Seatpost Diameter: 27

The top of the center knobs consist of a medium durometer compound to provide traction and durability without sacrificing rolling efficiency

Weight: 38

Cage lengths: Short

SERFAS Tail Light TL-STN Clear Compatio_Enriched Seatpost Diameter: 27Features: Center 1 2 Watt Super Bright Red LED w (6) 4mm Red LEDs Versatile Rubber Mounting Straps Durable Silicone Wrapped Body Versatile Mounting Water Resistant Specs: Modes: Steady (20 Lumens): 33. 5 hrs Flashing (20 Lumens): 36. 3 hrs Strobe (20 Lumens): 35. 4 hrs Alternating Flash (20 Lumens): 58. 4 hrs Weight: 36 Grams w Bracket Runtime: Up To 100 hrs Battery: (2) CR2032