Compare Quick view Black Ops Pro 27.2mm OD Pivotal Seat Post 135mm Blackops MSRP: Now: $29.99 Was: Black Ops 27.2 mm Seat Post Alloy BlackComes in black. 135mmFits any frame that requires a 27.2 mm seat posts such as a race bike or Mountain Bike. MSRP: Now: $29.99 Was: Compare Quick view