Fantic XMF 125 Performance vs KTM 390 SMC R on track

One standing-start lap of the Ref Ring, our 3.4 km circuit with no home-crowd corners. Every braking point, apex speed and straight is computed from the published specs, so the stopwatch has no favourites.

Read the full comparison

One lap of the Ref Ring

3.4 km, nine corners. Simulated from published specs, played back 4.1x faster than real time.

0:00.0

Fantic XMF 125 Performance

0 km/h / 15 hp / 127 kg wet

Gap

+0.00 s

KTM 390 SMC R

0 km/h / 45 hp / 161 kg wet

Speed through the lap

0 to 172 km/h, shaded zones are corners

KTM 390 SMC R takes it by 20.25 s, which is 560 m of daylight at the flag. Most of it came at Spec Sheet Straight.

Fantic XMF 125 Performance

2:12.28

top 114 km/h / avg 92 km/h / 7 corners won

KTM 390 SMC R

1:52.02

top 163 km/h / avg 109 km/h / 2 corners won

Sector	XMF 125 Performance	390 SMC R
Sector 1	55.95 s	46.05 s
Sector 2	21.69 s	19.32 s
Sector 3	54.57 s	46.61 s

The working: every assumption in the simulation

This is a point-mass lap simulation from published specs, the same quasi-static method club-level lap-time tools use. It is an estimate for comparison, never a measured lap.

Rider: 75 kg, added to each bike's wet weight.
Drivetrain efficiency: 90 percent of claimed peak power.
Aero drag area by class, 0.32 (faired supersport) to 0.44 (adventure and enduro); air density 1.2 kg/m3, rolling resistance 0.015.
Peak cornering grip by class, 0.88 g (enduro knobbies) to 1.15 g (supersport rubber), adjusted mildly for load: lighter bikes work their tyres less.
Braking from the front brake spec: disc size and caliper type set the ceiling, grip has the final say.
Launch capped by the wheelie limit computed from wheelbase and seat height, and by tyre grip through the friction circle in every corner.

Race notes

The KTM 390 SMC R laps the Ref Ring in 1:52.02 on paper, 20.25 seconds quicker than the Fantic XMF 125 Performance at 2:12.28. That gap is worth about 560 metres at the flag, and the biggest single chunk of it, 6.10 s, comes at Spec Sheet Straight.

Through the corners it is 7 apexes to 2 between the XMF 125 Performance and the 390 SMC R. Top speed goes 114 km/h to 163 km/h. A faster lap is not the same thing as the better buy, which is why the full comparison scores value, practicality and ownership too.

Simulated lap times from published specs with stated assumptions, not measured track data. The circuit is fictional and the physics are listed under the race. Read about both bikes: Fantic XMF 125 Performance and KTM 390 SMC R.

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