MotoSpecs

2026 Honda ST125 Dax Specifications

Classic • Specs last verified 13 July 2026

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2026 Honda ST125 Dax Overview

Honda ST125 Dax is a classic motorcycle, displacing 124 cc. Power comes from a Four stroke, single cylinder, SOHC, 2 valve engine, a compression ratio of 10.0:1. On the performance side, it delivers 9.2 hp @ 7000 rpm of peak power and 10.8 Nm @ 5000 rpm of torque. On the road, the 2026 ST125 Dax tips the scales at 107 kg, carries a 3.8-litre fuel tank, offers a seat height of 775 mm and spans a 1020 mm wheelbase. That's roughly 89 kg lighter than the average classic motorcycle in our database. The full 2026 Honda ST125 Dax spec sheet below covers every technical detail, from suspension travel to tyre sizes.

2026 Honda ST125 Dax compared with other bikes in the Classic category

We checked the recorded figures for the 2026 Honda ST125 Dax against up to 909 bikes in the Classic category in our database, counting each model once at the model year nearest to this one.

  • Only 19 of the other 465 bikes in the Classic category have a lighter wet weight than the 107 kg of the ST125 Dax.
  • With 65 W/kg, the ST125 Dax has the joint 19th lowest power-to-weight ratio of 218 bikes in the Classic category, 60% below the category average of 160 W/kg.
  • Engine displacement of 124 cc is smaller than that of 800 of the other 908 bikes in the Classic category.
  • Narrowing the field to the 54 models within five model years of it, the wet weight of 107 kg is lighter than that of 50 of the other 53.

Versus the 2022 model

The figures we track are unchanged from the 2022 model: peak power, peak torque, wet weight, displacement and seat height all match.

2026 ST125 Dax - Pros & Cons

Strengths

  • Strong power output: With 9.2 hp @ 7000 rpm and 10.8 Nm @ 5000 rpm of torque on tap, the ST125 Dax is no slouch for its class.
  • Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.
  • Strong front braking: Stopping power up front is strong thanks to the disc setup, with plenty of room to upgrade further with braided lines.
  • ABS fitted: ABS comes fitted from the factory - one less thing to worry about in a sudden stop on a slippery surface.

Considerations

  • Modest fuel capacity: Range between stops is limited by the 3.8-litre tank - plan fuel stops accordingly on longer routes.
  • Chain final drive upkeep: Budget time for routine chain maintenance - it's cheap to replace but needs consistent attention to avoid premature sprocket wear.

Wear Points & Servicing Notes

Heat management in traffic

Because the ST125 Dax relies on airflow rather than a coolant jacket, expect noticeably more radiant heat at low speed and in traffic. It's inherent to air cooling, and ventilated gear largely offsets it.

Fuelling & injector care

The PGM-FI electronic fuel injection on the ST125 Dax needs little beyond good fuel and periodic use of an injector-cleaner additive - no jetting or float-bowl maintenance to worry about.

Brake disc and pad wear

Braking up front comes from single 220 mm hydraulic disc with IMU-based ABS - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.

Suspension condition on used examples

The ST125 Dax's suspension runs 31mm USD telescopic forks at the front. The rear uses Dual shocks. Fork-seal condition and rear linkage play are the two things worth checking before buying used.

Final drive maintenance

The ST125 Dax uses chain final drive, which is cheap to replace but needs regular cleaning, lubrication and tension checks to get a full service life out of the sprockets.

Frame & chassis check

Built around a Press backbone frame, the ST125 Dax's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.

Low-speed handling

107 kg keeps the ST125 Dax easy to move around in tight spaces, car parks and on the stand alike.

ST125 Dax - Buying & Maintenance Guide

What to check before buying

Before handing over money for a used 2026 Honda ST125 Dax with its 124 cc classic, cover the fundamentals: service book and oil change history, drivetrain wear, and any sign of oil weeping around the casings. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Cold-starting it yourself tells you a lot - a healthy ST125 Dax should catch quickly and settle into a smooth idle.

