What's silly is that this is modeled after the LOOK ZED crank in coordination with LOOK (I believe).
LOOK knows what's up. They offer two options when you
buy a R96:
The ZED TRACK crank is available in two sizes and the length of the crank arms are adjustable thanks to a tri-lobed nut.
Size 1: 165mm / 167.5mm / 170 mm
Size 2: 172.5mm / 175mm / 177.5 mm