Smart forfour (2004–2006) nudio se s 14 različitih konfiguracija motora kroz cijelu ponudu opreme.
| Motor | Snaga | Okretni moment | Mjenjač | Pogon | Najveća brzina | 0-100 km/h | Potrošnja | Dostupno u |
|---|---|---|---|---|---|---|---|---|
| 1.5L Benzin | 177 hp | 230 Nm | Manual | Front Wheel Drive | 221 km/h | 6.9 s | 6.8 l/100km | 1 verziji |
| 1.5L Benzin | 122 hp | 160 Nm | Automatic | Front Wheel Drive | 195 km/h | 9.5 s | 6.4 l/100km | 1 verziji |
| 1.5L Benzin | 122 hp | 160 Nm | Manual | Front Wheel Drive | 195 km/h | 9.5 s | 6.3 l/100km | 1 verziji |
| 1.5L Benzin | 109 hp | 145 Nm | Automatic | Front Wheel Drive | 190 km/h | 9.8 s | 5.8 l/100km | 2 verzije |
| 1.5L Benzin | 109 hp | 145 Nm | Manual | Front Wheel Drive | 190 km/h | 9.8 s | 6.1 l/100km | 2 verzije |
| 1.5L Dizel | 95 hp | 210 Nm | Automatic | Front Wheel Drive | 180 km/h | 10.5 s | 4.6 l/100km | 3 verzije |
| 1.5L Dizel | 95 hp | 210 Nm | Manual | Front Wheel Drive | 180 km/h | 10.5 s | 4.6 l/100km | 3 verzije |
| 1.3L Benzin | 95 hp | 125 Nm | Automatic | Front Wheel Drive | 180 km/h | 10.8 s | 5.6 l/100km | 3 verzije |
| 1.3L Benzin | 95 hp | 125 Nm | Manual | Front Wheel Drive | 180 km/h | 10.8 s | 5.8 l/100km | 3 verzije |
| 1.1L Benzin | 75 hp | 100 Nm | Automatic | Front Wheel Drive | 165 km/h | 13.4 s | 5.3 l/100km | 3 verzije |
| 1.1L Benzin | 75 hp | 100 Nm | Manual | Front Wheel Drive | 165 km/h | 13.4 s | 5.5 l/100km | 4 verzije |
| 1.5L Dizel | 68 hp | 160 Nm | Automatic | Front Wheel Drive | 160 km/h | 13.9 s | 4.6 l/100km | 3 verzije |
| 1.5L Dizel | 68 hp | 160 Nm | Manual | Front Wheel Drive | 160 km/h | 13.9 s | 4.6 l/100km | 4 verzije |
| 1.1L Benzin | 64 hp | 92 Nm | Manual | Front Wheel Drive | 158 km/h | 15.3 s | 5.4 l/100km | 2 verzije |
Svaki je red zasebna mehanička konfiguracija — obujam motora, snaga, mjenjač, pogon i vrsta goriva — deduplicirana kroz razine opreme koje dijele isti motor. Razlike samo u opremi (unutrašnjost, naplatci, opcije) ne stvaraju zaseban red.