Retention System: Bell's Ergo Fit system allows for easy fine-tuning of the fit by twisting the dial at the back of the helmet

Provides two storage compartments inside the front triangle

deep penetrating PTFE lubricant that excels in dry conditions

Allows you to replace your ring in less than a minute with a 4mm hex

Shimano Deore FC-M5100-1 96 BCD Asymmetric Chainring - 96 BCD - Shimano Asymmetrical - Round - Black - 30T Heavy/Bulky Retention System: Bell's Ergo FitReplacement rings for your Shimano 1x10 or 1x11 2 peice cranks using 96mm Asymmetrical 4 bolt mounting. With a combination of Shimano's tooth profile and durable materials, the Deore Series FC M5100 series rings were designed for great chain retention and longevity. Choose from either 30, 32, or 34T versions. Who's this item for: Riders with Shimano cranks utilizing the 96mm Asymmetrical 4 bolt mounting that are looking for a genuine Shimano