I bought some 160mm KCNC Razor rotors for a build I'm working on (see this thread for details), but I'm starting to worry over whether using lightweight rotors is a good idea.
Where I live it's possible to descend for many miles with no flat or uphill sections to cool the brakes. One local ride involves about 6 miles of descent, with an average grade of 9% and some sections over 20%. There are longer ones around. I'm starting to think maybe I should be going with beefier rotors, like Icetechs.
I'm 155 lbs. Add 3L of water in a hydropack for long summer rides, tools, spare stuff, and that's maybe 9-ish pounds more. I ain't young, and falling at speed in your late 50's is a different thing than when you're younger. Slower and harder to recover, and you may never get back to 100%.
Does anybody have experience with the KCNC Razor rotors on long (say, 4+ mile) descents? Obviously you don't want to ride them constantly, but sometimes due to steepness you have to be on the brakes quite a bit of the time. Should I buy some Icetechs instead? Or maybe an Icetech front, KCNC rear? Or upgrade to a 180mm front? I ride down similar inclines on a road bike, but it's got rim brakes, so I don't have a feel for disks. Dunno if I should even worry.
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Thread: brake rotors