Engineered by Ktm for the minibike, cross motorcycle segment, the 2021 Ktm 65 SX pairs a 64.9 cc (4 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 45.0 x 40.8 mm (1.8 x 1.6 inches).
On the scales, the 65 SX measures 53 kg (117 lbs) dry. Rider ergonomics and chassis geometry center around a 750 mm (29.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,270 mm (50 in) wheelbase engineered for quick, flickable steering geometry. The 3.5-liter (0.9 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Ktm archive, this model family spans 22 indexed model years from 2003 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
750 mm (29.5 in)
Engine
Displacement64.9 ccm (3.96 cubic inches)
Engine TypeSingle cylinder, two-stroke
Bore x Stroke45.0 x 40.8 mm (1.8 x 1.6 inches)
Fuel SystemCarburettor. Mikuni TMX
IgnitionMEDJ digital EMS
LubricationMixture oil lubrication
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet, multi-disc clutch, Formula hydraulics
Driveline1/2 x 5/16
Chassis
Frame Type25CrMo4 steel central-tube
Rake25.5°
Front SuspensionXACT 43 WP Upside-Down fork, Ø 43 mm
Front Travel215 mm (8.5 inches)
Rear SuspensionXACT WP mono shock
Rear Travel270 mm (10.6 inches)
Wheelbase1270 mm (50.0 inches)
Ground Clearance280 mm (11.0 inches)
Wheels & Brakes
Front BrakesSingle disc
Front Brake Ø198 mm (7.8 inches)
Rear BrakesSingle disc
Rear Brake Ø160 mm (6.3 inches)
Dimensions & Weight
Dry Weight53.0 kg (116.8 pounds)
Seat Height750 mm (29.5 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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
