In praise of the obsolete: IS disc mounts

[EB]

Full disclosure, I dislike flat mount brakes. Quite a lot. I know some of you like them, and that's cool. I even have a flat-mount bike myself, but I curse at it every time I have to work on the calipers.

It always makes me happy when a frame is built with the (very obsolete) IS standard. A couple of days ago I switched from 160mm to a 180mm rear rotor on my Neuhaus Hummingbird and it was so easy - remove the caliper, swap to a rear 180 post-mount adapter with only two bolts, take up a smidge of slack from the brake hose, and bolt the caliper back in place. The caliper easily aligned and bike was good to go. It was nice to be reminded how easy this is.

Post-mount is also nice, but IS is easier for metal frame builders to implement correctly, and retains more flexibility, since post-mount can only be adapted for larger rotors than intended, not smaller ones.