Aprilia SX 125 vs Suzuki DR-Z4SM 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 4.2x faster than real time.

0:00.0

Aprilia SX 125

0 km/h / 15 hp / 136 kg wet

Gap

+0.00 s

Suzuki DR-Z4SM

0 km/h / 38 hp / 154 kg wet

Speed through the lap

0 to 163 km/h, shaded zones are corners

Suzuki DR-Z4SM takes it by 18.41 s, which is 505 m of daylight at the flag. Most of it came at Spec Sheet Straight.

Aprilia SX 125

2:13.21

top 114 km/h / avg 92 km/h / 1 corners won

Suzuki DR-Z4SM

1:54.80

top 154 km/h / avg 106 km/h / 2 corners won

Sector	SX 125	DR-Z4SM
Sector 1	56.42 s	47.30 s
Sector 2	21.83 s	19.68 s
Sector 3	54.89 s	47.78 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 Suzuki DR-Z4SM laps the Ref Ring in 1:54.80 on paper, 18.41 seconds quicker than the Aprilia SX 125 at 2:13.21. That gap is worth about 505 metres at the flag, and the biggest single chunk of it, 5.55 s, comes at Spec Sheet Straight.

Through the corners it is 1 apexes to 2 between the SX 125 and the DR-Z4SM. Top speed goes 114 km/h to 154 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: Aprilia SX 125 and Suzuki DR-Z4SM.

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