Shimano Deore XT SM-CRM85 Single chainring for XT M8100 / M8130, 36T Dynamic Chain Engagement (DCE) is used to hold the chain and help prevent chain jump out. This is achieved by using a broader and taller tooth profile in conjunction with a special hooked leading edge and alternate profiled tooth shaping. This provides superior chain retention, lower driving sound, increased durability and drag to a minimum. Hollow gear construction for optimized rigidity, lightweight and durability. Durable teeth using a plated steel construction supported by a carbon composite (CFRP) carrier body. HG 12-speed chain compatible. Available in 28T/30T/32T/34T/36T. Shimano's Deore XT SM-CRM85 stiff and lightweight chainring delivers smooth pedalling over bumpy terrain. The SM-CRM85 chainring features Shimano Dynamic Chain Engagement+ technology, which features special gear teeth profiles that deliver exceptional chain engagement and chain retention. Special MTB gear teeth profile improves chain engagement and retention. Exchangeable single/double chainring. Crankset can be used as common component.