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 Post subject: Light weight rotors
PostPosted: Mon Feb 27, 2017 2:54 am 
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Joined: Wed Feb 08, 2017 5:07 am
Posts: 2
What are some light weight rotors? Is there really a difference in rotors? I have been told I need ice tech rotors, but I have read that they don't make a difference. If they really aren't any better, I want the lightest rotors I can find. Any advice or recommendations would be greatly appreciated


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 Post subject: Light weight rotors
Posted: Mon Feb 27, 2017 2:54 am 


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 Post subject: Re: Light weight rotors
PostPosted: Mon Feb 27, 2017 3:26 am 
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Joined: Sun Oct 07, 2012 2:39 am
Posts: 1013
Location: Blacksburg, VA
Avoid any carbon or aluminum-ceramic stuff like the plague.

While they may be mature tech in other sports (F1, MotoGP), those concepts are poorly executed for MTBs right now.

Steel is real, in this case.

Sent from my XT1585 using Tapatalk


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 Post subject: Re: Light weight rotors
PostPosted: Mon Feb 27, 2017 4:01 am 
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Joined: Wed Apr 08, 2009 5:23 am
Posts: 591
Location: Olympic Nat'l Park, WA
KCNC Razor is a good value in a light steel rotor:
http://www.kcnc.com.tw/products.php?fun ... _parent=19

Personally I use aluminum-based rotors for road, but for mtb I like Carbon-Ti, which may be the lightest quality steel.

There are prior year threads on this very topic as well.


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 Post subject: Re: Light weight rotors
PostPosted: Mon Feb 27, 2017 1:46 pm 
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Joined: Wed Jan 18, 2012 4:23 pm
Posts: 907
Location: Midlands, United Kingdom
There are a number of options depending on usage (?).

Ice tech works very well for what its designed for (keeping heat at bay during long protracted braking) but for XC and light to moderate trail riding it's simply not needed.

KCNC or Ashima are good lightweight options, a little bit heavier but a lot cheaper there is alligator or for a small weight increase but a full braking surface there is A2Z.

I use an A2Z on the front and an alligator on the rear and it gives the combination of light weight and decent braking on harsher terrain that suites me.

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 Post subject: Re: Light weight rotors
PostPosted: Mon Feb 27, 2017 2:22 pm 
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Joined: Fri Dec 11, 2009 9:06 pm
Posts: 9
Good selection here: http://www.xcracer.com/shop/index.php?tag=12
Personally use the Quaxar ones, which are the same as Ashima.


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 Post subject: Re: Light weight rotors
PostPosted: Mon Feb 27, 2017 6:12 pm 
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Joined: Thu Jul 16, 2009 9:33 pm
Posts: 368
I'm using Ashima Ai2 66gram rotors from 2 years,and they are very good. The "Ashima look" has few brands.


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 Post subject: Re: Light weight rotors
PostPosted: Thu Mar 02, 2017 9:52 pm 
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Joined: Thu Jan 13, 2011 4:04 pm
Posts: 555
Location: Sunny UK
I found 2 drawbacks with the really light rotors, those that have more air than metal in the braking surface:
1. they do not stop as well and can cause juddering at the front
2. they wear pads quickly

The best all round rotor (good stopping ability, lightweight and price) is Hope SAW (not the latest version as these have become heavier), otherwise check out the Deckas rotor which is much cheaper, not much heavier but not quite as good for stopping as the Hope.


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 Post subject: Re: Light weight rotors
PostPosted: Sun Mar 19, 2017 3:00 pm 
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Joined: Mon Nov 16, 2015 3:09 am
Posts: 12
I've read or seen somewhere about some pro tip: use only half of the bolts when attaching the rotor. Will be trying this for first time this season so dunno how well it'll work.....


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 Post subject: Re: Light weight rotors
PostPosted: Sun Mar 19, 2017 5:37 pm 
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Joined: Thu Apr 10, 2014 11:06 pm
Posts: 88
i only use 3 bolts on my brake rotors, but it has to be said that i check them pretty regularly and i only weigh 53kg :)


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 Post subject: Re: Light weight rotors
PostPosted: Sun Mar 19, 2017 7:28 pm 
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Joined: Fri May 25, 2007 6:43 pm
Posts: 3310
If you have a pro mechanic with a pro schedule and a pro level of ability, you'll be fine.

Otherwise, i'd think long and hard about that!
Maybe try 3 steel and 3 Al or 3 Ti and 3 Al.


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 Post subject: Re: Light weight rotors
PostPosted: Mon Mar 20, 2017 3:26 am 
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Joined: Thu Feb 16, 2017 9:11 am
Posts: 7
mattr wrote:
If you have a pro mechanic with a pro schedule and a pro level of ability, you'll be fine.

Otherwise, i'd think long and hard about that!
Maybe try 3 steel and 3 Al or 3 Ti and 3 Al.



Second on the 3 Ti 3 Al bolts. It may be better to get the torque on 6 Ti bolts and after the rotor is mounted replace a Ti bolt with Aluminum one at a time, to get to the 3 Ti and 3 Al more reliably.


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 Post subject: Re: Light weight rotors
PostPosted: Wed Mar 22, 2017 10:45 am 
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Joined: Thu Jan 13, 2011 4:04 pm
Posts: 555
Location: Sunny UK
3 disc brake bolts??

Think about what could happen if the rotor parts company with the hub when you desperately need to stop to avoid the oncoming car/ditch/tree vs the weight saving.

IMO not worth the risk; you'll probably pick up more weight in mud on the tyres than the weight saved by ditching 3 bolts.


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 Post subject: Re: Light weight rotors
PostPosted: Wed Mar 22, 2017 11:54 pm 
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Joined: Tue Mar 14, 2017 11:53 am
Posts: 17
Location: United Kingdom
I ran the KCNC Razors and Quaxar from mt zoom, both very light, but as has been mentioned they just didn't have the bite. I'm now running XTR M9000 race with the 160mm ice techs and the feel is much better (though obviously a weight gain).


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 Post subject: Re: Light weight rotors
Posted: Wed Mar 22, 2017 11:54 pm 


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 Post subject: Re: Light weight rotors
PostPosted: Thu Mar 30, 2017 4:05 pm 
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Joined: Wed Dec 30, 2015 4:04 pm
Posts: 118
with shimano brakes I would run icetech setup. If you have centerlock hubs then you are limited to same type of rotors or with 6 bolt adaptors which add weight.


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