Shimano Nexus EX Service Instructions Guide Bicycle MTB Hub Brake Pedal. The Lot of 4 Service Instructions include: 600EX Pedal, SG-4R31 HUB, Nexus Brake System, and SB-4S30 Shift Lever. Each item is in good shape with just some minor signs of usage and handling. They all come folded up. One side is in English and the other side appears to be in Dutch. Please see photographs for best description of cosmetic condition and style.