The teeth of the premium SM-CRM91 single chainrings are equipped with Shimano's new Dynamic Chain Engagement (DCE) technology and provide optimum chain guidance - both in terms of guidance during crank rotation and chain retention on the chainring in rough terrain. The danger of a chain jumping down is thus further minimised. In addition, these chainrings are designed with glass fibre composite material that takes into account the forces and loads that occur in each case and guarantees a long service life.
The new XTR M9000 series presents the most advanced XTR mountain bike components and wheels ever. The all-new XTR, available in the "Rider-Tuned" Race and Trail product families, benefits from Shimano's decades of leadership in designing the most powerful component groupsets in mountain biking. The XTR is geared towards the versatile capabilities and riding styles of today's riders and offers mature, proven solutions for a wide range of applications.
Material 30/32Z.: stainless steel/aluminium
Material 34/36Z.: stainless steel/aluminium/carbon fibre reinforced plastic