2021 KTM 450 SMR Review: The Ultimate Supermoto Weapon

Introduction

The 2021 KTM 450 SMR isn’t just a motorcycle—it’s a statement. Born from the championship-winning DNA of the KTM 450 SX-F motocross platform and refined for asphalt domination, this machine epitomizes the "Ready to Race" ethos. Designed for closed-course competition but dripping with enough charisma to make even casual riders weak in the knees, the 450 SMR blurs the line between a factory race bike and a production model. After spending hours threading it through tight corners and testing its limits on mixed surfaces, one thing becomes clear: this is a precision instrument for those who live for the thrill of apex hunting.

Riding Experience: Where Precision Meets Pandemonium

Engine Performance

At the heart of the 450 SMR lies a 449.9 cc liquid-cooled single-cylinder engine that’s as explosive as a stick of dynamite. With a bore and stroke of 95 mm x 63.4 mm (3.7 x 2.5 inches) and a 12.75:1 compression ratio, this SOHC powerplant delivers a hit of torque that feels like it could yank your shoulders out of their sockets. The Keihin EFI system with a 44 mm throttle body ensures crisp throttle response, while the 5-speed PANKL gearbox (14/45 final gearing) lets you exploit every last rpm.

But here’s the magic: despite its motocross roots, the 450 SMR’s power delivery is surprisingly tractable. The Suter slipper clutch and Brembo hydraulics tame rear-wheel hop during aggressive downshifts, while the Keihin EMS offers selectable engine maps. Want to dial back the aggression for wet conditions? The traction control system (a rarity in this segment) lets you do exactly that.

Chassis & Handling

With a dry weight of 102 kg (224.8 lbs) and a wheelbase of 1,468 mm (57.8 inches), the 450 SMR feels like a scalpel in motion. The chromium molybdenum steel frame and aluminum subframe strike a perfect balance between rigidity and flex, inspiring confidence whether you’re knee-dragging on pavement or sliding through a dirt section.

The WP XACT USD 48 mm forks (285 mm travel / 11.2 inches) and linkage-assisted WP XACT shock (266 mm travel / 10.5 inches) are tuned for Supermoto-specific abuse. They absorb curbs and off-road imperfections without sacrificing the tautness needed for razor-sharp cornering. The 26.1° rake and 16 mm triple clamp offset contribute to a steering geometry that’s quicker than a caffeine-fueled squirrel.

Braking & Wheels

Brembo’s 4-piston radial caliper biting a 310 mm front disc delivers stoppies on command, while the 220 mm rear disc offers modulated control for slides. Paired with Alpina’s tubeless 16.5” front and 17” rear spoked wheels wrapped in Bridgestone Battlax Racing slicks, the 450 SMR carves corners with the tenacity of a bloodhound on a scent trail.

Design & Build Quality: Form Follows Function

KTM’s obsession with weight savings is evident everywhere. The aluminum exhaust system, forged triple clamps, and minimalist bodywork shave grams without compromising durability. The 890 mm (35-inch) seat height might intimidate shorter riders, but the narrow profile lets you grip the tank effortlessly.

The cockpit is all business: a Neken handlebar with ODI grips, no-frills digital display, and controls that feel like they’re milled from billet aluminum. Even the 7-liter (1.85-gallon) fuel tank is shaped to optimize knee grip during hard cornering.

Competition: How the 450 SMR Stacks Up

Husqvarna FS 450

The FS 450 shares the same engine platform but differentiates itself with a composite carbon fiber subframe and WP XPLOR suspension. While slightly lighter, it lacks the KTM’s traction control and feels more "motocross-oriented" on asphalt.

Honda CRF450R Supermoto

Honda’s converted motocrosser is 8 kg (17.6 lbs) heavier and relies on Showa suspension. The CRF’s broader powerband appeals to less experienced riders, but its 5-speed transmission can’t match the KTM’s gear-driven aggression.

Yamaha YZ450F SM

Yamaha’s offering shines with its reverse-head engine design, which centralizes mass. However, the absence of a slipper clutch and tubeless wheels makes it feel less refined during aggressive track sessions.

Verdict: The 450 SMR dominates with its electronics package and race-bred components, though rivals may suit riders prioritizing lower maintenance costs.

Maintenance: Keeping the Beast Alive

Key Considerations:

• Oil Changes: Use JASO T903 MA2-certified 10W/50 oil. Capacity is 1.2 liters with filter changes every 15-20 hours.
• Valve Checks: Inspect every 30 hours. Intake clearance: 0.10–0.15 mm (0.004–0.006 in), exhaust: 0.12–0.17 mm (0.005–0.007 in).
• Chain Care: The 5/8 x 1/4” chain requires regular lubrication. Adjust tension to 50–55 mm (2.0–2.2 in) of free play.
• Brake Fluid: Replace DOT 4/5.1 fluid annually or after intense track days.
• Cooling System: Use ethylene glycol-based coolant and check levels monthly.

MOTOPARTS.store Recommendations:

• Upgrade to a high-flow air filter for improved throttle response.
• Swap stock sprockets for hardened steel units if racing frequently.
• Install axle sliders to protect those gorgeous Alpina wheels during spills.

Conclusion

The 2021 KTM 450 SMR isn’t just a motorcycle—it’s a gateway to adrenaline-soaked euphoria. From its nuclear reactor of an engine to its chassis that seems to read your mind mid-corner, this bike rewards skill and punishes complacency. While it demands respect (and meticulous maintenance), few machines in the Supermoto arena can match its blend of cutting-edge tech and raw, unadulterated fun.

Whether you’re chasing lap times or just want to own a piece of KTM’s racing legacy, the 450 SMR deserves a spot in your garage. And when it’s time to replace those brake pads or upgrade your suspension, you know where to find us.

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Specifications sheet

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