Bikes 8 Jun 2024

Detailed: 2025 Beta RX range

Motocross models receive a mixture of updates for next season.

Beta has released a first look at its updated 2025 model RX 450 and RX 300 line-up, the Italian brand continuing to develop and build upon its entry into the motocross market.

While the RX 450 four-stroke stole much of the headlines this year as the manufacturer’s first motocross-specific bike released, the RX 300 two-stroke – previously derived from the enduro model – has received a series of upgrades.

For 2025, the RX 300 has undergone a series of important improvements to the engine, suspension and frame, which totally breaks away from the enduro world, and like the RX 450, it’s become a purpose-built bike, dedicated to motocross.

‘RideAbility’ is the core of Beta’s development target, meaning that the RXs should suit a broad range of riders, while maintaining a high level of performance capabilities. Collectively, they both benefit from data gained in competition, including the MXGP World Championship and American Supercross.

The 2025 Beta FX 450 has a revised sub-frame and air filter housing, being reinforced in a series of points that stiffen and strengthen the structure. There’s also a new lithium battery has been mounted on the RX 450, with a higher amperage that delivers instant starting power.

Its KYB suspension package has received new settings that enhance feel, both in terms of handling and stability, and the gearing sees an additional tooth – up from 50 to 51 – for increased response off the bottom-end of the power range.

In addition, the 2025 Beta RX 300 has a new frame, specifically dedicated to motocross that receives a wider main spar (10mm), redesigned and reinforced sections compared to the enduro models that it was previously based upon. It also has different engine mounts and positions.

It too has a new aluminium sub-frame and air filter housing, a 48mm KYB fork and KYB shock, an enhanced Nissin braking system with a 260mm front disc and 240mm at the rear (the caliper is from the RX 450 and rear master cylinder from the RR Racing enduro line), and a redesigned radiator.

The all-new engine consists of a new cylinder, a new head with greater compression and modified intake crankcases to increase ventilation. This results in significantly more power than that of the previous model, plus there is an updated five-speed gearbox, and new exhaust system.

Both the RX 450 have new ‘silent’ handlebar blocks that reduce vibration and raise them by five millimetres, plus they have improved footpegs, a reinforced swingarm that elevates rigidity, plus engine mapping has been refined with two specific maps (dry/wet), and the 450 has traction control.

The 2025 Beta RX motocross range is scheduled to arrive in Australia this September, with pricing yet to be announced. Visit for additional information on the latest models.