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Hope RX4 Calipers Gut Check

Old 04-18-19, 05:01 PM
  #26  
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Originally Posted by TimothyH View Post
This might have been my fault.

I've been posting that the E4 pads fit the RX4 calipers but didn't even think about SRAM vs Shimano.


-Tim-
Nah, nobody's fault but mine. I was referencing the wrong PDF file.
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Old 06-28-19, 03:02 PM
  #27  
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@TimothyH

How is this working out? Are the calipers an improvement?

How do they differ from mtn quad-piston calipers (like the new XT, or TRP)?
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Old 06-28-19, 03:16 PM
  #28  
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Best upgrade I've never done!

Here is a photo of how they look. They look so good that I might leave them right there for another few weeks or months or maybe a year or two.

Note the dust on the box...




-Tim-
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Old 08-20-19, 07:24 PM
  #29  
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Pretty frustrated right now.

Does anyone know what bleed kit to use with the RX4 calipers for Shimano?

The bleed port on the caliper is threaded and the instructions show a syringe with threaded fitting on the end of the hose.

Hope's website has zero information on what this threaded part is or how to get it. Their website shows no information on what bleed kit to use.

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Old 08-21-19, 07:53 AM
  #30  
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service@hopetech.com ?
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Old 08-21-19, 08:12 AM
  #31  
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Originally Posted by TimothyH View Post
Pretty frustrated right now.

Does anyone know what bleed kit to use with the RX4 calipers for Shimano?

The bleed port on the caliper is threaded and the instructions show a syringe with threaded fitting on the end of the hose.

Hope's website has zero information on what this threaded part is or how to get it. Their website shows no information on what bleed kit to use.


The installation PDF is kind of useless. I watched the you tube video and noticed it's a Sram style syringe they are using with the appropriate shimano mineral oil.

This is the kit I used for my Sram system when I installed my rx4 calipers and it indeed has the appropriate bleeding adapter with an M5 threaded end. Sram uses 2 syringes the bleed their brakes, this kit has 3 adapters, 2 of which are the ones you need. There are knock off kits around the internet that are cheaper. Maybe even your local bike shop has one to buy or rent for a few hours.

https://www.sram.com/en/sram/models/ac-dbs-bld-a1

https://www.jensonusa.com/SRAM-Standard-Brake-Bleed-Kit

Last edited by Bryan C.; 08-21-19 at 08:19 AM.
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Old 08-21-19, 08:56 AM
  #32  
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Originally Posted by 50voltphantom View Post
Yeah, already emailed Hope and my message is sitting in someone's inbox. Asking the internet is faster.


Originally Posted by Bryan C. View Post
The installation PDF is kind of useless. I watched the you tube video and noticed it's a Sram style syringe they are using with the appropriate shimano mineral oil.

This is the kit I used for my Sram system when I installed my rx4 calipers and it indeed has the appropriate bleeding adapter with an M5 threaded end. Sram uses 2 syringes the bleed their brakes, this kit has 3 adapters, 2 of which are the ones you need. There are knock off kits around the internet that are cheaper. Maybe even your local bike shop has one to buy or rent for a few hours.

https://www.sram.com/en/sram/models/ac-dbs-bld-a1

https://www.jensonusa.com/SRAM-Standard-Brake-Bleed-Kit
Thank you Brian.

M5 is what I read on another website.

I've ordered that kit. Hopefully (no pun) I can ride this bike soon.



-Tim-
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Old 08-21-19, 07:55 PM
  #33  
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Originally Posted by render ranger View Post
For future reference (in case this turns up in search results) it's also right there in Hope's RX4 Shimano instructions "Appropriate bleed kit (Shimano funnel and bleeding syringe with M5 end)"
As one who does computer work and spends half his day reading technical documentation, you would think I would know enough to slow down and actually spend more than three seconds reading that section. But no, there it is, in black and white.

I'll even post a screen cap as a testament to my stupidity.



And thank you.
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Old 08-22-19, 08:33 AM
  #34  
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Originally Posted by TimothyH View Post
As one who does computer work and spends half his day reading technical documentation, you would think I would know enough to slow down and actually spend more than three seconds reading that section. But no, there it is, in black and white.

I'll even post a screen cap as a testament to my stupidity.



And thank you.
Don't feel bad Tim, I had similar results when reading Hope's technical PDF files.
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Old 08-22-19, 09:34 AM
  #35  
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One of the pistons is stuck in the bore and won't budge.

Really disappointed in these POS.


-Tim-
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Old 08-23-19, 11:26 AM
  #36  
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Originally Posted by TimothyH View Post
One of the pistons is stuck in the bore and won't budge.

Really disappointed in these POS.


-Tim-
Update?
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Old 08-23-19, 01:42 PM
  #37  
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Tried to push the piston back but it won't budge. It is useless.

The front was installed, bled and ready to go. The rear had the hose run, caliper attached and was going through the bleeding process. It was all a complete waste of time.

Good thing I left the hoses a little long so that the Hope barbs could be cut off. The Shimano calipers went back on.

I'll see what Hope says about warranty. I know people like these things but I have a 50% failure rate and people on other forums say that got two in a row like that. I'll probably just sell them.
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Old 08-23-19, 09:52 PM
  #38  
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Originally Posted by TimothyH View Post
Tried to push the piston back but it won't budge. It is useless.

