Engine architecture
Inline triple throughout
Both Rocket generations use longitudinal inline triples — three cylinders pointing forward, like a small car engine. Unique in motorcycling. Capacity grew 2294cc → 2458cc in the 2020 redesign — pushing the production motorcycle displacement record even higher.
Largest production motorcycle engine
2458cc
The 2020 Rocket 3 launched with a 2458cc engine — the biggest production motorcycle engine ever made. To put that in perspective: a 2018 Toyota Yaris had a 1500cc engine. The Rocket 3 has more displacement than most family cars.
Torque output
221 Nm
Peak torque of 221Nm. To put that in perspective: most superbikes make 100-115Nm. A KTM 1390 Super Duke makes 145Nm. The Rocket 3 makes more torque than any other production motorcycle by a clear margin. The bike feels different to ride because of it — endless surge of acceleration in any gear.
Power gain
+38bhp
142bhp original Rocket III → 180bhp Rocket 3 (2020+). The 2020 redesign added more capacity, more peak power, but kept the same peak torque figure. The new bike just makes the torque higher in the rev range.
Weight loss
−26kg
320kg dry original Rocket III → 294kg wet Rocket 3. The 2020 redesign cut weight despite adding capacity — better materials, more compact engine packaging, lighter chassis. Modern Rocket is genuinely more agile than the original despite the engine still being enormous.
Real cost change
+£6.1k
Original Rocket III was £11,000 in 2004 (£18,500 today). Rocket 3 Storm GT is £24,595 for 2026 — about 33% more in real terms. Reflects the move from novelty engine to premium flagship cruiser with full electronics and TFT.
Cheapest way in
£5k
A clean original Rocket III from 2004-2010. The bike that started the displacement war. 2.3 litres, longitudinal triple, shaft drive, indestructible. Probably the most underpriced 2-litre+ motorcycle on the UK used market.
