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Re: Juin Tech GT-F brake calipers (dual piston)
Quote from: planet_sammy on May 19, 2022, 05:04:48 AM
„TraceVelo“ has noted in his video comparing that the disc-brakes on the cheap models is no rubber seal at the transition from the brake arm to the brake piston but there’re included in the Juin Tech F1…

Are the BR-05 brakes from Oniri with or without rubber seal?

Some update from my side since I put some more Kms on the bike with the BR005s… all good so far but no wet weather riding.

The BR005s have the rubber seal as far as I can tell comparing to the old BR002s.
Comparing to the Juintech the BR005s need more cable pull for activation, however I have different break levers on the bikes…

I can definitely recommend  these breaks.

BR Chris
May 23, 2022, 03:09:46 PM 		1
Re: Juin Tech GT-F brake calipers (dual piston) Did anybody try replacing break pads on the Onirii BR-05 or Zrace BR-005?
Seems to me that the suggested Shimano G03S are too wide to fit?

I made the practical test and took out the existing pads and could not fit G03S compatible pads since they are too wide.
Instead I found a reference that the BR-05 / BR-005 uses Brake Pads for SRAM DB1 DB3 DB5 SRAM LEVEL T/TLM.
Would like to try some other pads to see if break power can be improved.

Correction:
I measured the break pads installed in my Zrace BR-005 with following values: Height 29.5mm / Width 26.5mm / Pad only height 16.5mm
Result: Should be K04S compatible so ordered some Cooma BP944ExPlus-RS805 to try:
https://www.aliexpress.com/item/4000220934631.html

Here pictures of original pads on left and new Cooma pads on right:


After almost 1000km of comparing the Juintech F1 to the Zrace BR-005 the Juintech F1 clearly wins in terms of break bower and low heat fading.
So any improvements by changing the break pads would be a bonus.

BR Chris
August 07, 2022, 04:10:18 PM 		1
Re: Juin Tech GT-F brake calipers (dual piston)
Quote from: s3si1u on August 07, 2022, 06:23:47 PM
Maybe the braking performance would be much better on another bike where the cables don't run through the bars or headset...I should give them another shot on a bike that doesn't route cables like this, maybe on the gravel bike?

I can confirm your suspicion, paired with compressionless cable housings and non integrated routing (allowing gentle routing radius), the brakes feel excellent and offer great stopping power. With the Juintech F1's I am really happy but the BR-05 / BR-005 could need some extra bite, so other break pads are on the way to test.  ;D

BR Chris
August 08, 2022, 01:06:09 AM 		1
Re: Brake Cables for Hybrid Disc brakes for internal routing I also ended up with the expensive Jagwire cable housing and inner cables. Was fed up with experiments… My bikes are not routed internally so no issues with tight bends.

The big transformation in break power and feel came after changing the breakpads. The original ones that come with the BR-005 are useless. The break power is limited and they are wearing down fast with a lot of break dust, so I changed after 1000km… Now I use these from Ali:
BP944-RS805 (Cooma Ex-Plus)
https://a.aliexpress.com/_mtoRDvQ


The original pads on the left the new ones on the right:




So far I have 500km on the new Pads and it is a big improvement.

BR Chris
September 06, 2022, 08:02:12 AM 		1
Re: Chasing wind-GT20 OR Airwolf YFR045 carbon Gravel frames , any experience ? After my own build I was asked by a friend to build him one in matching size 52 and color of choice. This time using a full Shimano GRX groupset with Garbaruk cage for an extended gearing of 11-46.

The complete build came in at 9kg with 32mm tires and heavy steel casette and chain. The new owner is very happy with the result both in price and quality.

Here some pictures:








BR Chris
September 06, 2022, 08:43:39 AM 		4
Re: Brake Cables for Hybrid Disc brakes for internal routing
Quote from: ancientone on September 06, 2022, 10:53:43 AM
Is that BP944CF-RS805 ? I need to get a new pair. Joke was I was trying to ceramic coat my frame, and I think some of that leak onto the brakepads. LOL.. So not exactly braking now no matter how hard I press.

The original brake pads squeak very loudly when I brake and it "ate" into the disc rotor (Ultegra), so I'm kind of pissed.

Yes the 944-RS805 are the ones I bought.
Fitting size is 29.5mm x 16.5mm with a width of 26mm

BR Chris
September 09, 2022, 11:49:58 AM 		1
Re: Juin Tech GT-F brake calipers (dual piston)
Quote from: 1Sigma on September 12, 2022, 04:15:34 PM
Unfortunately not, I ended up selling the BR-005s.
From what I hear, they are similar to the Juin Tech F1s, which are the single piston version of the GTs.
If that is the case, it is fair to say the GTs are better but more than twice the price. But I would go out on a limb though and say I doubt the GTs are twice as good.

The F1s and BR-005s will work just fine for almost any type of riding and rider you can throw at them

My long term experience with the Juintech F1 vs. the Zerace/Oniri BR-005 are as follows:
Juintech F1's: Excellent braking power even at longer descents down Alpine pass roads with original break pads
Zerace BR-005: Weaker break power with original break pads, after changing to alternative resin break pads much improved... still a bit behind the Juintech F1's.
General recommendation: Make sure to use compreissionless break housings and prevent tight bends (internal routing) for good break power and feel.

BR Chris
September 13, 2022, 08:55:53 AM 		1
Re: TanTan Seraph TT-X34, FM639 or FM619 Nick 2000 just posted his experiences of the TT-X34 here:
http://chinertown.com/index.php/topic,3853.0.html

BR Chris
September 17, 2022, 04:30:06 PM 		1
Re: Does anyone have any info on this ONIRII hill clmbing frameset? Looks interesting but rather expensive and weight limit at 85kg....
Would be great to hear some first hand experiences.

BR Chris
September 19, 2022, 11:18:06 AM 		1
Re: Juin Tech GT-F brake calipers (dual piston)
Quote from: pinaataa on September 23, 2022, 02:16:34 PM
I bought the BR-03, after being very underwhelmed by the performance, I got myself the BR-05 for a better performance.

While I tried the brake in road setting (approx 500km) and they are ok, yesterday was my first proper gravel ride and required longer braking down FSRs for a longer period of time. I experienced quite a lot of fading at the end of the slopes where it seems the braking power reduces over time.

This with the announcement in the rotor discussion of the CD-01 and CD-02 that gets discontinued because of issues leaves me wondering if these semi-hydro/Onirii brakes are worth it, or if I should switch to a fully hydraulic groupset (either waiting for Sensah or going with SRAM), or start by switching to different brake pad/rotor combo (recommendation welcomed).

FYI, I have compressionless housing for the rear brake and normal housing for the front brake, and the conditions were very dry.

After longer use (1000km plus), I found the break power of the BR-005 to be lower compared to the Juintech F-1.
I also experienced fading especially in warm temperatures.... after changing the break pads to alternatives, the break performance improved consdiderably. I do not know yet if this also cured the fading on long downhills.

I changed to these Cooma break pads:


BR Chris
September 25, 2022, 11:32:03 AM 		2