The front was installed, bled and ready to go. The rear had the hose run, caliper attached and was going through the bleeding process. It was all a complete waste of time.

Good thing I left the hoses a little long so that the Hope barbs could be cut off. The Shimano calipers went back on.

I'll see what Hope says about warranty. I know people like these things but I have a 50% failure rate and people on other forums say that got two in a row like that. I'll probably just sell them.
I hate it when a so called upgrade doesn't live up to the hype.

My experience was the exact opposite as the Sram brakes seemed weak and the new calipers made a big improvement.

However from my own experience, the Ultegra brakes with resin pads on my road bike stop better than my Sram Force with the RX4 calipers. The Shimano stuff works so well I would be hard pressed to change it.
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Old 08-23-19, 11:52 PM
  #39  
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Feeing like an Amazon review up in here— one single item doesn’t work, so the entire company must be a farce. I’ve had FOUR Maxxis tires go back for warranty replacement. Doesn’t mean Maxxis is inherently flawed. I literally just mounted another Maxxis tire about 4 hours ago.

And of course, counterpoint from my perspective— my RX4 calipers have been flawless since day one. But I also bought mine at my LBS, so if one had arrived DOA, it would have been replaced within a few days.
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Old 08-24-19, 06:17 PM
  #40  
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Originally Posted by DrIsotope View Post
Feeing like an Amazon review up in here— one single item doesn’t work, so the entire company must be a farce. I’ve had FOUR Maxxis tires go back for warranty replacement. Doesn’t mean Maxxis is inherently flawed. I literally just mounted another Maxxis tire about 4 hours ago.

And of course, counterpoint from my perspective— my RX4 calipers have been flawless since day one. But I also bought mine at my LBS, so if one had arrived DOA, it would have been replaced within a few days.
You are as predictable as the sunrise.

50% failure rate is enough for me but I'm not the only one having this problem.

https://weightweenies.starbike.com/forum/viewtopic.php?t=146254&start=30

Rubbing salt in wounds. How the **** did they ever make you a ******g moderator.


-Tim-
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Old 08-24-19, 06:34 PM
  #41  
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@DrIsotope - Tim's been an honest player in this experiment, IMO.
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Old 08-24-19, 07:45 PM
  #42  
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Originally Posted by TimothyH View Post
Rubbing salt in wounds. How the **** did they ever make you a ******g moderator.


-Tim-
Hi Tim! *waves*

Just to answer your question, our team decided to summon his help as a moderator due to his flawless loyalty to the membership, his even keeled temperament, his politeness to others, the fact that he does not judge others for any shortcomings they may have and for his helpfulness to the community no matter what.

He's also got a spotless infraction record.

If there is a problem with any of my team, please contact me. If you feel that you have been treated unfairly, I will not tolerate that and will address the issue immediately.

I also invite people who feel they are up to the job of volunteering their personal time here to help out others in education and sharing, then by all means, please contact me in that regard if you want to give back to the site that you've been frequenting at no cost to you.

Looking forward to your pm!

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Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.
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Old 08-25-19, 09:04 AM
  #43  
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A good moderator never has gear problems and includes how many miles on that perticular gear, as well as total monthly and yearly mileage on gear, bike, shoes, kind of shoes and how they smell.
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Old 08-25-19, 04:47 PM
  #44  
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with dura ace 9170 calipers super cheap on eBay why do people paying so much more for 3rd party calipers that may or may not work. Just got a pair in mint condition for $90. Saved 40g over 8070 calipers
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Old 08-25-19, 11:11 PM
  #45  
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I imagine part of the reason is that SRAM uses DOT fluid, which rules out any and all Shimano calipers.

If weight is your overriding concern when it comes to braking,
flat mount Shimano 9170 caliper, 123g
flat mount Hope RX4-SH caliper, 109g
flat mount Hope RX4-SR caliper, 93g
...and the post-mount versions are even lighter.

I personally don't care what it weighs. Any weight savings are a nice bonus.
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Old 08-26-19, 08:23 AM
  #46  
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Originally Posted by DrIsotope View Post
I imagine part of the reason is that SRAM uses DOT fluid, which rules out any and all Shimano calipers.

If weight is your overriding concern when it comes to braking,
flat mount Shimano 9170 caliper, 123g
flat mount Hope RX4-SH caliper, 109g
flat mount Hope RX4-SR caliper, 93g
...and the post-mount versions are even lighter.

I personally don't care what it weighs. Any weight savings are a nice bonus.
are those weight with or without pads?
mine 9170 caliper measured 92g w/o
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Old 08-26-19, 08:30 AM
  #47  
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The listed weights for the Hopes include pads.
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Old 08-26-19, 11:41 AM
  #48  
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Originally Posted by DrIsotope View Post
The listed weights for the Hopes include pads.
looks like the shimano finned pads really weighted it down. the rear RX4-SH measured to be 85g

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Old 08-27-19, 11:14 AM
  #49  
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Don't see the problem. Just call Hope USA and they will send you a new caliper. I would be *****ing and screaming if they told me to pound sand but that doesn't seem to be the case.

But then I realized this is a Tim thread so par for the course.
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Old 08-27-19, 07:42 PM
  #50  
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Originally Posted by render ranger View Post
I'm pretty sure Hope USA wouldn't be able to help him.

He bought the calipers from Merlin (UK dealer). US stock continues to be spotty.
Merlin is also very good at honoring warranty, even offers to reimburse return shipping from US to UK
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