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Only one Harley-Davidson in the cited specifications clearly exceeds the 2026 Kawasaki Ninja ZX-6R’s published 127.0 hp: the 2025 CVO Road Glide RR, listed at 153 hp. The 2025 CVO Road Glide ST is listed at 127 hp, a numerical match—not more. Neither Harley exceeds the 2025 Kawasaki Ninja ZX-10R’s 196.0 hp. So the claim that ten Harley-Davidson bikes are more powerful than an unnamed inline-four sportbike is not supported: the answer depends on which sportbike and what “powerful” means.
Why the comparison needs a specific sportbike
Inline-four describes an engine layout, not a power class. Kawasaki’s official U.S. specifications list the 2026 Ninja ZX-6R at 127.0 hp at 13,000 rpm and the 2025 Ninja ZX-10R at 196.0 hp at 11,500 rpm. A Harley can exceed the first figure without coming close to the second.
For a peak-horsepower comparison, the available official figures support one Harley-Davidson above the ZX-6R benchmark, one at the same stated horsepower, and no Harley above the ZX-10R benchmark. The manufacturer pages do not establish a common cross-brand measurement protocol, so these published numbers are useful for a stated-spec comparison, not proof of identical testing or real-world performance.
How the listed models compare on published horsepower
| Motorcycle and model year | Published horsepower | Published torque | Comparison with 2026 ZX-6R |
|---|---|---|---|
| Harley-Davidson CVO Road Glide RR, 2025 | 153 hp | 150 ft-lb | Higher by listed peak horsepower |
| Harley-Davidson CVO Road Glide ST, 2025 | 127 hp | 145 ft-lb | Same numerical horsepower |
| Harley-Davidson Street Bob, 2025 | 98 hp at 4,600 rpm | 120 ft-lb at 2,500 rpm | Lower by listed peak horsepower |
| Harley-Davidson Sportster S, model year not established by the cited media material | 121 hp | A directly comparable model torque figure is not stated in the cited passage | Lower by listed peak horsepower |
| Kawasaki Ninja ZX-6R, 2026 | 127.0 hp at 13,000 rpm | 52.1 lb-ft at 10,800 rpm | Reference point |
| Kawasaki Ninja ZX-10R, 2025 | 196.0 hp at 11,500 rpm | Not stated on the cited product specification used here | Higher than each Harley figure listed above |
Sources: Harley-Davidson 2025 CVO Road Glide RR specifications, Harley-Davidson 2025 CVO Road Glide ST specifications, Harley-Davidson 2025 Street Bob specifications, Harley-Davidson Sportster S media material, Kawasaki 2026 Ninja ZX-6R specifications, and Kawasaki 2025 Ninja ZX-10R specifications.
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Which Harley-Davidson exceeds the ZX-6R?
2025 CVO Road Glide RR: higher on the published figures
Harley-Davidson lists the CVO Road Glide RR at 153 hp and 150 ft-lb of torque. That is 26 hp above the 2026 ZX-6R’s published 127.0 hp, comparing the manufacturers’ stated figures. Harley-Davidson describes its engine as “The most powerful Milwaukee-Eight® engine ever factory-installed in a Harley-Davidson® motorcycle.” This is a touring motorcycle, so a peak-horsepower difference alone does not establish that it accelerates faster, reaches a higher top speed, or is superior on a track.
2025 CVO Road Glide ST: a match, not an exceedance
The CVO Road Glide ST is listed at 127 hp and 145 ft-lb. Its stated horsepower numerically matches the ZX-6R’s 127.0 hp; it should not be counted as more powerful on this metric. The Harley’s larger torque figure is a different measurement and does not change the horsepower comparison.
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Why torque and engine size do not make a ten-bike list
Horsepower and torque describe different aspects of engine output and are reported in different units. Harley-Davidson lists the 2025 Street Bob at 98 hp at 4,600 rpm and 120 ft-lb at 2,500 rpm. Its torque figure is substantial, but it does not exceed the ZX-6R on published peak horsepower. Likewise, the Sportster S media material gives a 121 hp figure, below the ZX-6R benchmark; its statement about up to 10% more torque from 3,000 to 6,000 rpm concerns engine development and does not supply a directly comparable model torque figure.
Displacement, torque, and horsepower should not be substituted for one another when the claim is specifically that one motorcycle is “more powerful.” A defensible list needs the same named metric for every model, with model year and manufacturer attached to each figure.
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What the available specifications do—and do not—show
The cited official specifications do not establish ten distinct Harley-Davidson models with horsepower above the ZX-6R’s 127.0 hp, and they establish none above the ZX-10R’s 196.0 hp. The available Harley figures include only one model above the ZX-6R, one matching it, and two below it. These are manufacturer-published figures, not a shared cross-brand test; they cannot by themselves settle acceleration, top speed, or track performance.
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- Highly-detailed die-cast precision model for collectible or play
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