2011–2012 · Naked Bike · Buyer's Guide
Real Bike, Learner License
The 2011–2012 KTM 125 Duke is the rare small bike that doesn't feel like something you're supposed to outgrow in a season. It has a steel trellis frame, an upside-down WP fork and Bybre brakes. That is hardware you would normally expect a class or two higher, and the sharp orange styling has the same attitude as the bigger Dukes. The liquid-cooled 125 cc single makes 15 hp at 10,500 rpm and 9 lb-ft at 8,000 rpm. Those are modest numbers. In a 282 lb (128 kg) package they're enough to let the chassis do the talking, and the chassis is the whole story here.
It rides like a proper KTM in miniature. It's light and direct, easy to place, and cheap to run day to day. A new rider gets a machine that builds good habits in traffic and on a tight back road, and a more experienced rider gets a reminder of how much fun momentum can be. There are two honest caveats. A 78 mph (125 km/h) top speed rules out serious freeway duty. Ownership isn't carefree either: seized gear selectors, erratic fueling, dash faults, coolant and oil leaks, and chains and sprockets worn out by 2,500 miles are all documented. Buy one with a clean dealer history.
Spec sheets don't ride bikes, but they set the baseline.
| Power | 15 hp (11 kW) @ 10,500 rpm |
|---|---|
| Torque | 9 lb-ft (12 Nm) @ 8,000 rpm |
| Displacement | 125 cc |
| Engine | Single-cylinder |
| Cooling | Liquid-cooled |
| Gearbox | 6-speed |
| Final drive | Chain |
| Fork | Upside-down (USD) |
| Front tire | 110/70-17 |
| Rear tire | 150/60-17 |
| Seat height | 31.9 in (810 mm) |
| Wet weight | 282 lb (128 kg) |
| Fuel capacity | 2.9 gal (11 L) |
| Top speed | 78 mph (125 km/h) |
Equipment check
Chassis
The first thing you notice when you swing a leg over is how little bike there is under you. The 31.9 in (810 mm) seat is tall enough to feel like a real motorcycle. At 282 lb (128 kg), though, it never leans on you at a stoplight, and you can paddle it backward out of a parking space without thinking about it. You sit close to the bars with nothing between your chest and the air, and that exposure is the point. Keeping the little single in its happy zone means your left foot stays busy on the six-speed box, so even a grocery run starts to feel like rhythm practice. At a steady 55 mph on a two-lane, the wind pushes on your shoulders and your body swears you're going far faster than the speedo shows. You ride this bike with your whole body, not just your right wrist.
Seized gear selector
The gear selector may seize, making gear changes difficult or impossible; requires dealer intervention.
Engine spluttering and mapping issues
Engine may splutter or run erratically, possibly due to ECU mapping faults; can cause poor performance.
Dashboard and speedometer malfunction
Dashboard may flicker, mist up, or display incorrect service reminders; speedometer can also fail intermittently.
Brake light switch failure
The front brake light switch fails, often due to cold weather; removing the rubber cap can temporarily fix it.
Premature chain and sprocket wear
Chain and sprockets may require replacement as early as 2500 miles due to stiff links, not covered under warranty.
Coolant leak
Coolant can leak from a faulty radiator cap or hose connections.
Oil leaks
Recurrent oil leaks from unspecified engine seals or gaskets; reported on low mileage bikes.
Where this KTM 125 Duke pulls ahead of — or falls behind — its rivals on the numbers, and the typical bike in its class on character.
Power
Torque
Displacement
Wet weight
Top speed
Seat height
Forget spec-sheet bragging. Here's who the 125 Duke is actually built for.
It's great for San Francisco streets and fun on Skyline at a sane pace. Just know that 78 mph tops out well short of relaxed freeway speeds, so keep your commute on surface roads.
Made for Bay Area Ridge Roads · San Francisco / Bay Area · Skyline Boulevard / Alice's Restaurant
If you want to sharpen your technique over raw speed, this light, clear-talking chassis is a great tutor. The long highway ride out to the Dragon is where it will wear on you.
Made for Back of the Dragon · Blue Ridge Parkway · Cherohala Skyway
It carves beautifully and teaches momentum, but on long Angeles Crest climbs 15 hp will leave an experienced rider wanting more. Buy it as a skills tool, not your main canyon bike.
Made for Angeles Crest Highway · Coronado Trail / US 191 · Highway 1 / Big Sur
If this one isn't quite the fit, these are the bikes worth riding back-to-back against it.
Successor · 2013–2016
Big-Bike Soul, 125 Plates
Successor · 2017–2024
Big Attitude, Tiny Engine
Competitor · 2014–2019
Big-Bike Style, Learner Weight
Competitor · 2011–2016
Lightweight City Learner Done Right
Competitor · 2008–2014
Full-Size Soul, Learner Limits