KTM 125 Duke
KTM's 125cc roadster, the entry point to the Duke family. Shares the central chassis with the 390 Duke, so it punches above its weight on handling. 14.75bhp single, 6-speed, A1 license. The 2024 update added a 5-inch TFT dash, new frame, and Euro5+ ready engine — bringing the spec up to that of bikes costing significantly more. Sporty riding position and aggressive looks make it popular with CBT graduates who want a sportbike feel without the 125 sportbike posture.
- Engine
- 124 cc
- Power
- 14.75 PS
- Weight
- 159 kg
- Seat height
- 820 mm
- A2 licence
- —
Liquid-cooled DOHC 4-valve single
wet
The short version
Forecourt score
Value 50 · Insurance 84 · Theft 65
The KTM 125 Duke holds its value about as well as most bikes (around 30% lost over three years, against the 25-32% bike norm) and is cheap to insure (around £290/yr typical). Theft risk is moderate. The main thing to check on a used one is the throttle body sensor.
A bike-specific blend of value retention, insurance and theft risk (weighted 40/35/25). Bikes carry no MOT reliability data, so reliability isn't scored. Higher is better.
Variant: 125 Duke
Engine
Petrol · 124cc
Power
14.75 ps
Torque
12 Nm
Weight
159 kg
Seat
820 mm
Transmission
6-speed manual
Economy
110 mpg
2024-on 125 Duke — new frame, 5-inch TFT, Euro5+ engine. WP suspension, Bosch ABS, 17-inch wheels. Same chassis as the 390 Duke. 820mm seat tall for short riders. 13.5L tank.
Tell us about the one you're looking at
Tidy and well looked-after for its age — the typical clean bike.
Estimated market value
£3,359
Range £3,023 – £3,695
HIGH CONFIDENCE
Holding value
Bikes hold value far better than cars — typical motorcycle 3-year depreciation is 25–32%, against cars' 40–50%. Some bikes (Hayabusa, Gold Wing, classic Z1000) actually appreciate in the 7–15 year zone as cult demand outstrips supply.
New
£4,999
At 5 years
£2,999
At 10 years
£2,100
Value loss by phase
Each band shows the share of original value lost during that window — not cumulative. Appreciation (green, marked +X% gained) is real for bikes that develop cult status.
UK new price by year
How we estimate this
Phase depreciation derived from observed UK used-bike pricing — classified ads, dealer asking prices, and end-of-auction figures. Bike residuals depend heavily on theft history, service-stamp count, and crash-damage signatures. The figures here are indicative for clean, fully-stamped examples.
What it costs to own
Indicative running costs at 8,000 miles a year — the UK rider average. Chain-drive bikes carry a chain/sprocket consumable line; tax (typically £25–£100/yr) and depreciation are excluded — see the section above for value retention.
3-year total
£1,452
Per year
£484
Per mile
£0.06
Service costs assume independent specialist labour and OE parts. Tyre intervals reflect typical UK road riding — track-day usage burns through rear tyres in <2,000 miles. Fuel uses the variant MPG at £1.45/L. Lower-mileage riders see proportionally lower totals; higher-mileage commuters pay roughly linearly more.
Estimated insurance
ABI motorcycle scheme · Comprehensive · 5 yr NCB
Indicative annual comprehensive premiums for this bike. Bike insurance is far more sensitive to licence tier and rider age than cars — pick the combination closest to your circumstances.
Licence
Age
No-claims bonus
5 yearsRisk profile
Estimated annual premium · typical, age 30-39
£290/ year
Roughly £24 per month
Typical
Suburban postcode, 3+ years NCB, standard security (Thatcham chain + disc lock), no recent claims.| Age band | Lower risk | Typical | Higher risk |
|---|---|---|---|
| Age 17-21 | £479 | £638 | £893 |
| Age 22-29 | £294 | £392 | £548 |
| Age 30-39Selected | £218 | £290 | £406 |
| Age 40-49 | £191 | £255 | £357 |
| Age 50+ | £174 | £232 | £325 |
How we estimate this
Premiums combine licence tier, rider age, no-claims bonus and a risk-profile multiplier on top of a bike-specific baseline. Bike insurance is materially more sensitive to licence tier (CBT / A1 / A2 / A) than car insurance, and young riders pay considerably more than older riders even on the same machine. Always get individual quotes before buying.
Theft risk
Bike-specific · Met Police + insurance reporting
UK bike theft rates are an order of magnitude higher than car theft. Nakeds and supersports lose more to professional gangs; large adventure bikes and tourers are statistically much safer.
Theft risk score · 1 to 4
2/4Medium risk
Medium risk
Some theft pattern, particularly in urban postcodes. Thatcham-approved chain plus disc lock recommended; secure overnight parking helps premiums.Theft hotspot postcodes
Postcode prefixes only; full London hot zone runs across E, N, NW, SE, SW, W boroughs depending on the model.
What this means for you
Premium 125, popular with young riders — joyride target. KTM electronics make hot-wiring harder than older bikes; chain + disc lock essential.
How we set this band
Bands derived from Met Police bike-theft reporting (most-stolen lists) cross-referenced with insurance industry underwriting data. Model + postcode are the two biggest factors in motorcycle theft risk in the UK, materially more than vehicle value.
What goes wrong
5 known issues · sorted by severity
Documented failure modes from UK owner forums, dealer service bulletins, and aggregated mechanic feedback. Mileages are approximate — different riders see different intervals depending on use and maintenance. Always address "high"-severity items before resale.
High severity
1
Medium
1
Low / cosmetic
3
| Severity | Part / issue | Cost |
|---|---|---|
| high | Throttle body sensor Causes stall at idle if it fails — known KTM small-single issue 15k+ mi | £250 |
| medium | Chain & sprockets Aggressive gearing wears the chain faster than rivals 8-12k mi | £140 |
| low | Front brake pads 6-9k mi | £60-80 |
| low | Battery every 3 years | £70-90 |
| low | TFT dash software glitches Early 2024 bikes saw occasional dash freezes — KTM fix applied any | warranty |
How we score severity
High — strands the bike or causes consequential damage if left. Medium — service item that affects ride quality or risks failure. Low — cosmetic or minor inconvenience. Costs are independent-specialist UK rates for parts and labour together; main dealer prices typically run 30–50% higher.
Safety recalls
Manufacturers occasionally issue safety recalls to fix a fault free of charge. You can check whether the KTM 125 Duke, or your exact vehicle, has any outstanding recalls on the official DVSA service.
Check on GOV.UKOpens the Driver & Vehicle Standards Agency recall checker. Choose the make, model and year of manufacture — no registration needed.
Strengths
- +Shares chassis with 390 Duke — class-leading handling for a 125
- +WP suspension, Bosch ABS standard — proper premium spec
- +5-inch TFT dash on 2024+ bikes
- +Sporty aggressive style that scales up to the bigger Dukes
- +13.5L tank — generous for a 125
Watch-outs
- −820mm seat tall for shorter or new riders
- −KTM service costs above Honda/Yamaha equivalents
- −Throttle body sensor failures known on KTM small singles
- −Aggressive riding position less comfortable on long commutes