The e*thirteen Vario Downhill chainguides are ready for the toughest riding. Most appropriate for all downhill or freeride riding on bikes with 140mm travel and up Versatility in mounting: The armature can be fixed either inside or outside of the guide backplate to better suit various bike setups Choice in coverage: Includes a selection of bashguards for 28-32 or 34-36 tooth chainring sizes Optional lower idler: For those who prefer, the downhill guides can be used with or without the super quiet, low-friction stealth lower idler for maximum chain retention Compatible with Boost and SuperBoost Chainlines Premium aluminum backplate 28-36t chainring capacity ISCG05 2-Bolt mount