Shimano XTR SM-CRM91 Single Chainring

Shimano brings top-level design to the lightweight and durable SM-CRM91 chainring. The Shimano XTR chainring features
Dynamic Chain Engagement+ for smoother pedaling and better chain retention over bumpy terrain and is offered in
30/32/34/36T gear options. Compatible with FC-M9000 / 9020 XTR cranks.

Technology

Dynamic Chain Engagement+

Shimano’s Dynamic Chain Engagement+ is a special gear teeth profile designed for use in single-chainring
configurations for XC, enduro, and trail riding.

It gives more chain retention and smoother pedaling – even over bumpy terrain. Chain retention of any gear will
reduce abrasion and worn out.

Features

• 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 Stainless steel construction supported by a carbon and alloy carrier body on 36T/34T,
  alloy carrier body on 32T/30T
• Dyna-Sys11 HG-X11 11-speed chain compatible
• Available in 30T/32T/34T/36T