Both the Yamaha R15 V4 Dark Knight and the Yamaha R15 V4 Racing Blue are powerful and stylish bikes. The R15 V4 Dark Knight has a liquid-cooled 155 cc engine that can generate up to 19.3 bhp of power at 10,000 rpm and 14.7 Nm of torque at 8500 rpm. The bike has a six-speed gearbox and a wet multi-plate clutch. The R15 V4 Racing Blue, on the other hand, has a liquid-cooled 155 cc engine that can generate up to 19.3 bhp of power at 10,000 rpm and 14.7 Nm of torque at 8500 rpm. It also has a six-speed gearbox and a wet multi-plate clutch.

The main difference between the two is their design. The R15 V4 Dark Knight is more aggressive and sporty in its design, while the R15 V4 Racing Blue is more sleek and stylish. The R15 V4 Dark Knight is available in four colours - Racing Blue, Matte Red, Matte Black and a new Matte Grey. The R15 V4 Racing Blue is available in three colours - Racing Blue, Matte Red and Matte Black.

When it comes to features, both bikes share a lot of features like LED headlamps, digital instrument cluster, slipper clutch and single-channel ABS. However, the R15 V4 Dark Knight has a few additional features like the