MRP designed its Podium Chainrings to work with chainguides or as singlepeed rings with no ramps or shift pins. Product FeaturesMaterial: 7050 aluminumNumber of Rings: Bolt Circle Diameter: (4 bolt) 104 mmBashguard Included: Connection: Compatible Components: Weight: Recommended Use: replacin" a ring or that fresh new buildManufacturer Warranty: 1 yearTeeth: 32, 33, 34, 35, 36, 37, 38, 39, 40 T