It has been nearly a year since I changed the disc brake rotors on the Specialized Aethos, but have not managed to write about it. The pace of my blogging is lagging way way behind when the modifications actually took place.
Nevertheless, I strive to continue writing about all the changes to my bikes, for archive and comparison purposes.
These are the newer RT-CL900 Dura-Ace rotors, which have a different appearance from the MT900 XTR rotors. They are cross compatible, but the CL900 rotors are supposedly more warpage resistant. For me, I usually choose rotors based on how they look and weigh, not really about performance.
Dura-Ace grade rotors CL900, in 160 and 140 mm diameters.
These rotors look more refined, compared to the aggressive and edgy appearance of the XTR rotors.
Size difference of the 140 and 160 mm rotors.
Black painted fins to help dissipate heat a bit faster.
The aluminium spider arms have been carefully designed to minimize any warpage due to heat.
I prefer this rotor design for road bikes, as the asymmetric arms look better.
Another picture of the brand new rotors, before they get used.
CL900 rotor in 160 mm diameter weighs 112 grams, 6 more than MT900 rotor.
CL900 rotor in 140 mm diameter weighs 95 grams, about 8 more than MT900 rotor.
The rotor weights shown above are without the aluminium lock ring. The lock ring will add 7 grams to the weight. I will be comparing the CL900 and MT900 rotors in a separate post, to discuss the appearance, weight, and other differences.
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