Race Face Chain Guide Lightweight Diabolus chainguide brings compatibility & ease of installation to a whole new level. Designed for a wide range of frames & suspension systems, our Diabolus guide is optimized to work flawlessly with our X-Type line of cranks. Ridden by Darren Berrecloth & Kurt Sorge, two of the best free riders on the pro scene today so you know this guide is good. The newly redesigned D2 guide is proven to work for even the most aggressive DH Racers or Free riders. Boomerang is manufactured from 6061 Aluminum for durability. Aggressive profiling on boomerang is designed to accommodate flush mounted suspension designs Advanced materials used in upper & lower guides offer unsurpassed impact strength & wear resistance. Injected moulded upper guide conforms & encapsulates the chain, providing far greater support than single point contact systems. 40 degrees of articulation for compatibility with a wide range of frame & suspension designs & also accommodates chain rise in long travel bikes. Lower inside guide plate is anchored to the boomerang, ensuring no dirt or debris gets in, ensuring the system continues to run smooth Sprocket uses Standard bearings for ease of maintenance & replacement. Compatible with 68/73, 83 & 100mm BB shells Designed to protect your middle and inner chainring from impacts. Manufactured from bombproof, super thick, heat treated aluminum. CNC profiling gives a 25% weight savings over ‘cookie cutter’ bash rings. 4 bolt configuration to cover 38T to a 40T ring.