2026 Triumph TF250-X
General Specifications
| Model | Triumph TF 250-X |
| Year | 2026 |
| Category | Motocross |
| Engine Type | Single-cylinder, liquid-cooled, DOHC, 4-valve, 4-stroke |
| Weight | 104 kg wet |
Engine
| Displacement | 249.95 cc |
| Bore x Stroke | 78.0 x 52.3 mm |
| Compression Ratio | 14.4:1 |
| Fuel System | Dell'Orto 44 mm throttle-body electronic fuel injection with Keihin injector and Athena engine management |
| Ignition | Athena ECU-controlled electronic ignition with dual engine maps, launch control and traction control |
| Spark Plug | NGK LMAR9AI-8 (previous TF 250-X service specification; verify MY26 factory fitment) |
| Spark Plug Gap | 0.8 mm (previous TF 250-X specification; confirm MY26 service requirement) |
| Cooling System | Liquid-cooled with mechanically driven coolant pump and twin radiators |
| Starting System | Electric start |
Transmission
| Transmission | 5-speed manual with standard quickshifter for clutchless upshifts from second to fifth gear |
| Clutch | EXEDY wet multi-plate clutch with Belleville spring, revised clutch hub and Brembo hydraulic actuation |
| Final Drive | D.I.D 520 SDH chain with 13-tooth front and 48-tooth rear sprockets |
Dimensions
| Overall Length | |
| Overall Width | 836 mm across handlebars |
| Overall Height | 1270 mm |
| Wheelbase | 1492 mm |
| Ground Clearance | |
| Seat Height | 960 mm |
| Fuel Capacity | 7.0 litres |
Chassis
| Frame | Lightweight aluminium spine and double-cradle frame with fabricated aluminium swingarm and revised rear suspension linkage |
| Front Tyre | 80/100-21 Pirelli Scorpion MX32 Mid Soft | Tyre Size Guide |
| Rear Tyre | 100/90-19 Pirelli Scorpion MX32 Mid Soft | Tyre Size Guide |
Suspension
| Front Suspension | 48 mm KYB Air-Oil Separate (AOS) inverted coil-spring forks with revised 2026 compression and rebound damping settings | Fork Oil Levels |
| Front Suspension Travel | 310 mm |
| Rear Suspension | KYB piggyback monoshock with 50 mm piston, revised linkage, adjustable high-speed and low-speed compression damping and rebound damping |
| Rear Suspension Travel | 305 mm |
| Fork Oil | KYB AOS-compatible suspension fork oil. Exact MY26 factory-approved viscosity, inner-cartridge oil quantity and outer-chamber fill volume not independently confirmed; use the Triumph workshop manual for servicing. |
Brakes & Wheels
| Front Brake | 260 mm Galfer disc with Brembo floating twin-piston caliper, 24 mm pistons |
| Rear Brake | 220 mm Galfer disc with Brembo floating single-piston caliper, 26 mm piston |
| Front Wheel Size | 21 x 1.60-inch D.I.D DirtStar 7000-series aluminium spoked rim |
| Rear Wheel Size | 19 x 1.85-inch D.I.D DirtStar 7000-series aluminium spoked rim |
Service Data
| Fuel Type | Premium unleaded petrol meeting the minimum octane rating specified in the 2026 Triumph owner's handbook |
| Premix Information | Not applicable. Four-stroke engine with pressure-fed lubrication; do not mix two-stroke oil into the petrol. |
| Gearbox Oil | Fully synthetic SAE 10W-50 motorcycle engine oil meeting API SN or higher and JASO MA2, as specified in earlier TF 250-X service documentation. Engine and gearbox share the same lubricant. Previously published refill quantities: 0.85 litres without oil-filter replacement, 0.95 litres with oil-filter replacement and 1.0 litre dry fill. Verify MY26 specifications and check the oil level using the factory procedure. |
| Air Filter | Reusable, washable oiled foam air-filter element; optional Twin Air replacement filter |
| Service Notes | The 2026 Triumph TF 250-X is a factory-confirmed production motocross model. It retains the 249.95cc DOHC four-stroke engine, Dell'Orto electronic fuel injection, Athena ECU, five-speed gearbox and aluminium chassis. The MY26 updates include revised KYB suspension settings, optimised rear suspension linkage, new EXEDY clutch hub, redesigned battery tray, Neken triple clamps, ProTaper ACF handlebars, ODI grips and updated Triumph Performance Yellow graphics. Standard electronic features include launch control, traction control, dual engine maps and a quickshifter for second-to-fifth-gear upshifts. The manufacturer specifies 310 mm front and 305 mm rear suspension travel, 104 kg wet weight, 7-litre fuel capacity and Pirelli MX32 tyres. NGK LMAR9AI-8 with a 0.8 mm gap is carried forward from earlier TF 250-X service information and should be verified against MY26 documentation. Earlier service information specifies SAE 10W-50 engine oil and a 0.95-litre oil change capacity with filter replacement. Confirm oil grade, oil quantities, coolant specification and KYB fork service data against the 2026 factory handbook. Maintain the air filter, engine oil, oil filter, valve clearances, cooling system, drive chain and suspension linkage according to Triumph's competition maintenance schedule. |
2026 Triumph TF250-X – Race-Developed Refinements for Triumph's 250cc Motocross Contender
The 2026 Triumph TF250-X represents another stage in the British manufacturer's return to motocross competition. Introduced for 2024, the original TF 250-X marked Triumph's entry into modern four-stroke motocross machinery. The 2026 model retains the established 249.95cc engine and aluminium chassis while introducing a series of race-developed refinements intended to improve handling, clutch durability and performance on demanding tracks.
The engine remains a compact, liquid-cooled DOHC single-cylinder four-stroke with a 78 mm bore, 52.3 mm stroke and 14.4:1 compression ratio. Electronic fuel injection uses a 44 mm Dell'Orto throttle body with a Keihin injector and Athena engine management. Triumph quotes peak output of approximately 48 PS at 13,500 rpm. Standard electronic features include launch control, traction control, selectable engine maps and a quickshifter allowing clutchless upshifts between second and fifth gears.
An important mechanical development for 2026 is the revised EXEDY clutch hub, designed to provide more consistent engagement and improved durability under competition conditions. Triumph also updated the battery tray, revised the rear suspension linkage and introduced new graphics featuring Triumph Performance Yellow. Neken triple clamps, ProTaper ACF handlebars and ODI grips form part of the updated control equipment.
Suspension remains a major feature of the TF250-X. The 48 mm KYB Air-Oil Separate forks provide 310 mm of travel, while the linkage-operated KYB rear shock offers 305 mm. Revised suspension settings and linkage geometry aim to improve stability, traction and control over rough terrain. Correct rider sag and damping adjustment remain essential, and owners can consult the MXOwners rear suspension setup and adjustment guide for practical information.
For owners, routine servicing remains especially important on a competition four-stroke. Regular air-filter cleaning, engine oil changes, valve-clearance inspections and cooling-system checks help protect the high-performance engine. The MXOwners motorcycle parts finder can assist when researching compatible service and replacement components. With its revised clutch, suspension updates and extensive standard electronics, the 2026 TF250-X continues Triumph's development of a competitive 250cc motocross motorcycle without abandoning the original platform.
