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 Post subject: lightweight disc rotors
PostPosted: Tue Nov 02, 2010 10:37 am 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4446
Location: Herts UK
there seem to be a plethora of lightweight brake disc rotors that have more air then metal in the braking surface. :shock:

I know it is most unretro but is anyone using this type of rotor and how does it compare to the more solid type, like Shimano?

an example of lightweight rotor
Image

and shimano rotor for comparison.
Image


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 Post subject:
PostPosted: Tue Nov 02, 2010 11:25 am 
Posh Mark
Posh Mark
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Joined: Wed Apr 18, 2007 2:49 pm
Posts: 5982
Location: As far from the city as you can be ....
I have used these:

Image

Image

Image

and have found very little difference between them. The fancier designs do seem to "pulse" a little bit more than the more straight forward designs but thats not really a problem.

Any help?



BTW this should be in Off Topic :wink:


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 Post subject:
PostPosted: Tue Nov 02, 2010 11:41 am 
Old School Grand Master
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Joined: Fri May 01, 2009 7:11 pm
Posts: 8479
Location: Fircombe.
The 1st disc is really a bit extreme, no? I would imagine it would be pretty crap, having no real braking surface, and having no volume to act as a heat sink, fade is likely to be horrible.
Might as well use cantis...


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 Post subject:
PostPosted: Tue Nov 02, 2010 11:47 am 
Gold Trader
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Location: St.Annes
i use the hope floating rotors, they are really good


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 Post subject:
PostPosted: Tue Nov 02, 2010 12:10 pm 
Old School Grand Master
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Location: Herts UK
mountainloz wrote:
i use the hope floating rotors, they are really good


don't say thing like that ... I had opportunity to buy a pair for £ 40 .... :evil:


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 Post subject:
PostPosted: Tue Nov 02, 2010 12:13 pm 
Gold Trader
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Location: St.Annes
02gf74 wrote:
don't say thing like that ... I had opportunity to buy a pair for £ 40 .... :evil:

gutted, i'd love a pair for that price :(


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 Post subject:
PostPosted: Tue Nov 02, 2010 2:13 pm 
Gold Trader / MacRetro rider
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Joined: Thu May 06, 2010 10:05 pm
Posts: 5654
Location: Aberdeen
I've used the Ashima Air rotors recently and tbh found them no better or worse than the Avid rotors which they replaced.
If you need new rotors or want to shed a few grams then they may be worth a look.


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 Post subject:
PostPosted: Tue Nov 02, 2010 2:25 pm 
Old School Grand Master
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Joined: Mon Jun 25, 2007 8:37 am
Posts: 3146
Location: Whiskey bent & hellbound!
suburbanreuben wrote:
The 1st disc is really a bit extreme, no? I would imagine it would be pretty crap, having no real braking surface, and having no volume to act as a heat sink, fade is likely to be horrible.
Might as well use cantis...


+1

The more holes for 'heat dissapation' doesn't necessarily work...you actually need surface as it's the friction that makes brakes work!


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 Post subject:
PostPosted: Tue Nov 02, 2010 5:04 pm 
Old School Grand Master
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Joined: Tue Jul 17, 2007 5:13 pm
Posts: 8184
Location: Tredavoe, Cornwall
Why not try paper plates? You could cut out any shape you liked. They would be cheap and light, not good in the wet though!! :wink:


Personally I would rather save weight on a less critical component.

al. :D


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 Post subject:
PostPosted: Tue Nov 02, 2010 6:41 pm 
Anglian AEC / Prison Ship Captain
Anglian AEC / Prison Ship Captain
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Joined: Thu Mar 15, 2007 1:26 am
Posts: 6049
Location: LOWESTOFT the worlds smallest bore fest
been using the ashima airotors for racing on the bootleg instead of the shimano xtr great weight save over shimano and i cant feel any lack or loss of power at all but im racing xc with 160mm rotors not DHing with 200mm so cant say for them guys :wink:


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