2d flat vs 3d shields??
i was looking at hjc antifog smoke shield replacements, and noticed that there's two kinds out there: 2d and 3d. On motorcycle superstore, 2d is more expensive, and on hjc it says...
2D / 3D Shields (What’s the Difference): 2D shields are primarily used for racing purposes as they only have a single horizontal curvature, allowing tear-off films to be stretched across the main surface without warping. The more standard 3D shield has both horizontal and vertical vertical curvatures.
what does this mean?? whats better??