Let's talk rotors

Discuss light weight issues concerning road bikes & parts.
skyliner1004
Posts: 121
Joined: Sat Jul 10, 2010 6:38 am

by skyliner1004

My bike came stock with DA hydrolic disc's 160/140.l centerp9ck rotors. Is it possible to change the rear to 160mm also? Is it simply a "unscrew the 140, screw in the 160?"

Also vice versa, if one wanted to change the front 160 and buy a lightweight 140 or an OEM DA 140 rotor, would it fit?
2018 Supersix Evo Hi-Mod Disc Dura-Ace
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3t Ernova Team
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by Weenie


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ryanw
Posts: 1184
Joined: Sat Apr 16, 2016 6:52 pm
Location: London

by ryanw

skyliner1004 wrote:
Thu Jul 18, 2019 3:08 pm
My bike came stock with DA hydrolic disc's 160/140.l centerp9ck rotors. Is it possible to change the rear to 160mm also? Is it simply a "unscrew the 140, screw in the 160?"

Also vice versa, if one wanted to change the front 160 and buy a lightweight 140 or an OEM DA 140 rotor, would it fit?
You would need to add an adapter / mount to change from 140 to 160, front or back. If it already has an adapter, sometimes you can just flip it to accommodate the larger / smaller rotor.
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LiquidCooled
Posts: 217
Joined: Mon Oct 02, 2017 5:46 am

by LiquidCooled

Most likely, you have an adapter on the front already. It’d be set to 160, so you could flip it to the 140 setting. The rear likely does not have an adapter, so you’ll have to buy one to use 160 in the rear.

I’d keep the 160 on the front if I were going to use a 160 and 140 combo. My bike came with 140s front and rear. I changed both to 160.

Edit: To be clear, with flat mount brakes, typically, the front always uses an adapter. The front adapter has a 140 position and a 160 position. Depending on which you want, you orient the adapter accordingly. On the rear—again typically—there is no adapter necessary for 140. For 160, you have to use an adapter. The front and rear adapters are obviously not the same.
2017 Giant TCR Advanced Pro 0 Disc
2003 Cannondale R1000 (CAAD7)

angman19
Posts: 25
Joined: Fri May 26, 2017 8:01 am

by angman19

I use SRAM etap right now and brakes have too many issues with noise. Possible to use the XTR rotors with my sram system?

angman19
Posts: 25
Joined: Fri May 26, 2017 8:01 am

by angman19

I use SRAM etap right now and brakes have too many issues with noise. Possible to use the XTR rotors with my sram system?

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wheelsONfire
Posts: 3824
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

Drag or squeal, bad retraction of pistons or uneven rotors?
I heard some whine about rotor drag in the front while sprinting?
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
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Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

jlok
Posts: 1402
Joined: Tue Jun 30, 2015 3:30 am

by jlok

angman19 wrote:
Wed Sep 02, 2020 5:52 am
I use SRAM etap right now and brakes have too many issues with noise. Possible to use the XTR rotors with my sram system?
I'm using the XT rotor with old monoblock and new two-piece calipers, and guess XTR would be working fine the same.
Rikulau V9 DB Custom < BMC TM02 < Litespeed T1sl Disc < Giant Propel Advanced SL Disc 1 < Propel Adv < TCR Adv SL Disc < KTM Revelator Sky < CAAD 12 Disc < Domane S Disc < Alize < CAAD 10

TobinHatesYou
Posts: 6627
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

angman19 wrote:
Wed Sep 02, 2020 5:52 am
I use SRAM etap right now and brakes have too many issues with noise. Possible to use the XTR rotors with my sram system?

Details?

Whatever issue you have with the SRAM rotors, I doubt will be solved with Shimano rotors.

eljamoquio
Posts: 94
Joined: Fri Oct 26, 2007 1:26 am

by eljamoquio

Karvalo wrote:
Fri Mar 08, 2019 8:53 am
And yet I've never seen a road bike with 203mm rotors :wink:
Admittedly not 203mm, but my road bike *does* have 622mm rotors.

edchristoph
Posts: 13
Joined: Sun Aug 18, 2019 10:40 am

by edchristoph

ryanw wrote:
Wed Apr 10, 2019 11:35 am
I think they look better than the DA 9100 rotors, and they weigh 22g less combined (160/140mm):

Image

Image
I was using that exact combo for quite some time and while they look better and weigh less than the the DA rotors, I was neither happy with the aesthetics nor the performance after all.

When it comes to aesthetics nothing comes really close to the Campy rotors IMHO.
640d1879ce66efb7519955221dba059e.jpg
I was very tempted to give them a try, but the discussion around here (viewtopic.php?f=3&t=145230&hilit=campag ... 0#p1521713) concluded that the don't mate well with DA calippers which kept me from doing so.

After watching a GCN tube on André Greipel's new Factor One bike from ISN team (https://www.youtube.com/watch?v=3Jcg2eHeppk&t=253s) I was quite attracted by the look of the Swissstop Catalyst discs which the team is using in combination with DA groupset. And if they are good enough for André they will be good enough for me...

I currently use them in 140/160 size in combination with the Swissstop 34 RS pads. I like the look much more than the XTR rotors and I am very happy with the performance, too. Good braking power and modulation, very silent (no squealing or similar Chewbacca sounds) and no disc rub ("ting,ting") after hard breaks or when out of the saddle.
20200903_104358.jpg
20200903_104327.jpg
20200903_104340.jpg
The only downside is that they are not exactly lightweight at 122g/160mm and 110g/140mm. I am looking into the new Galfer rotors (viewtopic.php?f=3&t=145230&hilit=campag ... 5#p1585225) which are ridiculously light but I am not sure if I like the looks of them. That wavy edge seems more appealing to MTB application rather than on a road bike.

NordicSal
Posts: 164
Joined: Thu Feb 14, 2019 11:09 pm

by NordicSal

edchristoph wrote:
Thu Sep 03, 2020 9:55 am

20200903_104358.jpg
20200903_104327.jpg
20200903_104340.jpg

Is this an XL size Endurace or Ultimate? I really want my Endurace to look like that, need a summer wheelset and a cockpit

edchristoph
Posts: 13
Joined: Sun Aug 18, 2019 10:40 am

by edchristoph

It's an Ultimate in size XL. I am 195cm tall...

rides4beer
Posts: 406
Joined: Wed Nov 28, 2018 5:27 am
Location: SC

by rides4beer

I still like RT81s for aesthetics, clean and simple design, and I haven't had any issues with their performance (I'm 185lbs and have done over 500k ft so far this year).

Image

NordicSal
Posts: 164
Joined: Thu Feb 14, 2019 11:09 pm

by NordicSal

edchristoph wrote:
Thu Sep 03, 2020 4:21 pm
It's an Ultimate in size XL. I am 195cm tall...
Nice, looks a lot like my Endurace, same size. I am around your height, a bit taller but less than 2 metres. Endurace and Ultimate look really nice even in the XL size, that's not often imo.

Hexsense
Posts: 1459
Joined: Wed Dec 30, 2015 12:41 am

by Hexsense

eljamoquio wrote:
Wed Sep 02, 2020 8:29 pm
Karvalo wrote:
Fri Mar 08, 2019 8:53 am
And yet I've never seen a road bike with 203mm rotors :wink:
Admittedly not 203mm, but my road bike *does* have 622mm rotors.
Let me guess: a terribly hollow non-steel 622 rotor that can't withstand hydraulic pressure. And it does not run true enough to have less than 1mm gap between the pad and rotor (thus need more clearance but less leverage caliper)?

by Weenie


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