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Discussion Starter · #1 ·
Hi,
here is a test I just got that I found really well done. The test are done on the Cannondale Machine (made by efbe if I remember correctly).

First graph represents stiffness :



Second graph represents weight :



Last one stiffness to weight ratio :



Like I did for the brake pads test, here is also the full article in french for those who wants to see it (PDF format) :

https://pyf-wheels.chez.tiscali.fr/tests_presse/vtt-mag_crankset_1.pdf
https://pyf-wheels.chez.tiscali.fr/tests_presse/vtt-mag_crankset_2.pdf
https://pyf-wheels.chez.tiscali.fr/tests_presse/vtt-mag_crankset_3.pdf
https://pyf-wheels.chez.tiscali.fr/tests_presse/vtt-mag_crankset_4.pdf
https://pyf-wheels.chez.tiscali.fr/tests_presse/vtt-mag_crankset_5.pdf
https://pyf-wheels.chez.tiscali.fr/tests_presse/vtt-mag_crankset_6.pdf
https://pyf-wheels.chez.tiscali.fr/tests_presse/vtt-mag_crankset_7.pdf
https://pyf-wheels.chez.tiscali.fr/tests_presse/vtt-mag_crankset_8.pdf

Best regards
Pyf
 

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completely different results...

xc-rider said:
Hi,
here is a test I just got that I found really well done. The test are done on the Cannondale Machine (made by efbe if I remember correctly).
interesting to see the completely different results than the german test below:
 

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yes very interesting.......

as i have said before if 20 different labs do a test, there will be 20 different results.
i found it hard to believe the xt would be stiffer than xtr, but i had no other sources saying otherwise until now.
 

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"french test"- method...

jonny_mac said:
as i have said before if 20 different labs do a test, there will be 20 different results.
i found it hard to believe the xt would be stiffer than xtr, but i had no other sources saying otherwise until now.
well - i just read abouit how they measured the stiffness and am a bit surprised they measured it in one direction only.
they have the chain torqued with 150 Newton and measure the deformation on the left crankarm HORIZONTALY only. in a ideal world the forces will be in this direction only but we all know the forces on a crankset don't are in line...what they test here is simply the rigidity of the AXLE, not the crankarms. maybe i'm wrong but if my french is good enough that's what i understand.

they have a bike fixed on a bench.
the crankset installed and the chain on the chainring,
150 watts of torque on the right crankarm and measuring the deflection of the left crankarm.
 
G

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i am a little

suspect of the whole test anyways since c'dale was involved and they are linked with fsa,
and fsa scores top notch. need a test facility with no other outside interests.
 
G

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hmmmmmmmm...

what component co. is on the new road team that was saeco, what rings and components
come on 05 c'dales mtb's and road bikes? so the machine is c'dales, fsa is coming spec'd
on c'dales, not to hard to follow the trail there.
 

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jonny_mac said:
what component co. is on the new road team that was saeco, what rings and components
come on 05 c'dales mtb's and road bikes? so the machine is c'dales, fsa is coming spec'd
on c'dales, not to hard to follow the trail there.
ok, didn't know about that... Still doubt that kind of suplier connection would be throwing the test.
 
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if fsa

bhsavery said:
ok, didn't know about that... Still doubt that kind of suplier connection would be throwing the test.
was the only co. represented there (engineer helping with the setup) of course the fsa will
come out testing better. motorcycle shootouts are biased that way all the time.
 

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Discussion Starter · #12 ·
guys, you read too much fictions...

Sure Cannondale works with FSA, but Cannondale works with Shimano too for a lot of parts...
If you have a closer look at both german and french test, you might see that the FSA V-drive is a lot better in the german test than in the french test. Also don't you think the journalist are here when the tests are done ??? so do you really think they would let the Cannondale mechanic using less weight to push on the cranks when it's a FSA that is tested ???

We sure need to keep an eye on how serious these tests are, either they come from german, french or other countries magazines, but we don't want to become paranoid !!! In this case, I think the FSA thing is a little bit off subject. If it was true, why the vdrive would have got a "middle-range" result ???
 

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I see that...

...this entire thread is sponsored by FSA...so I would be very wary of anything you read here, because it is probably ALL (shhhh) an FSA conspiracy (who knows, it might be so top-secret even Cannondale is not invloved in this one). ;) ;) ;)

Buy Products Mentioned in This Post FSA.
 

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As a side-note I would liks to thank everyone for discussing the scientific test method as opposed to the usual 1st person account opinion of "I think x is stiffer/stronger/lighter".

I have learned tons from this info and appreciate it.

Perhaps for clarity we should look at the test method for both articles that yield different results.

Mentioned above, the French article measured only delfection in on direction. How does the German article measure? (sorry, no German fluency here)

After looking a both methods of measuring, one can look at ones riding habits and judge what is data best represents important information for them.

Mr. P
 

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if i remember correctly, this is an old test.

It was done on a cannondale frame but no sponsort from cannondale

The deflexion is mesured in the right direction, as it the direction where it create the torque that pulls on the chain.
I would have liked to see a test on left side crank too.

I think this test is old, may be one or two years
 

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Discussion Starter · #16 ·
20.100, I have the old test too, but this one comes from the last issue of VTT Mag (march 2005) and only integrated cranksets are tested. I will scan the older one also if some of you want to see it.
 

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Can't be that old anyway...

xc-rider said:
20.100, I have the old test too, but this one comes from the last issue of VTT Mag (march 2005) and only integrated cranksets are tested. I will scan the older one also if some of you want to see it.
That, and they tested Hone and FSA K-Force integrated, which didn't exist in any form until this year.
 
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