You may have seen the 5.97kg Cannondale Flash that S. Roth presented in the Eurobike (pics 1 and 2)...that bike had a pair of Crank Brothers EB 4ti that weighed 139.2gr. A very nice weight but we still can push the boundaries a bit more.
This is a pic of a disassembled CB EB 4ti already tuned (pic 3) but still a bit "heavy". Basically, we have to modify every single part (weights per pedal).
Normal weight (pic 4)
First, we work with the main wings polishing the body and shaving the combs of the ends of the body (pics 5 and 6). 3.3gr
The secundary wings have not combs but polishing them we can reduce 0.5gr
The body where the spring is placed is made of Ti and weighs 5.4gr. In light-bikes.de we can get an aluminium version(<80kg) that weighs 3.5gr/piece (pics 7 and 8 ). 1.9gr
This is the main change, the normal spring is made of steel and weighs 11.5gr. Coparni have made a carbon version with an amazing weight of 1.3gr (pics 9 and 10). 10.2gr
The only part that we haven´t changed is the axle. The normal one is made of Ti6Al4V, weighs 31.5gr with a length of 91.58mm. We can get a Ti6Q2 version in http://www.titaniumspindles.com
that measures 88mm and weighs 28.65gr (pic 11). We reduce the Q-Factor 7.16mm and 2.85gr
I haven´t found any pic of the bearings of these pedals but I use these of a Speedplay Zero that are about the same size. Changing the bearing body that is made of steel to a plastic one (pics 12 and 13) we reduce 2.5gr
Next, changing the normal bearings to a Full Ceramic version (pics 14 and 15) we reduce 1gr
The only nut of the pedal is made of steel but we can find aluminium security nuts in TorontoCycles. We reduce 1.9gr
Finally, changing the pedal cap to a plastic one we reduce 0.9gr
Total weight, (83-25.1)x2 = 115.8gr