This Stunning Race Replica Started Life as a Royal Enfield
The GRR by XTR Pepo is a retro supermono race rep’ based on the Royal Enfield Guerrilla 450
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There are few builders as singular in their vision as Spain’s Pepo Rosell, the man behind XTR Pepo. The former Radical Ducati mastermind has turned his attention to the single-cylinder format, and the GRR, a stripped-back, race-bred reinterpretation of Royal Enfield’s Guerrilla 450.
Built in Madrid by a man whose CV includes decades in endurance-inspired custom builds, the GRR is designed not to compromise but to perform. It’s an homage to lightweight race bikes with a street twist. All wrapped in bodywork that looks like it came straight out of an acid trip in a wind tunnel.
You may also like to read our Royal Enfield Guerrilla 450 review.
A Royal Enfield, But Not as You Know It
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As mentioned, the donor bike is the Guerrilla, but blink and you’ll miss the resemblance. The steel frame has been heavily modified with a custom solo-seat and subframe, new fairing mounts, and a lightweight aluminium swingarm. Every inch screams racing intent. The engine stays standard for now, but with a modified airbox fitted to help it to breathe.
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Suspension comes courtesy of 43mm Showa forks, adjustable for rebound and compression, clamped in bespoke S&P triple yokes. At the back, there’s a custom-spec Nitron R1 shock holding things together. Brakes are a mix of Italian artillery: Discacciati calipers and a radial master cylinder up front, with a rear Brembo setup gripping an NG rotor.
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The wheels are classic three-spoke DYMAG CH3As, lightweight forged aluminium jobs, though, not carbon fibre…
The bodywork is straight out of a designer's fever dream, penned in collaboration with FUTURA 2000 (Torino) and Alberto Caimi. Pepo’s original concept sketch went through 3D modelling, master printing, and moulding to become the aggressive, ultra-minimalist form you see here. The fuel tank even gets a transparent strip so you can eyeball your fuel level in real-time. The solo seat hides all the electrics, and the whole front-to-tail design feels almost monocoque in execution.
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Rounding out the build is a full custom 45mm exhaust system from XPIPE, capped with a Spark titanium-carbon silencer. Expect a bark that matches the bike’s bite—sharp, angry, and unashamedly raw.
In short: I want one!
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