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
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
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.
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.
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.
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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Simon (AKA Toad) has been working within the motorcycle industry for more than twelve years, and a member of the motorcyclist family since birth. Growing up around British-built single and twins, it was inevitable that a life on two wheels was on the cards, from a very early age!
