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FITS WHERE STANDARD RACKS CAN’T: Mounts your rear rack even if your bike has no seat stay braze-ons. This bike seat post clamp attaches securely to 25 - 38 mm (1" - 1.5") seat posts - round, oval, or irregular shapes included. CARRIES HEAVY LOADS WITH CONFIDENCE: Engineered as a reinforced seatpost clamp to carry up to 25 kg (55 lb). Ideal for commuting, touring, or everyday use - no wobble, no shifting, even when fully loaded. QUICK TO INSTALL, BUILT TO STAY PUT: The universal strap mount installs in minutes and stays tight with anti-slip pads. This seat clamp adapter protects your frame and resists movement - even on rough terrain. FITS MOST REAR RACKS AND GEAR SYSTEMS: Compatible with Ibera PakRak and most standard racks. This bike seat mount adapter provides bolt holes for rack arms - perfect for retrofits, upgrades, or custom setups. ADDS CLEARANCE AND RIDE COMFORT: Extends rack arms by 55 mm (2.17") for more heel space and better pannier fit. This bike post clamp improves riding comfort and prevents heel strikes on larger frames.