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To accurately measure piston ring radial-force, we constructed an instrument arraying 12 measuring assemblies, spaced 30º apart around the ring circumference, each comprising a roller, a slider, a load cell in a holder, and a micrometer head. Using this measuring device, we investigated the radial-force distribution in several compression rings with various ovalities. For each ring, we first measured the radial force at 30º intervals around the ring circumference, avoiding the ring gap, and then we displaced the ring 15º in the circumferential direction, and set a custom jig between the ring gap and the measuring assembly. Thus we were able to measure the radial-force at 15º intervals around the entire circumference, including the ring gap position.