Oil and filter changes

Nothing protects the ST125 Dax's 124 cc four stroke, single cylinder, sohc, 2 valve like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). With a 10.0:1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Match the viscosity grade to what the owner's manual specifies, not what's cheapest.

Fuel system care

Fuel injection on the ST125 Dax needs little attention beyond decent fuel and an occasional system-cleaner additive. Anything left standing for three months or more should have its fuel drained and replaced before it varnishes the injectors.

2026 Honda ST125 Dax - Frequently Asked Questions

What engine does the 2026 Honda ST125 Dax have?
The 2026 Honda ST125 Dax uses a Four stroke, single cylinder, SOHC, 2 valve engine with 124 cc of displacement. It is air-cooled.
How much does the 2026 Honda ST125 Dax weigh?
The 2026 Honda ST125 Dax weighs 107 kg. This is the manufacturer's wet figure.
How much power does the 2026 Honda ST125 Dax make?
The 2026 Honda ST125 Dax produces 9.2 hp @ 7000 rpm of power and 10.8 Nm @ 5000 rpm of torque. These are peak figures.
What is the fuel tank capacity of the 2026 Honda ST125 Dax?
The 2026 Honda ST125 Dax has a 3.8-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 63-75 km between stops.
Is the 2026 Honda ST125 Dax suitable for shorter riders?
The 2026 Honda ST125 Dax has a seat height of 775 mm. This is a moderate seat height that suits a wide range of rider heights.
What brakes does the 2026 Honda ST125 Dax have?
The 2026 Honda ST125 Dax uses single 220 mm hydraulic disc with IMU-based ABS at the front and single 190 mm hydraulic disc at the rear.
What tyre sizes does the 2026 Honda ST125 Dax use?
The 2026 Honda ST125 Dax runs 120/70-12M/C 51L front and 130/70-12M/C 56L rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2026 Honda ST125 Dax have?
The 2026 Honda ST125 Dax is fitted with a 4 Speed rotary transmission.

Key Specifications

Engine

Four stroke, single cylinder, SOHC, 2 valve

Power

9.2 hp / 6.9 kW @ 7000 rpm

Torque

10.8 Nm / 7.9 lb-ft @ 5000 rpm

Top Speed

Not recorded

Weight

107 kg / 235.8 lbs

Fuel Capacity

3.8 Litres / 1.0 US gal

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Full 2026 Honda ST125 Dax Specifications

Year 2026
Make Model Honda ST125 Dax
Seat Height 775 mm / 30.5 in
Wheelbase 1020 mm / 40.1 in
Ground Clearance 180 mm / 7.0 in
Height 1020 mm / 40.1 in
Length 1760 mm / 69.2 in
Width 760 mm / 29.9 in
Fuel Capacity 3.8 Litres / 1.0 US gal
Wet Weight 107 kg / 235.8 lbs
Max Power 9.2 hp / 6.9 kW @ 7000 rpm
Max Torque 10.8 Nm / 7.9 lb-ft @ 5000 rpm
Displacement 124 cc / 7.62 cu-in
Engine Detail Four stroke, single cylinder, SOHC, 2 valve
Bore x Stroke 50.0 x 63.1
Compression Ratio 10.0:1
Cooling System Air-cooled
Emissions Euro 5
Fuel Induction PGM-FI electronic fuel injection
Ignition Electronic CDI
Starter Electric
Clutch Wet Multiplate and automatic centrifugal clutch
Final Drive Chain
Transmission / Drive 4 Speed rotary
Frame Type Press backbone frame
Suspension - Front 31mm USD telescopic forks
Suspension - Rear Dual shocks
Rake 24.9°
Trail 84 mm / 3.3 in
Wheel Travel - Front 100 mm / 3.9 in
Wheel Travel - Rear 120 mm / 4.7 in
Brakes - Front Single 220 mm hydraulic disc with IMU-based ABS
Brakes - Rear Single 190 mm hydraulic disc
ABS Single channel ABS
Tyres - Front 120/70-12M/C 51L
Tyres - Rear 130/70-12M/C 56L
Wheels 5 Spoke cast aluminium

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.

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