Positioned in Beta's trial motorcycle lineup, the 2021 Beta Evo Factory 4T 300 utilizes a 297.3 cc (18.1 cu in) liquid-cooled single cylinder, four-stroke layout. Internal engine geometry specifies a bore and stroke of 84.0 x 53.6 mm (3.3 x 2.1 inches) with a 11.1:1 compression ratio.
Rider ergonomics and chassis geometry center around a 660 mm (26 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,305 mm (51.4 in) wheelbase engineered for quick, flickable steering geometry. The 2.8-liter (0.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Beta archive, this model family spans 2 indexed model years from 2021 to 2024, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
660 mm (26 in)
Engine
Displacement297.3 ccm (18.14 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsLamellar induction in the crankcase
Compression11.1:1
Bore x Stroke84.0 x 53.6 mm (3.3 x 2.1 inches)
Fuel SystemCarburettor. Keihin PWK ø 28mm
Lubrication1.5% oil mixture
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet multi-disc clutch with cush-drive rubber
Chassis
Frame TypeHydroformed Alloy
Front SuspensionHydraulic fork with ø38 mm
Front Travel165 mm (6.5 inches)
Rear SuspensionCoaxial tank and compression and rebound adjustment
Rear Travel180 mm (7.1 inches)
Wheelbase1305 mm (51.4 inches)
Ground Clearance310 mm (12.2 inches)
Wheels & Brakes
Front Tyre2.75-21
Rear Tyre4.00-18
Front BrakesSingle disc. Four-piston calipers.
Front Brake Ø185 mm (7.3 inches)
Rear BrakesSingle disc. Two-piston calipers.
Rear Brake Ø165 mm (6.5 inches)
WheelsMIchelin x-light
Dimensions & Weight
Seat Height660 mm (26.0 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
