Perhaps most importantly

and aesthetic appeal

smoother lever action

Engineered with ProTection puncture resistance and a multi-layer carcass

making them a worthwhile investment for serious cyclists

shimano chainring 53t dura ace r9100 Product Type_Rain Jacket Perhaps most importantlyThe Shimano Dura Ace FC R9200 chainring uses hollow forged technology to provide a significant weight loss while giving increased rigidity. This guarantees the optimum power transfer. SHIMANO 2 12 speed chainring for Dura Ace FC R9200 crankset and Dura Ace FC R9200 P cranks with powermeter. While the inner chainring is made of anodised aluminium, the outer chainring has been hollow formed (Hollowglide) from anodised aluminium and carbon fibre