Surly aluminum outer 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 in. tires on 100mm rims, for example, or 82mm rims on your Pugsley) while avoiding chain-on-tire rub
Outer chainrings bolt directly to MWOD inner rings with 4 chainring bolts
Inner BCD (for mounting to granny ring) is proprietary; outer BCD (for bashguard) is 104mm