Aprilia SX 125 vs KTM 390 SMC R

Verdict

The KTM 390 SMC R wins this comparison comfortably, 68.3 points to 44.2.

The gap of 24.1 points is built mostly in engine and performance, where the 390 SMC R takes 7.6 points out of the SX 125. Scores are computed within each bike's class from published spec data; the full formula is on the methodology page.

On the road the 390 SMC R is the quicker machine: 45 hp and 39 Nm moving 161 kg, against 15 hp and 11.5 Nm moving 136 kg for the SX 125. That is 0.28 hp per kilo playing 0.11.

The SX 125 costs €4,199, which leaves €2,800 in your pocket against the 390 SMC R at €6,999. Service intervals run 6,000 km on the SX 125 and 10,000 km on the 390 SMC R.

Frequently asked

Which is faster, the Aprilia SX 125 or the KTM 390 SMC R?

The KTM 390 SMC R. It carries 0.28 hp per kilo (45 hp, 161 kg wet) against 0.11 hp per kilo for the Aprilia SX 125 (15 hp, 136 kg).

Is the Aprilia SX 125 cheaper than the KTM 390 SMC R?

The Aprilia SX 125 is cheaper at €4,199 list, €2,800 less than the KTM 390 SMC R at €6,999.

Which is better for shorter riders?

The KTM 390 SMC R. Its 860 mm seat is 20 mm lower than the Aprilia SX 125, and at 161 kg it is the easier bike to manage at a stop.

Which has better technology, the SX 125 or the 390 SMC R?

The KTM 390 SMC R, which scores 8.3 of 10 tech points with cornering ABS, a TFT dash, traction control and phone connectivity. The Aprilia SX 125 counters with a deliberately simple spec.

Which goes further on a tank?

The Aprilia SX 125: 269 km from its 7 litre tank at the claimed consumption, against 250 km for the KTM 390 SMC R.

Which bike wins overall?

The KTM 390 SMC R, scoring 68.3 of 100 against 44.2 on our within-class points system. The full breakdown and formula are public on the methodology page.