2026 Rieju MR Pro 300i Review

Rieju has just provided enduro bike enthusiasts and riders with a significantly upgraded option through its new MR Pro 300i, a genuinely modern motorcycle from the historic Spanish manufacturer.

This model represents the top-tier choice in its new MR 300i lineup for 2026, alongside the somewhat less flashy MR Racing 300i ($10,399). You might know Rieju as the “old” GasGas, or simply as the factory that kept churning out enduro-specific two-strokes from GasGas’ former ownership and model lineup days. These bikes were effective and competitive but aging in a market full of technological and comfort advancements.

Well, those days are clearly over as Rieju prepares to write its own legacy with this cutting-edge and impressively well-equipped 300cc enduro weapon.

The new MR Pro 300i is virtually all-new, starting at the most important piece of any two-stroke woods ripper—the engine! Embracing modernity and pushing innovation, Rieju has revealed a 298cc TFI (Throttle-Body Fuel Injection) powerplant equipped with dual Bosch injectors, each specifically tasked with delivering pre-mix at unique rpm. The engine-management system comes standard with three power maps accessed by a handlebar switch (Race, Forest and Wet), effectively tuning the two-stroke punch for desired traction and response. Syncing with the motor’s fueling brain is a new electronic exhaust valve feeding the Spanish-made OXA exhaust. Power output is transported to the rear via a new six-plate diaphragm clutch and six-speed gearbox. Additionally, Rieju has equipped the MR Pro 300i with a counter-rotating balance shaft to cut the hand-numbing shake and rattle of old-school smokers.

The engine performance is inspiring and so, so fun. Running clean and sounding mean—from slow, technical riding to ripping sand washes wide-open—the new Rieju is a breath of fresh Spanish air. This bike retains the carbureted grunt of the 300cc class but provides the now-expected clean delivery of EFI at any rpm. The motor is a hit, feeling in control like the best of them while navigating the slow and fun stuff, and possibly spicier than others on rpm pickup. We can’t wait to get it into a comparison.

The chassis is all-new, too. Featuring a 48mm Air-Oil Separated (AOS) KYB fork slicked up with black DLC-coated/anodized lowers and a fully adjustable KYB linkage-mounted shock, the bike feels lively and planted with confident bottoming reserves for those unexpected or miscalculated drop-offs and G-outs. It also seems to retain small-bump compliance when chasing single-track. It’s an inspiring ride in all. The very familiar feel of a chromoly frame and aluminum swingarm instills confidence here.

Premium-build components are aplenty in the Pro version tested here, but even the standard “Racing” version comes equipped with a skid plate, X-ring chain and lithium battery. Opt for this Pro version and you’ll get nice upgrades, including a Renthal Fatbar handlebar with Renthal grips, Polisport handguards, Xtrig ROCS triple clamps, red machined hubs laced to Excel wheels and an electric fan installed. The new Rieju MR Pro 300i certainly looks like a factory race bike.

It’s going to be interesting to see how this bike handles the highest levels of competition since it’s such a big step up from the previous models Rieju offered.

Rieju races a lot. Domestically in North America, racers such as EnduroCross and hard enduro veteran Quinn Wentzel and Rachel Gutish are flying the Rieju flag. Gutish, when she’s not winning the Women’s class at the Tennessee Knockout, she is full-timing at the EnduroGPs alongside other Factory Rieju women’s class contenders Mireia Badia of Spain and Rosie Rowett of the UK. Internationally, Poland’s Dominik Olszowy, Spain’s Alex Puey and the UK’s Toby Martyn keep the Rieju Factory Team competitive in EnduroGP and SuperEnduro races. This bike is so new that many of these riders are just recently getting their first races on production machines. Rieju also recently announced that all their competitors for this year’s ISDE will be racing with the new Rieju MR 300i injection technology.

Time will certainly tell how this bike handles the intense heat of enduro competition at the highest levels. But judged from our quick spin on this bike, we think it has a very bright future.CN

2026 Rieju MR Pro 300i Specifications

Click here to read the 2026 Rieju MR Pro 300i Review in the Cycle News Digital Edition Magazine.

 

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