PRO Tharsis 375 Mountain Bike Seatpost. Show your mountain bike some upgrade love with the Pro Tharsis 375 mountain bike seatpost. This trail-ready seatpost is built from super durable forged aluminum alloy, and features a clamp head with wide angle adjustment so you can dial in your position. Trail-specific design uses an extra strong clamping head design with 10mm off set.
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