Grin Torque Arm V4 Rear

Grin's V4 universal rear torque arm is a thick 1/4 inch (6.35 mm) stainless steel plate with a flippable axle plate for horizontal or vertical dropouts and multiple hose-clamp slots. It's a simple, robust legacy-design rear arm for 12 mm and 14 mm axles — superseded by the splined V5/V6/V7 series but still cataloged for straightforward rear hub installations.