Customer Service (503) 832-7336
The Only Place For People Who Ride



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Free standard shipping on orders over $149
We ship to the lower 48 United States. Orders over $149 ship free; a flat rate applies under $149. Estimated delivery dates are shown at checkout based on item availability and the shipping option you choose.
We text or call to confirm sizing & fitment before we ship.
Every Factory SuperBike order includes a free expert check from real riders. Before we ship helmets and gear, we text or call to confirm your size and fit; for parts, we verify fitment to your bike. This is why we don't have to guess and you don't have to gamble.
Helmet & gear orders: reply to our text to confirm and your order ships, typically same day. No reply within 48 hours and we'll call you. Questions now? Call or text (503) 832-7336.
Take your MV Agusta F3 800 (2013-2025) to the next level with our Stringer Variable Velocity Stacks. Designed for riders who demand excellence, these stacks deliver significant power gains and superior acceleration, transforming your F3 800 into a true performance machine.
Factory SuperBike and Stringer Race Station have collaborated to bring you these Stringer Variable Velocity Stacks, a groundbreaking enhancement in sport bike performance. With consistent power gains across the entire RPM range, these stacks outperform traditional static stacks.
Key Features:
Top racers have reported remarkable improvements with these stacks, making them a crucial upgrade for any serious rider. No other modification at this price point offers such significant gains in power and throttle response.
Custom 3D Printed Item Policy:
Equip your MV Agusta F3 800 (2013-2025) with our Stringer Variable Velocity Stacks and experience riding like never before. It’s not just an upgrade—it’s a statement of dominance.
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