OneUp Top Chainguide with Bashguard Eliminate dropped chains Almost every EWS pro runs both a chainguide and narrow wide chainring Combines upper chain retention with lower chainring bash protection Reinforced nylon bash guard and a back plate cut from 8mm thick 7075-T6 aluminum Boost and oval chainring compatible Tool-less upper guide flip 5.5mm of chainline adjustment Single tool install without removing your cranks Includes 3 different sizes of bash plate for compatibility with chainrings from 28-36t – 90g (28-30t), 105g (32-34t), 110g (36t) Mount: ISCG-05