What Our Gearhead(R) Experts Are Saying:"I run the Twinty 2X Chainguide (ISCG, 36-40t) on my enduro bike-it's bomber. The bashguard has taken serious hits and my drivetrain hasn't skipped a beat. No noise, no fuss, just secure shifting even when things get rowdy."For riders who hammer big terrain with big chainrings, the Blackspire Twinty 2X Chainguide with ISCG mount (36-40t) is a quiet guardian against dropped chains and bashed drivetrains. Whether you're racing enduro or just riding aggressively, this guide keeps your drivetrain focused and friction-free. Mounted via ISCG tabs and designed specifically for 36 to 40-tooth chainrings, the Twinty 2X features a proprietary polymer slider that guides the chain silently with minimal resistance. The integrated bashguard absorbs impacts that would otherwise compromise your rings-so you can charge rocky descents with confidence. Optimized for SRAM 2x10 cranks but adaptable to a range of setups, this guide is lightweight, efficient, and ready to roll as hard as you do.