well since noone answered i tried to look up more info
The CBR 300 R is a bigger CBR 250 R. The length of the CBR 300 R is 2035 mm, width is 720mm and height is 1120mm. When we compare it to the CBR 250 R, the length is increased by 3 mm, width is same and height decreased by 7mm. Honda has made the CBR 300 R lighter than the CBR 250 R. Honda CBR 300 R weights 164 Kgm which is 6 kgm lighter than the CBR 250 R. Honda has increased the wheelbase of CBR 300 by 13mm. The wheelbase of CBR 300 R is 1380mm. The ground clearance of both CBR 300 R and CBR 250 R is the same which is 145mm. Honda has given same wheels for the CBR 300 R from the CBR 250 R. 110/70-17M/C for the front and 140/70-17M/C at the rear.
Now the big part of the story which is the engine. The Honda CBR 300 R is powered by a 286 cc DOHC 4 valve single cylinder fuel injected engine which makes 30.4 BHP of power at 8500 RPM and torque of 27 NM at 7250 RPM. From CBR 250 R, Honda has increased the power by 5.4 BHP and torque by 4 NM. This engine is mated to 6 speed gear transmission. Honda has given disc brakes at front and rear. Honda is giving the ABS as an option.
In design Honda has completely changed the front of the CBR 300 R. The front headlamps and visor design is inspired from higher CBR models. Compared to CBR 250 R this is far more aggressive and edgy. The rest of the panels have given a minor tweak. The instrument cluster and the handlebar are also same from the CBR 250 R. Overall, the CBR 300 R is a tweaked version of the CBR 250 R. We can expect the Honda CBR 300 R next year in India.