Disc brake performance: etap HRD or Di 9170?

Discuss light weight issues concerning road bikes & parts.
dogrange
Posts: 26
Joined: Mon Sep 10, 2012 3:44 pm

by dogrange

dvq wrote:
TobinHatesYou wrote:
Fri Apr 06, 2018 3:27 am
morrisond wrote:
Fri Apr 06, 2018 2:00 am
By many reports Campy is probably the best right now for disc braking, then probably Shimano then SRAM.
The company with the first-generation product made for them by Magura is the "best?" Citation needed.

I can tell you at least one thing. H11 rotors are designed in a way that give no consideration to noise. The high number of evenly spaced vertical vents turn the brakes into WWII Carter air raid sirens (or Chewbacca.)

Mr. Wizard example with a hilariously dangerous circular saw: https://www.youtube.com/watch?v=Lsfczwy3KOE
Dura-Ace rotors are just as bad.
The Shimano rotors suck. The aluminum core makes them very soft and they go out of True under hard use and are very hard to bend back in a way that will stay. Steel rotors much better.


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jasjas
Posts: 131
Joined: Sun Aug 23, 2009 10:15 am

by jasjas

Would that level of heat discolouration be normal on those disks? are you dragging them alot/badly adjusted?

My Carbon tub or alloy clincher rims do not even get particularly hot on a 10k descent in the Dolomites.

TobinHatesYou
Posts: 1053
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

jasjas wrote:
Sat Apr 07, 2018 9:07 am
Would that level of heat discolouration be normal on those disks? are you dragging them alot/badly adjusted?

My Carbon tub or alloy clincher rims do not even get particularly hot on a 10k descent in the Dolomites.

It's pretty normal. The rotors are reaching the very low end of tempering range...about 200C. DOT 5.1 boils at 260C. The pistons aren't reaching 200C and neither is the fluid. Now if your rotors turn blue, then I'd start to worry.

https://upload.wikimedia.org/wikipedia/ ... ithing.JPG

dvq
Posts: 68
Joined: Mon Sep 25, 2017 1:36 pm

by dvq

morrisond wrote:
Sat Apr 07, 2018 2:50 am
That does look like pretty good coverage on the Rotor - Weird.

You will love RX4's - they provide the power you think you should get from Hydro's.

I'm building another bike with H11's and Campy Rotor's/Calipers so I should be able to compare.

I had two bikes with Shimano Hydro - very nice but I was underwhelmed by the braking power.
Ordered a set of RX4s after reading your post. I haven't been unhappy in the slightest with SRAM eTap HRD, I'm just willing to try something. I've been on the fence for a while just because I have no qualms with it and that it would require me to route new lines internally again.

hkgmatt
Posts: 1
Joined: Sun Apr 08, 2018 9:17 am

by hkgmatt

dogrange wrote:
Sat Apr 07, 2018 5:50 am
The Shimano rotors suck. The aluminum core makes them very soft and they go out of True under hard use and are very hard to bend back in a way that will stay. Steel rotors much better.
This is my experience as well. I'm running Dura Ace R9170 and I'm disappointed with brake performance generally, which I would say is on par with but not better than my rim brakes with aluminium Mavic wheels. The front rotor deformed after one of my first outings and needs replacing. I have not ridden the other disc brake options.

dvq
Posts: 68
Joined: Mon Sep 25, 2017 1:36 pm

by dvq

hkgmatt wrote:
Sun Apr 08, 2018 9:23 am
dogrange wrote:
Sat Apr 07, 2018 5:50 am
The Shimano rotors suck. The aluminum core makes them very soft and they go out of True under hard use and are very hard to bend back in a way that will stay. Steel rotors much better.
This is my experience as well. I'm running Dura Ace R9170 and I'm disappointed with brake performance generally, which I would say is on par with but not better than my rim brakes with aluminium Mavic wheels. The front rotor deformed after one of my first outings and needs replacing. I have not ridden the other disc brake options.
I've been happy with the sram centerline x rotors, make sure you bed them and pads aren't contaminated. Disc has been way more powerful than any alu rim brakes I've ever owned.

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