TOPPOST BSP-15 Generic seatposts Category: Seatposts Tag: BBB Cycling Description Description Low profile seatpost. 6061 T6 aluminum. Dual bolt adjustable clamp. Diameters: 27.2, 30.9, and 31.6 mm. Offset: 15 mm. Length: 400 mm. Weight: 315 gram (31,6 mm). Related products CABLEFIX BBL-92 Locks – Brackets ROADPROTECTOR BFD-21F & BFD-21R Fenders – Road COLDSHIELD BWG-22 Gloves – Winter WATERFLEX BWS-03 Shoecovers – Winter