Surly steel inner chainrings for customizing a Mr. Whirly Offset Double (MWOD) crankset. MWOD chainrings convert your Mr. Whirly crankset into an offset mountain double crank, allowing you to run extra wide rear tire and rim combinations (4.7" tires on 100mm rims, for example, or 82mm rims on your Pugsley) while avoiding chain-on-tire rubInner chainrings are unique due to a secondary bolt circle designed to bolt directly to an outer MWOD chainringThis combo bolts directly to the 58mm BCD mounting holes on Mr. Whirly cranks Item SpecificationsColorSilverMaterial304 StainlessTeeth22teethBolt Pattern5-Bolt/5-ArmChainring BCD58mmRing PositionInnerChain Compatibility9-Speed,3/32"Defined ColorSilver