Not a Bigger Tank Pad. A Different Kind of Support. The HARMONIZE EXT-RSV4 is a one-piece 3D rider support and tank grip interface for the 2021–2025 Aprilia Tuono V4. Conventional tank grips add friction to an existing flat surface. The EXT-RSV4 goes further, adding a raised, contoured support point exactly where the rider's thigh meets the tank. Its three-dimensional TPU structure gives the lower body a defined surface to brace against, while a purpose-designed anti-slip texture helps maintain consistent contact through that surface. The result isn't just more grip — it's a more functional connection between rider and motorcycle. Built Around the Rider Contact Point The Tuono's upright, naked riding position already shifts more of your body weight through your knees and core than a faired sportbike does — at a stop, in traffic, and especially under the kind of hard acceleration this platform is built for. A flat tank pad can help reduce sliding, but it doesn't change the shape of the contact area itself. The EXT-RSV4 introduces a physical contour at that point. Instead of relying entirely on friction, you can press your knee and thigh against a raised support surface — creating a more stable lower-body reference point and reducing how much you need to brace through your arms and the handlebars. Developed around the tank contact geometry of the Aprilia V4 platform, the EXT-RSV4 integrates support and grip into one compact component, without a modular mounting system or an oversized extension piece. One Structure. Two Functions. The raised profile provides physical support. The integrated anti-slip pattern helps you maintain contact with that profile. Both functions are built into one continuous TPU component — no separate grip layer, no interchangeable extension, no additional mounting base to assemble. Dry-fit the component, confirm its position, and install it as one complete unit. What Makes the EXT-RSV4 Different Raised 3D Support ProfileCreates a defined thigh contact point beyond what a flat Tuono V4 tank grip can offer. Purpose-Designed Anti-Slip TextureAn integrated grip pattern helps maintain knee and thigh contact through hard acceleration, cornering, and braking. One-Piece TPU ConstructionThe structural profile and textured contact surface are manufactured as a single continuous component, for a clean, uncomplicated installation. Aprilia V4 Platform FitmentDeveloped around the shared tank contact geometry of the 2021–2025 Aprilia Tuono V4 and RSV4. Defined Lower-Body SupportGives you a consistent surface to brace against, helping your legs contribute more to body positioning — useful at low speed in traffic as much as at pace on a back road. Compact Visual IntegrationAdds functional support without the bulk of a large tank extender or the complexity of interchangeable hardware. Pre-Applied 3M™ VHB™ AdhesiveInstalls without drilling, brackets, a separate mounting base, or special tools. Why It Matters on the Tuono V4 The Tuono's naked stance and strong acceleration place real demands on rider positioning — through hard launches, aggressive direction changes, and the everyday shifting that comes with an upright riding style. The EXT-RSV4 creates a more defined interface between your lower body and the tank — the raised contour provides physical support, and the anti-slip surface helps you maintain contact with it. Together, these give you a more usable support point than a flat grip pad alone, without changing the stripped-down, aggressive character of the bike. Specifications Spec Detail Series HARMONIZE EXT Series Model EXT-RSV4 Primary Fitment Aprilia Tuono V4 Model Years 2021–2025 Also Fits Aprilia RSV4 (2021–2025) Product Type 3D Rider Support Interface / Extension Support Kit Configuration One-piece component Material TPU Surface Purpose-designed anti-slip texture Installation Pre-applied 3M™ VHB™ adhesive tape Drilling Required No Special Tools Required No In the Box EXT-RSV4 one-piece support component with pre-applied 3M™ VHB™ adhesive ×1 Surface preparation wipe ×1 Installation Instructions Clean the installation area thoroughly. The surface must be completely dry and free of water, dust, oil, wax, and residue. If necessary, carefully warm the tank surface to approximately 25–30°C (77–86°F) using a hair dryer or heat gun on a low setting. Do not overheat the painted surface. Clean and dry your hands before handling the component or adhesive. Dry-fit the component and confirm its position before removing the adhesive liner. Gradually peel away the liner while pressing the component into position. Apply firm, even pressure across the complete mounting surface to ensure full contact. Allow the adhesive to set for at least 12 hours. Avoid riding the motorcycle or exposing the installation area to water or moisture during this period.
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