Royal Enfield Guerrilla 450 vs Triumph Speed 400: Which Modern Roadster Should You Buy?

Royal Enfield Guerrilla 450 and Triumph Speed 400 have been fighting for the same buyer's attention for a while now, and that fight has only gotten more interesting recently. Triumph has downsized the Speed 400's engine to 349cc to eliminate the higher GST that kicks in above 350cc, and that single change has genuinely shifted the equation between these two. The Guerrilla still runs the bigger 452cc Sherpa engine and is priced accordingly, while the Speed 400 now undercuts it by a real margin. I've spent time with both, riding them in the city, on the highway, and through some proper corners, so let's actually break down which one deserves your money.

Design and Road Presence

The Guerrilla 450 wears its scrambler-inspired design loud and proud, a wide handlebar, an exposed rear tyre, chunky proportions, and paint schemes that don't shy away from attention. It's the physically bigger, more dominant looking bike of the two.

On the other hand, the Speed 400 carry a simple, slim, and modern look impressive quality at this price. The upside-down front forks and the neatly shaped fuel tank give it a clean, classy look too. Design is subjective, but if you want something that turns heads, the Guerrilla wins; if you want something that looks expensive and grown-up, the Speed 400 pulls it off better.

Engine and Performance

If we talk about on paper comparison the Guerrilla's definitely wins because of its bigger engine that churns out more power and a healthy 8Nm torque advantage over the now-smaller Speed 400. That gap shows up on the road too, but not in the way you'd expect from spec sheets alone. Ride the Guerrilla and you feel that torque the moment you're past 3,000rpm, the Sherpa engine genuinely wakes up and wants to be revved out. It's playful, occasionally a little coarse at low revs, and demands you keep it in the sweet spot while filtering through traffic, but it rewards you with real excitement once you do.

Whereas, the Speed 400, in its new 349cc form, brings different things to the table. It is one of the most relaxed and tractable motor i have ridden so far, happy to be short-shifted and cruised around town without any fuss whatsoever. Credit goes to Triumph's engineers here, this smaller motor gives away surprisingly little against the outgoing 398cc unit, and acceleration off the line even feels a touch smoother now than before. All in all, if engine matter to you the most so go for Guerrilla's engine it will give you the outright thrill but if you want something that's simply more pleasant to live with day after day, the Speed 400 makes the stronger case.

Guerrilla 450 Vs Speed 400: Features

Royal Enfield leans harder into tech here, with a proper TFT cluster and navigation support on the higher variants, while Triumph keeps things simpler but doesn't skimp on the essentials. Both get dual-channel ABS and a slip & assist clutch as standard, so the fundamentals are sorted either way.

Braking, Suspension and Ride Quality

The Guerrilla runs a 43mm telescopic fork up front with 140mm of travel, a Showa-sourced linkage-type monoshock at the back. As for the Speed 400 it counters with proper 43mm USD Big Piston forks, a gas-charged monoshock with a preload adjuster, and a 300mm front disc. In braking front the Triumph's setup looks more premium, and those gold-finished USD forks certainly look the part. In the real world though, the Guerrilla's suspension tune is the more accomplished one for Indian roads. It runs firmer and doesn't wallow over broken patches, staying composed rather than pitching you around, and it feels genuinely eager to be leaned into a corner despite carrying the extra weight, this chassis was tuned to be fun.

The Speed 400's softer setup feels pleasant at low speeds and on smooth tarmac, but it turns noticeably bouncy the moment the road quality drops, which, let's be honest, is most of India. Braking bite is strong on both motorcycles, but I'd give the Guerrilla a slight edge in outright feel and stopping power.

Price, Variants and Colour Options

Now pricing is where there is noticeable difference in these two the Guerrilla 450 is priced from Rs 2.49 lakh and climbs to Rs 2.72 lakh, ex-showroom, spread across three trims, Analogue, Dash and Flash, differentiated mainly by their instrument cluster and paint options. Colours range from a subtle Smoke on the base Analogue trim to punchier choices like Brava Blue and Yellow Ribbon on the range-topping Flash variant.

The Speed 400, meanwhile, starts noticeably lower because of the downsizing it comes at around Rs 2.34 lakh, ex-showroom, and comes in a single, well-equipped variant. Triumph offers it in four colour options, Phantom Black, Pearl Metallic White, Racing Red and Racing Yellow, each paired with contrasting panels that lift the premium feel further. If your budget is genuinely tight, the Speed 400's lower starting price and simpler single-variant lineup make the decision that much easier.

Verdict