Let's talk rotors

Discuss light weight issues concerning road bikes & parts.
bruno2000
Posts: 912
Joined: Fri Jun 17, 2005 4:11 pm

Re: Let's talk rotors

Post by bruno2000 »

I'm also doubting in buying the new Dura-ace or the new XTR Rotors.
As for esthetics I like the XTR more.
But on a technical level would the Dura-Ace rotor not been made to dissipate heat better?
I can imagine heat being a biggen problem on a road bike than on a mtb bike.

Nefarious86
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Re: Let's talk rotors

Post by Nefarious86 »

If you can cook a 160/140mm XTR rotor combo on the road then the DA rotor won't be what saves you...

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TheRich
Posts: 609
Joined: Tue Jan 01, 2019 1:36 am

Re: Let's talk rotors

Post by TheRich »

bruno2000 wrote:
Fri Apr 05, 2019 11:05 am
I'm also doubting in buying the new Dura-ace or the new XTR Rotors.
As for esthetics I like the XTR more.
But on a technical level would the Dura-Ace rotor not been made to dissipate heat better?
I can imagine heat being a biggen problem on a road bike than on a mtb bike.
I have no doubt that the newest rotors are better, but it's probably less of a difference than between standard non-finned ice tech rotors and the old XTR RT99 rotors.

Mountain bikes that need big rotors generate more heat because the slopes are steeper and the turns are closer together. The road equivalent would be racing down Lombard St in San Francisco. Plus it seems like road levers give more leverage than MTB levers. Maybe it's the same piston and a longer lever, but road brakes are more powerful than they look when compared to MTB brakes.

scale29
Posts: 137
Joined: Sat Jun 04, 2011 5:40 pm

Re: Let's talk rotors

Post by scale29 »

Noctiluxx wrote:
Thu Apr 04, 2019 8:13 pm
Has anyone used the Hope Floating disk rotors on their Ultegra brakes?
Yes, they won’t work without a bit of tinkering, the rivets contact with the calliper.

bilwit
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Location: Seattle, WA

Re: Let's talk rotors

Post by bilwit »

Yeti wrote:
Thu Apr 04, 2019 6:03 pm
So what is the general consensus on "the best" rotor to use with Shimano hydraulics? The Dura Ace RT900 or the XTR MT900? Also, at 155 lbs do I really need a 160mm rotor on the front. I know how to brake and don't drag my brakes on extended downhills. Overkill with 160mm?
I used the RT900s when they came out and just recently swapped them for the new MT900s on my road bike and I don't see any reason to use the RT900s.. they look terrible and they're heavier. I'm 135lbs and use 160mm/140mm just because it seems standard. Also feels like the 160 on the front evens out the break feel to me.

spdntrxi
Posts: 3459
Joined: Sat Jul 20, 2013 6:11 pm

Re: Let's talk rotors

Post by spdntrxi »

bilwit wrote:
Fri Apr 05, 2019 6:28 pm
Yeti wrote:
Thu Apr 04, 2019 6:03 pm
So what is the general consensus on "the best" rotor to use with Shimano hydraulics? The Dura Ace RT900 or the XTR MT900? Also, at 155 lbs do I really need a 160mm rotor on the front. I know how to brake and don't drag my brakes on extended downhills. Overkill with 160mm?
I used the RT900s when they came out and just recently swapped them for the new MT900s on my road bike and I don't see any reason to use the RT900s.. they look terrible and they're heavier. I'm 135lbs and use 160mm/140mm just because it seems standard. Also feels like the 160 on the front evens out the break feel to me.
MT900 in 140 are not really good looking to me either ( 4arm)... are the 160mm's 5 arm atleast ?) most pics I see are the 5 arm 180's which look great.

bilwit
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Location: Seattle, WA

Re: Let's talk rotors

Post by bilwit »

spdntrxi wrote:
Fri Apr 05, 2019 6:53 pm
bilwit wrote:
Fri Apr 05, 2019 6:28 pm
Yeti wrote:
Thu Apr 04, 2019 6:03 pm
So what is the general consensus on "the best" rotor to use with Shimano hydraulics? The Dura Ace RT900 or the XTR MT900? Also, at 155 lbs do I really need a 160mm rotor on the front. I know how to brake and don't drag my brakes on extended downhills. Overkill with 160mm?
I used the RT900s when they came out and just recently swapped them for the new MT900s on my road bike and I don't see any reason to use the RT900s.. they look terrible and they're heavier. I'm 135lbs and use 160mm/140mm just because it seems standard. Also feels like the 160 on the front evens out the break feel to me.
MT900 in 140 are not really good looking to me either ( 4arm)... are the 160mm's 5 arm atleast ?) most pics I see are the 5 arm 180's which look great.
160s are 4-arm too. I had reservations about those 90 degree arms but it's a better look to my eye than the obnoxious ice fins on the road model

spdntrxi
Posts: 3459
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Re: Let's talk rotors

Post by spdntrxi »

Thanks for confirming... that was my concern. Slight bummer

ichobi
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Joined: Thu Jan 19, 2012 11:30 pm

Re: Let's talk rotors

Post by ichobi »

Anyone got experience with the Carbon-Ti rotor? They seems to be half the weight of SRAM Centerline XR rotor.

http://www.carbon-ti.com/products/brake ... rbon-2-160

160mm rotor at only 77g. Quite costly though.

ChiZ01
Posts: 344
Joined: Wed Jan 01, 2014 6:20 pm

Re: Let's talk rotors

Post by ChiZ01 »

ichobi wrote:
Mon Apr 08, 2019 5:05 pm
Anyone got experience with the Carbon-Ti rotor? They seems to be half the weight of SRAM Centerline XR rotor.

http://www.carbon-ti.com/products/brake ... rbon-2-160

160mm rotor at only 77g. Quite costly though.
77g + 30g centerlock adapter is not really light

bruno2000
Posts: 912
Joined: Fri Jun 17, 2005 4:11 pm

Re: Let's talk rotors

Post by bruno2000 »

On Cyclingtips I saw a pictyure of Sagan riding 160mm front xtr rotor and 140mm rear xtr rotor.

ryanw
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Location: London

Re: Let's talk rotors

Post by ryanw »

I think they look better than the DA 9100 rotors, and they weigh 22g less combined (160/140mm):

Image

Image
'16 Cervelo S5 - 6,650g RIP
'17 Focus Mares Force 1 - 7,170g
'19 Cervelo S5 Disc - 7,460g

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willmac
Posts: 164
Joined: Thu Aug 25, 2016 11:33 am

Re: Let's talk rotors

Post by willmac »

Do you have a photo of the rear rotor?

ryanw
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Location: London

Re: Let's talk rotors

Post by ryanw »

It's identical but smaller.
'16 Cervelo S5 - 6,650g RIP
'17 Focus Mares Force 1 - 7,170g
'19 Cervelo S5 Disc - 7,460g

IG: RhinosWorkshop - Check it out for all my custom builds :thumbup:

:!: Ride Southern Spain Cycling Holidays *£445 for 7 Nights* :!:

willmac
Posts: 164
Joined: Thu Aug 25, 2016 11:33 am

Re: Let's talk rotors

Post by willmac »

ryanw wrote:
Wed Apr 10, 2019 4:56 pm
It's identical but smaller.
I assumed that. I was wondering about the aesthetics and the ratio of actual rotor vs spider compared to the larger 160.

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