Post sobre materiales (by Nino) Datos de laboratorio..

Carbonboy · 3 Nov 2004

Hola, buscando x Mtbr (q por cierto mucha fama,pero este foro le da 1000 vuelas ya q muchos post de consultas se quedan sin respuestas.. :? y aqui a cualquier consulta se le intenta ayudar.. :wink: )

Pues Nino ha tirado de scanner para poner un test de una revista alemana q tanto le gustan a Abejaruco xq da datos objetivos..

os dejo el post tal cual..
http://forums.mtbr.com/showthread.php?t=57789

i would have to scan the whole article as it was very detailed and followed up by riding each bike and commenting them.

the test wanted to know what some of those new Carbonfibre bikes were able to. not only on the lab but also out on the trails. and at the same time they showed how the other materials do when compared with the new trend material.

the conclusion right away:
only a few manufacturers can get the best out of the carbon. carbon has great possibilities to get light frames that are stiff and absorb vibrations which make them much more compliant than your typical Aluminium frame.
Scott is a prime example of succeeded design. both the HT and FS shine in this test. the Scott Scale HT has a frame weight most other manufacturers don't evenb reach on a roadbike yet it's stiffness numbers and most importantly the ride is unparalleled.

there's other manufacturers such as Merida and Storck who designed extremely stiff frames. great numbers in the lab but out on the trail testers felt beaten by any small ripple and they comment " ..you can tell if a coin is this or the other side up when riding over it...". especially Merida got criticized for having an uncompliant ride.

2 examples of different materials on the same bike/geometry:
the Storck rebel is a well known race hardtail with high stiffness numbers and regular weight (1650g). when compared to it's 2005 twin brother in carbon you see it got almost 300g lighter (1360g) yet has even higher stiffness numbers than it's oversized Al-brother., both in the headtube as well as in the BB area.

the same was done with 3 different versions of a Rocky Mountain Vertex:
RM Vertex70 (Aluminium , 1630g), RM Vertex team SC (Scandium, 1390g), RM Blizzard (Steel, 2360g)
all in the same size with the same geometry, all specd with the same parts. as you can see the difference in weight from steel to scandium it almost 1 kilo. the different numbers the lab-test shows couldn't be felt when riding these bikes out in the dirt to the same degree. just the aluminium framed Vertx felt much stiffer in the headtube and seemed to torture riders some more than the other two bikes. biggest difference was in acceleration where the lighter bikes simply felt more agile than the steel one.
final verdict here: if you don't care about weight steel is still a great material and rides nicely taking out the sharpest hits. the aluminium was already much lighter and it feels more agressive because of the harder ride. and scandium? the ride is similar to the steel frame. it has some damping characteristics and is the lightest of the three... best compromise for all those who can afford it.

the big graph shows the readings of the different tested bikes all at once.

also shown is the way the frames got tested in the lab.

and finally some numbers for different materials.
Hacer clic para expandir...

Peso Rigidez delantera rigidez trasera

ala..q los expertos no ilustren.. :wink:

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Post sobre materiales (by Nino) Datos de laboratorio..

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