Originally Posted by Matador
17Z caliper without fluid, pistons, or hardware ~ 8.54 Pounds
18Z caliper without fluid, pistons, or hardware ~ 8.8 pounds
It's late, and I forgot how to reset my scale to OZ/LBS
The differences between calipers are very few and differ primarily in the shape of the mount. This makes perfect sense. They fit on the same hub, and the 18Z extends farther by 10mm or just under a half an inch. This was mentioned earlier in the thread, but I couldn't find any pics, so, here:
The pins are where the brake pads "rest" on the inside of the caliper. Notice how much farther away from the mounting point this is on the 18Z (top).