I didn't understand what I didn't understand about disc brakes at the time of a wheel upgrade for my commuter. When I realized what centerlock rotors were relative to six-bolt, I knew I needed to make another purchase, so I went with these based on BTD suggestion. I initially had a moment of distress after I mounted these on the wheels and placed the wheels in the drop outs and gave them a spin . . . they didn't spin. The brake caliper housing was bumping against the rotor mount (2 out of 5). I couldn't understand what was going on. Then I took a deep breath, asked a question on G bicycle maintenance community and got an answer within minutes. Simple adjustment of washers to create a wee bit of space for the rotor to turn freely. About 500 miles later, I'm writing this review to say that these disc rotors are just right.
I was excited to mount these rotors, until I noticed the spider and rivets are too long and interfere with the brake pad levers on BB-7 road brakes. I tried respacing the calipers with some washers, but not enough of the rotor brake surface was exposed. I bought some cheaper CenterLock rotors that don't have the same length spiders, and they work fine with Avid BB-7 road calipers. Too bad - these are really well made, and I'll sell them on Ebay second-hand as they are used and cannot be returned.
I love these discs. I replaced the Stock Tektros on my Trek FXS6. I put Shimano resin pads on too. I'll be further upgrading to Shimano XT calipers and levers. It'll be a sweet set up! .
As is true for other XT components, this rotor defines the intersection of superior performance at a reasonable cost. Excellent stopping power in all conditions. The only caveat is that one must be careful when truing these rotors - they can be irrevocably damaged if bent too far.
For daily use and for high-mileage randonneuring, these rotors deliver confident stopping power on demand. Paired with semi-metallic pads for all-weather predictability. Would replace with same when worn out.
I replaced my stock TRP rotors with these, and despite the (slight) weight penalty, they stay true and have incredible stopping power. I'm sticking with Ice Tech and not looking back.