himano Deore XT SM-CRM85 Single chainring for XT M8100 / M8130 - BLACK12 speed 32T these retail at £79looks in great conditonShimano's Deore XT SM-CRM85 stiff and lightweight chainring delivers smooth pedaling 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