Two Yamaha underbones, the same no-clutch-lever formula, completely different riders. The Sirius RC is Yamaha’s classic Vietnamese commuter; the PG-1 is its adventure-flavoured sibling. Verified Yamaha VN figures below (retrieved 23-24 September 2026).
Engines
The PG-1’s 113.7 cc air-cooled single makes 6.6 kW at 7,000 rpm and 9.5 Nm at 5,500 rpm; the Sirius RC’s 110.3 cc single makes 5.9 kW at 8,000 rpm and 9.0 Nm at 5,000 rpm. Both use a four-speed gearbox with an automatic centrifugal wet clutch — foot shifting only, no stalling, no clutch practice.
Where they differ
| Yamaha PG-1 | Yamaha Sirius RC | |
|---|---|---|
| Seat height | 795 mm | not published on retrieved page |
| Weight | 107 kg (listed) | 100 kg wet |
| Fuel tank | 5.1 L | 4.2 L |
| Claimed economy | 1.76 L/100 km (spec table) | 2.08 L/100 km |
| Tyres | 90/100-16 block pattern, tubed | 70/90-17 front, 80/90-17 rear, tubed |
| Ground clearance | 190 mm | not published |
| List price | not displayed on retrieved page | 21,993,000 VND (RC version) |
The Sirius is lighter, cheaper to buy and cheaper to run in the city; the PG-1 carries more fuel, rides taller, and its block-pattern 16-inch tyres and 190 mm clearance are built for rough or flooded roads.
Which one
For pure Hanoi commuting, the Sirius RC remains the rational choice — lighter, proven, inexpensive, and the class our commuting underbones guide recommends. The PG-1 is for riders whose week includes unpaved lanes, dyke roads, or wet-season streets that become shallow rivers. Within the Sirius family itself there is also the FI-versus-RC decision — our Sirius comparison covers it. For rental availability of any model: contact us to confirm current availability.