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PostPosted: Wed Aug 24, 2011 11:49 pm 
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Joined: Mon Mar 30, 2009 7:41 am
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Location: Christchurch, New Zealand
Raging_Bulls wrote:
I lost some teeth when a V-brake mounting point snapped off my fork several years ago (which is why I always use brake boosters ever since). Guess that makes cantis and V-brakes dangerous as well.

Face it, the only safe method is the old-school one. With the wooden block that's being pressed onto the tire, like they did a century ago.


Na kickback pedal brake!
Building up a bike at the moment that's going to use one of these and a drum brak on the front :D


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PostPosted: Thu Aug 25, 2011 7:24 am 
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Location: Platsa, Messinias, Greece
jimo746 wrote:
I've used Ashima discs for ages (just recently sold an unused disc rotor :shock:) and this is the 1st I've heard of it :? Yes they are supposed to be weight weenie discs and if I was doing any kind of hardcore riding then I'd use something more substantial but....


In the Singletrack thread (I haven't re-read it but I did follow it when it was first posted) didn't the matter of mounting direction come up? In other words, whether the spokes were set up to be trailing or leading and the fact that the manufacturer had changed their recommendation as to which was the prefered orientation ?
Or something like that - I'll have to have another skeet.

*Edit* - I've had another read and this does seem to be the case.


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PostPosted: Thu Aug 25, 2011 9:55 am 
Old School Grand Master
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Location: Herts UK
yes - the manufacturer change the direction of the arrow.

anyways, been thinking a bit about this.

bolts when done up correctly clamp the two pieces together and the friction between them is what holds the parts together, especially in side shear situation like here.

So if the bolt was tight, the stress would be above the bolt hole, as per red dotted line in top diagram.

If the bolt was lose, then force is "pivoting" around the bolt and will along the red line, which happens to be the thinnest part of the rotor.

It'd be interesting to see photos of the other failed rotors.


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PostPosted: Thu Aug 25, 2011 10:04 am 
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Quote:
it is unlikely for one of those to jam the front wheel


I've seen canti pads dive under the rim, that tends to bring things to an abrupt halt ;)


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PostPosted: Thu Aug 25, 2011 10:09 am 
Gold Trader
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Joined: Sun Mar 21, 2010 9:04 pm
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Location: Chorley, Lancs
Does no-one just put their feet down anymore?


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PostPosted: Thu Aug 25, 2011 10:28 am 
.o.T.M Triple Crown Winner
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Joined: Sun Dec 31, 2006 12:59 pm
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Location: Sunny South of France
cantilevers are betters than disc and V brakes for really one reason :
They are cooler !

:D


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PostPosted: Thu Aug 25, 2011 11:06 am 
MacRetro rider
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Location: DUNDEE
I've recently switched to lightweight rotors should I be worried? :)

From this...
Image

to this...
Image


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PostPosted: Thu Aug 25, 2011 6:16 pm 
Gold Trader / rb Rider / Special
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Think theyre mounted the wrong way


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PostPosted: Thu Aug 25, 2011 6:41 pm 
Dirt Disciple
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Joined: Sun Mar 13, 2011 11:14 am
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Location: Northumberland in the dark
having had 5 bikes with discs on ive decided i hate them and would rather have canti or v-brakes :lol: as i think they give more feeling and so much easier to maintain 8)


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PostPosted: Thu Aug 25, 2011 6:57 pm 
Gold Trader
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Joined: Wed Jun 20, 2007 11:19 pm
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Location: Odense, Denmark
Should be common sense - it should be blatantly obvious that there's no way those rotors can deal with hardcore stuff.


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