Top 5 Fastest 300–400cc Sport Bikes of 2026 | R3 vs Ninja 300 vs G 310 RR vs CBR300R vs RC 390

Looking for an exciting lightweight sport bike in 2026? In this video, we compare five popular motorcycles from the 300-400cc performance category. The Yamaha YZF-R3, Kawasaki Ninja 300, BMW G310RR, Honda CBR300R, and KTM RC390. We'll look at engine size, performance, design, features, riding character, and overall appeal to see what makes each bike stand out. Performance figures can vary by market and riding conditions, so consider this a general comparison before making your final choice. Number 5. KTM RC390. The KTM RC390 stands apart from the other motorcycles in this comparison, with its larger 373cc engine and aggressive track-inspired design. Although it is above the traditional 300cc class, its lightweight sport bike format makes it a natural competitor in the broader 300-400cc segment. The RC390 is known for its performance-focused character, sharp styling, and racing-inspired riding position. Its larger engine gives it a clear displacement advantage over models such as the Ninja 300 and CBR300R, while its sporty design targets riders who want a more aggressive experience. For buyers comparing lightweight performance motorcycles in 2026, the RC390 deserves attention for its combination of engine capacity, sporty chassis concept, and distinctive KTM design. Always verify the latest specifications and local equipment before making a purchase. Number 4. Honda CBR300R. The Honda CBR300R is a lightweight sport motorcycle that focuses on simplicity, approachable performance, and Honda's familiar CBR styling. Its single-cylinder engine provides a straightforward riding experience, while the full fairing gives the motorcycle a distinctly sporty appearance. Compared with larger and more powerful machines, the CBR300R can be an appealing option for riders who want a manageable motorcycle for everyday riding, while still enjoying the look and feel of a sport bike. Its relatively compact size also makes it suitable for riders who prioritize easy handling and practical usability. When comparing it with bikes such as the Yamaha R3, Ninja 300, BMW G310RR, and KTM RC390, factors such as engine configuration, power delivery, weight, comfort, price, and availability can be just as important as outright speed. Number 3. BMW G310RR. The BMW G310RR adds European-inspired sport bike styling to the lightweight performance class. It is powered by a 312.12cc single-cylinder, liquid-cooled engine, and offers different riding modes that change its performance characteristics. BMW Motorrad lists 34 PS and a maximum speed of 160 kmh in track and sport modes, while rain and urban modes provide a more relaxed output. The G310RR is designed to deliver an engaging riding experience with a sharp appearance inspired by BMW's larger RR models. Its compact engine size, sporty ergonomics, and technology-focused approach make it an interesting alternative to twin-cylinder competitors. Riders should always check the exact specifications and equipment available in their country because features and configurations can vary by market. Number 2. Kawasaki Ninja 300 ABS. The 2026 Kawasaki Ninja 300 ABS brings classic Ninja styling into the lightweight sport bike segment. It uses a 296cc liquid-cooled parallel twin engine with a 6-speed transmission and produces 38.9 horsepower according to Kawasaki's 2026 U.S. specification sheet. The bike also features ABS, a 290mm front disc brake, and a 220mm rear disc brake, giving riders additional braking support. With its twin-cylinder engine, aggressive fairing design, and approachable dimensions, the Ninja 300 remains an attractive choice for riders looking for a combination of sporty looks and everyday usability. It may appeal to beginners and experienced riders who prefer a smaller, lighter motorcycle. Actual performance can vary depending on rider, conditions, and market specification, so compare the latest local details before buying. Number 1. Yamaha YZF-R3. The 2026 Yamaha YZF-R3 is one of the most recognizable lightweight sport bikes in this category. It features a 320cc liquid-cooled DOHC two-cylinder engine paired with a 6-speed transmission. Yamaha lists 42PS for the European model, along with a lightweight chassis and aerodynamic supersport styling inspired by the brand's racing design language. The R3 is designed to offer a balance between everyday usability and sporty performance, making it appealing to riders who want an accessible sport bike with premium styling. Its ABS-equipped braking system, inverted front fork, and compact dimensions add to its practical performance package. Whether you are a newer rider or simply want a lightweight motorcycle with a sporty character, the R3 remains a strong option to consider. Always check local specifications, pricing, and availability before purchasing.