself, but I can maintain the pace for a long time as long as I’m well-rested.
On the way back: After 15 km, a random cyclist appeared, and I was able to draft behind them.
Speed test: We held a pace of 1:45 min/km for about 2 km, and I was able to keep up very easily – even while chewing gum!

Comparison to the ROSE Backroad GRX810 EQ Carbon:

The Tantan TT X 68 feels significantly lighter and is a bit faster, especially in sprints – likely due to the clipless pedals and the overall sportier setup.
Design: The Tantan looks way better to me and has a very modern and sleek appearance. It stands out massively – and in a positive way! I’ve already gotten several looks and compliments for it.
Shifting: The electronic Di2 shifting makes the Tantan feel smoother and faster.
ROSE Backroad: My ROSE Backroad is definitely more of an all-rounder bike – with mudguards, a durable frame, and more suited for longer, more relaxed rides. I’d say the ROSE is better for versatile touring, while the Tantan focuses on a more sporty approach.

Opinion from the Bike Shop:
I also got the opinion of a guy at a bike shop. When he looked at the Tantan TT X 68, you could see that it really put a big grin on his face. I think that says it all.

What are the torques wrench for front and rear carbon rail saddle ?

Thanks.

these infos are from vivian tantan,
 
all Numbers in Nm

Seatpost             8-10
Bottlecage             4
Brake calipers  : tantan dont have info also spcialized doesnt have on their manuual , i recommend u to go with 4 - 6
Handlebar           6-8
Fork Expander     8-10
Through Axle    12-13
Saddle both front and rear   8-10
UDH/SchaltWer     4,5
headset bolt screw : also no official info it  is about -  1- 2 Nm till u have no play betewen fork and frame

beaware torque charts are little different from original sl8 page
example fork expander sl8 original is 5 NM

I’ve taken a few pictures of my bike as a reference. The gaps around the headset look pretty extreme in the photos (angle).

During installation, I didn’t have any issues, especially not with the compression ring (was flat). I tightened the headset bolt very lightly, around 1-2 Nm. The result is that there’s absolutely no play between the frame and fork – I’ve tested it by pulling both brakes and moving the bike back and forth.

The steering also feels smooth and easy, exactly as it should.

Everything "feels" as it should, as if the bike is functioning exactly how it was designed to.

Other forum Photos of Gap Issue i assume this are all original SL8

https://weightweenies.starbike.com/forum/viewtopic.php?t=172467&start=4740

https://weightweenies.starbike.com/forum/viewtopic.php?t=172467&start=4770

Looks nice! Could you tell the weight of your build (with and whitout wheels)? I'd like to know if I can make it 6,99 kilo with 11sp ultegra Di2 and 1230gr wheels

Also, what saddles are that? Do you know the weight of those? They look nice!

And last question: Is that color chameleon white, or pearl white?

sry mate alrdy builded the bike up   

 full build / sd2000 saddle  / without pedals / frame size 54 :                          7,175 Kg

Weight of the Saddle  SD4000  no bolts                                                             140 gr 
saddle link "https://www.seraphbikes.com/3d-printing-technology-honeycomb-design-breathable-full-carbon-fiber-road-bicyle-saddle-sd2000-sd8000-mtb-bicycle-gravel-saddle-p5826463.html"

u can definitly safe weight at

Tires:
my tires Conti ultra sport 3 ("budget training tires")  700 X 28C /                2x    295 g   
Innertube:  conti. butyl tube

Wheelset: titanium hub / Carbon spokes  /                                                         1305g
Link "https://www.seraphbikes.com/700c-carbon-wave-wheelset-50x28mm-disc-brake-gravel-carbon-spoke-1305g-ratchet-3654t-ceramic-titanium-color-hub-road-bike-wheels-p5847395.html"

colour is "Chameleon White YS9145" 

Di2 105 vs ultegra vs dura ace                                           

!!MY!! First initial quality impression

Bike Delivery Update

Hi everyone,
The bike arrived on Tuesday and was very well packaged. A lot was already prebuilt, and the handlebar tape is wrapped like a god—truly excellent craftsmanship!

The fork’s bearing cups were not greased but weren’t completely dry either; they were still somewhat lubricated. I decided to apply bearing grease myself. The bearing cups for the fork, both top and bottom, fit perfectly with no play at all.

The seatpost itself is perfect—the scale markings are precise, clear, and easy to read. The two saddles I ordered additionally also seem to be of very high quality. As for the bike assembly, it was very straightforward and easy to complete.

Regarding the drivetrain, well, it’s Shimano 105 Di2—it works flawlessly as expected (Japanese quality!). The bike came with a Shimano Ultegra bottom bracket installed, which is a great addition.

The wheels also seem to be of very high quality, with no visible damage and running smoothly. However, the rear wheel is slightly unbalanced. That said, this is a common issue even with high-end bikes, as seen in many YouTube reviews. You can hear it slightly from the freehub’s oscillating sound, but it’s not a major concern.

I’d like to note that all of this is just an initial quality impression. This is not a long-term test, nor has a test ride been done yet, as it’s currently snowing here in Germany—January is the coldest month of the year.

The handlebar does have a slight flex when applying force to both ends. However, I can’t properly judge this since I’ve never had a "true" high-end main-brand carbon cockpit before. It’s worth mentioning that this kind of force generates a very high leverage effect, so the flex might be normal.

The paintwork looks phenomenal, but here too, I can’t comment on its durability yet.

U Also get no Torque Charts.. I asked tantan via whatsapp and they replied immediatly

Teaser :
"my" ordered bike build is finished and rdy to ship.

Public video on instagram; https://www.instagram.com/p/DD9HWU2udrT/?hl=de

i also have received privat whatsapp photos of the bikebuild from tantan . I will post them when i get permission from tantan to post it here. Feel free to post your opinions.