XTR M960 Chain Guide

thingiverse

I wanted to repurpose a Shimano XTR crank set with three chainrings as a single-ring setup by removing the biggest ring (146 BCD), but this created a significant gap for the chain to drop into. To address this, I installed a gadget that bolts into the four spider holes and prevents the chain from falling off the outside of the middle chainring. So far, so good. The large ring often gets grease all over your pants, and I've witnessed more than one nasty calf laceration on riders after a crash. As a result, I prefer to run a bash guard instead of the outer big ring whenever possible.