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While the front shrouds, recently redesigned for RR models as well, remain unchanged in their form, the rear features a new sleek and aggressive tail which, not being a structural component, fits into the new aluminium rear sub-frame and, as previously mentioned, allows access to the filter box via a convenient connection. The fuel tank is a smaller design and has a capacity of around seven litres
The single shock is completely new. It is larger than the one the RR models are equipped with to provide greater support on landings thanks to greater hydraulic damping, and more consistent performance with demanding use, where the temperature tends to rise and so it becomes more complicated to maintain performance.
The RX 450 has a new aluminium rear sub-frame which provides rigidity to the bike despite its light weight, providing the strength needed for demanding needs of motocross. This new component is perfectly integrated with the new filter box, never previously used on Beta models.
The gearbox is five speed, with dedicated ratios, while the clutch (with diaphragm springs, adjustable to three positions) has been designed to withstand the stresses deriving from the engine’s high power output yet still offers a light clutch pull at the lever.
The crankshaft and countershaft are new, as are the cylinder, pistons and timing system, allowing a compression ratio of 13.5:1 to be achieved.
Kayaba, with 48 mm stanchions at the front and 50 mm piston at the rear.
Both components are completely adjustable in terms of their settings, and represent an ideal compromise between rideability and performance, thanks to continuous development on the track.
Access to the filter remains on the left side of the bike, and is extremely easy and intuitive, as well as being tool free.
On the rear the new pump has a reservoir designed in order to leave more space for the exhaust layout
https://www.betamotor.com/en/moto/rx-450-4t/
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