The Art of Rideability in the MX World
Beta's project to expand the horizons of Rideability enter a new dimension – Motocross! It is the first modern
motocross bike built by the Italian manufacturer since the early 1980’s, represents the first chance in
Europe for enthusiasts to ride a Beta Motocross bike, after its début in the MXGP World Championship three
years ago.
We are talking about Beta RX 300 2T, the new frontier of Rideability in the World of MX.
What does Rideability mean for Beta? It means allowing every rider of a Beta bike to have a simultaneously
easy-to-ride yet high-performance bike, a top-level performer, yet friendly, fun, and never too demanding.
Today, for the first time, Beta is taking this concept to modern Motocross.
The 300 RX is completely new for the European market, however many already know about it, at least by
brand purists, who will have seen it in some shots stolen from the US market.
RX 300 2T is a bike which was launched as an exclusive motocross bike for the US market in 2021. The success
of this project, aided by the ever-growing experience accumulated in the race field in the MXGP World
Championship with the 450 4T, have led the Tuscan brand to open the throttle on the evolution of the bike
which today is configured as a fully-fledged motocross bike. This limited production model will be produced
for the first time outside the US make the RX 300 2T a unique opportunity to add the first European version
of this bike to your garage, a model which for Beta marks the return to the motocross market and which will
open the way for a new range of totally new vehicles arriving soon.
The RX 300 2T is a unique bike in its genre, the perfect combination of power and control, therefore a vehicle
which is born with a racing spirit due to it being dedicated to the race track. It still features the ease of use
typical of the Betamotor family, however, fully focused on fun without compromises.
The all-new RX 300 was designed for the moto-minder rider looking for the style and performance that can
only come from Beta of Italy. The “factory bike sound” coming from the muffler sets this model apart from
the rest of the brands on the track. Many Beta engineers come from a motocross background which allows
them to exercise their talents.
Engine: The engine of the RX 300 offers a high level of performance, especially on the mid-range and top
end of the power delivery, yet still provides excellent torque thus offering an enjoyably progressive drive
which is always under control, focusing on the concept of docility in all situations.
The main characteristic details of the RX 300 2 Strokes are as follows:
- Cylinder: Bore and x Stroke of 72.0 x 72.0 mm.

• Piston: dual-ring design and matched perfectly to the RX cylinder porting.
  - Carburettor: Keihin PWK 38 mm.
  - Dedicated spark plug: NGK BR8ECM.
  - Crankshaft: this component has been lightened with a reduced diameter married to the engine main
  cases exclusive to the RX to provide faster acceleration at higher engine speeds.
  - Exhaust valve: an adjustable valve that changes the power delivery at drastic levels providing the
  tune-ability for riders of all abilities.
  - Short silencer: to favour performance at medium-high engine speeds.
  - Hydraulic Clutch with diaphragm spring: provides a smooth operation, easy pull and resistant to
  overheating. The spring preload for the clutch can be set to three positions which changes the
  progression of the clutch. by adjusting a dedicated ring inside the clutch cover.
  - Cooling lines: high-performance models in blue silicone.
  - MAP Switch: two-positions that provide the rider with two different engine power deliveries. This
  system is independent of the adjustable power valve providing the rider with an amazing amount of
  engine power adjustability.
  - Exhaust: special plated exhaust for a beautiful look and low maintenance after each moto.
  As regards the vehicle's frame:
  Fork and shock: are Kayaba (KYB). This suspension package is exclusive to the RX model. Beta engineers
  worked closely with Kayaba to develop the perfect settings based on the overall RX model’s geometry. The
  goal was to provide a package stiff enough for the big hits yet supple and soft over the chop that many
  motocross tracks develop.
  The wheels are 21” at the front and 19” at the rear, with 80/100-21 and 120/80-19 Michelin Starcross 6 tyres,
  while the braking system is by Nissin with floating callipers and a 260mm disc on the front and 240mm at
  the rear.
  Electric Start: fires to life at the push of a button, matched to the light weight of a lithium battery will make
  your friends kick starting their 2 strokes envious
  Rounding off the model’s specifications:
  The electrical components, including the main wire harness, are at a bare minimum to reduce weight. Starter
  button and kill switches are handlebar mounted.
  There are then some special components which enhance the bike's trim level:
  - Chain tensioners in red Ergal alloy
  - Blue anodised Excel rims
  - Red chain guide
  - Red anodised dual-material sprocket
  - Black Ergal alloy footpegs with steel pins
  - Handguard
• Rounding off the package are brand-new graphics, featuring typical Racing colours, to make a unique model
  in the Beta range stand out.