The 2013 Aprilia RS4 125 sport bike in this engine class with a 4-stroke engine allow young enthusiasts to take advantage of the maximum levels of technological innovation, chassis efficiency, active safety and component quality. The 2013 Aprilia RS4 125 the looks of the Factory version of the supersports bike. The 2013 Aprilia RS4 125 bikes have a decidedly aggressive look that lends a unique character to the entire front end. The new 2013 Aprilia RS4 125 confirms its global leadership in the small capacity sports and young-targeted bike segment, creating models that exceed the expectations of even the most discerning rider. The 2013 Aprilia RS4 125 is powered by an all new 125 cc water cooled 4 stroke single cylinder engine with four valves and electronic engine boasting a sophisticated double overhead camshaft valve timing system. The 2013 Aprilia RS4 125 boast class beating brake systems each bike uses a 300 mm steel disc at the front, gripped by a four piston radial calliper, and a 220 mm disc at the rear with a single piston calliper. The 2013 Aprilia RS4 125 has a 17 wheels are shod with 100/80 rubber up front and a 130/70 tyre at the rear. The 2013 Aprilia RS4 125 while the design of the split 6-spoke design of the wheels further emphasises the purposeful character of Aprilia's latest small capacity sports bikes.