Royal Enfield Guerrilla 450 vs Triumph Speed 400: Why a 40% Tax Didn’t Stop One From Nearly Matching the Other’s Price

The Royal Enfield Guerrilla 450 costs ₹2,51,063 ex-showroom in its base Apex trim. The Triumph Speed 400 costs ₹2,35,327. That ₹15,736 gap should be far bigger than it is: any motorcycle over 350cc now attracts 40 percent GST in India against 18 percent for anything smaller, and Triumph shrank the Speed 400’s engine from 398cc to 349cc in April 2026 specifically to duck under that line. Royal Enfield didn’t bother hiding the Guerrilla 450 from the higher slab, and it still costs barely 7 percent more.

If you’re deciding between these two this festive season, the tax story matters less than engine feel, seat height and safety kit. Here’s what the spec sheets don’t spell out.

Royal Enfield Guerrilla 450 vs Triumph Speed 400: Price and Variants

The Speed 400 is sold in a single configuration, so there’s no variant trap to fall into. The Guerrilla 450 has three, and two of them are the same price.

Why the Speed 400 Is 349cc Now, Not 398cc

India’s September 2025 GST overhaul put motorcycles in two buckets: 350cc and under at 18 percent, everything above at 40 percent, a bracket now grouped with “sin goods” like tobacco. Triumph’s answer, rolled out on India-spec bikes from April 2026, was to cut the Speed 400’s displacement to 349cc, dropping peak power from 39.5 bhp to 36.49 bhp and torque from roughly 37 Nm to 32 Nm.

Royal Enfield took the opposite bet, keeping the Guerrilla 450’s full 452cc engine and absorbing the 40 percent rate. That it still lands within ₹15,736 of the Speed 400 says more about Royal Enfield’s manufacturing scale in India than anything in either brochure.

Claimed vs Real-World Mileage: What Owners Actually Get

Brochure kmpl numbers are claimed figures, not a promise. Here is what each one’s claimed number is, and what real riders and testers have separately reported.

Autocar India did instrument-test a Speed 400 and recorded a combined 32.12 kmpl, but that was on the original 398cc bike before the April 2026 downsize. Carrying that number over to a different engine would be dishonest, so treat the claimed 28-29.7 kmpl as the only figure that applies to the bike on sale now. The Guerrilla’s 11-litre tank is its biggest practical weakness: even at the better end of its real-world mileage, it needs fuel roughly 40 km sooner than the Speed 400’s 13-litre tank allows.

Engine Feel and the One Safety Feature the Guerrilla Skips

On paper the two are close: 39.5 bhp plays 36.49 bhp, a gap you won’t feel at Indian city speeds. Torque favours the Guerrilla, 40 Nm against 32 Nm, a 25 percent edge that means less gear-shuffling in traffic and stronger roll-on overtakes. The Speed 400 answers with switchable traction control, which no Guerrilla variant offers at any price. On wet monsoon tarmac or loose highway shoulders, that’s a real safety gap, not a spec-sheet footnote.

Seat height splits the other way: the Guerrilla’s 780mm seat suits riders under 170cm better than the Speed 400’s 803mm. The Triumph claws it back on weight, 179 kg kerb against the Guerrilla’s 185 kg, which shows up most in low-speed U-turns and parking-lot shuffling.

Buy the Guerrilla 450 Apex for the torque and the seat height. Buy the Speed 400 if you want traction control and don’t want to think about variants at all.

Which Variant Is Actually Worth Buying

For the Guerrilla 450, it’s the Apex, full stop. It carries the identical ₹2,51,063 price as the Dash and only trades tyre brand, not capability. The ₹23,460 jump to the Flash buys paint and a second tyre choice, nothing that changes how the bike rides or what safety kit it carries. For the Speed 400, the question doesn’t exist: Triumph sells exactly one version, so the only real decision is the paint shade.

Run the Guerrilla 450 EMI calculator before you book: the Apex-to-Flash gap is exactly the upsell a showroom pushes hardest when the down payment looks small on paper.

Service Costs: The Bajaj Factor

Bajaj Auto, which runs Triumph’s small-displacement service network in India, has said Speed 400 maintenance will cost less per visit than Royal Enfield’s, per reporting by Bikeadvice.in and Rushlane. Royal Enfield’s own 10,000 km service pricing typically runs ₹2,000 to ₹2,700 depending on the model. Neither company has published a rupee figure for the Speed 400’s actual bill, so budget conservatively until a dealer invoice confirms it.

Both bikes sit in the same shopping basket as everything else in this price band; see our full list of bikes under ₹3 lakh if you’re still weighing a third option. For a straight spec-by-spec readout alongside this review, our Guerrilla 450 vs Speed 400 comparison tool lays both spec sheets side by side.

Frequently Asked Questions

Is the Royal Enfield Guerrilla 450 worth ₹15,736 more than the Triumph Speed 400?

Yes, if the extra torque, lower seat height and larger 452cc engine matter to you, since that’s a real 7 percent price difference for a bike taxed at more than double the Speed 400’s GST rate. If switchable traction control and a lighter kerb weight matter more, the Speed 400 is the better buy at a lower price.

Why did Triumph reduce the Speed 400’s engine size in 2026?

India’s September 2025 GST reform taxes motorcycles over 350cc at 40 percent versus 18 percent for smaller ones. Triumph cut the Speed 400 from 398cc to 349cc from April 2026 to keep it in the lower tax bracket, which cost the bike roughly 3 bhp and 5 Nm of torque.

Which has better real-world mileage, the Guerrilla 450 or the Speed 400?

The Guerrilla 450 has published real-world data: 23-28 kmpl from owner reports aggregated by BikeWale, against a 29.6 kmpl ARAI claim. No independent real-world test of the current 349cc Speed 400 has been published yet, so its claimed 28-29.7 kmpl figure from Triumph remains unverified in real conditions.