I don't want to sound conspiracy minded here, but some of you may have seen that this exact scenario played out with the Shimano ICE tech rotors on the XTR test in one of the German MTB magazines (from the same publisher as Tour) a few years ago.
It caused a similar hubbub, as generally the German magazines seem to bring a nice degree of objectivity to testing of parts, actually measuring stiffness of frames and wheels, stripping frames to confirm weights, measuring crr of tires, etc...[\quote]
Well It's no news that some German publications or orgnizations have forge results in past.
Most recent one was the ADAC scandal.
C: Ergott mentioned above that Alu melts at 660C whereas the MTB test protocol seems to stipulate that they cut the test off at 400C. If those figures are correct, the discrepancy should be obvious.
If their lab testing exceeded any conditions reached in the real world, I could understand the possibility of a failure in the lab, but none in the real world. But in both the MTB and Road cases here, they seem to have achieved failure in the real world too.
Metal getting soft as temp rises. So maybe it did't melt down at all.It just creep under test load at 400C degree. However, as a large weight rider(90kg), XTR brakes never have a single failure during my ride in years.In competition scenario or very deep descend they all works fine. I don't even have to bother to think if I should control the temp of the rotor.I Actually scalded my finger tip when check rotor temp after 1 minute stop riding once.
One more thing for the conspiracy theory...
As a mechanical design engineer works in automation industry. I work both with many German and Japanese car parts suppliers. When I make suggestions to German production engineers and industrial engineers that they may use more simple method to build the machines just as their Japanese tiers.Most of them smiles in stance of deliberate contempt. I guess there's a strong pride behind.
But the truth is，Japanese produce beter quality goods at lower cost. In addition, For the very same product design.
A little off topic though.
And absoluty no offense to any German folks on the forum. That's just what I have observed and expierenced in years.