Surly's OD cranks now have a more durable outer chainring option. Designed to handle snowy wet conditions that a fat bike using Surly''s OD crank might see the new OD Chainrings are made from stainless steel. The material change from alloy to stainless wasn''t the only update, Surly also revised the profile of the ramps, gates, and shift pins for better, more consistent shifting.
Surly has an OD Chainring replacement guide available online here.
For Surly OD cranks
Updated ramps, gates, and shift pins
Direct replacement for older alloy OD chainrings
Shimano/SRAM 10, Shimano/SRAM 9
Fat Bike, Mountain
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