Every scooter’s sidewall carries a code like 80/90-16 that quietly shapes how it rides. Using tyre sizes the manufacturers publish for Vietnamese-market scooters (retrieved 23 September 2026), here is how to read them.
Reading the code
Take the Honda Vision’s front tyre: 80/90-16.
- 80 - section width: 80 mm nominal.
- 90 - aspect ratio: the sidewall is 90% of the width (72 mm).
- 16 - wheel diameter in inches.
- Suffixes (43P etc.) are load index and speed rating; M/C marks a motorcycle tyre.
Verified sizes across popular models
| Model | Front | Rear |
|---|---|---|
| Honda Vision | 80/90-16 | 90/90-14 |
| Honda Air Blade 160 | 90/80-14 | 100/80-14 |
| Yamaha Janus 125 | 80/80-14 (tubeless) | 100/70-14 (tubeless) |
| Honda Lead 125 | 90/90-12 | 100/90-10 |
| Yamaha FreeGo 125 | 100/90-12 (tubeless) | 110/90-12 (tubeless) |
| Yamaha Grande | 110/70-12 | 110/70-12 |
What size changes
- Diameter (the last number): bigger wheels = more stability and defect-spanning ability, less agility at walking pace - the Vision’s 16-inch front vs the Grande’s 12-inch set shows the two philosophies (see our 16-inch wheel guide).
- Width: wider tyres grip more on clean pavement but tramline over grooves and add a little drag; the Grande’s 110-section front is the widest of this group.
- Aspect ratio: taller sidewalls (90) cushion bad surfaces; low profiles (70) sharpen steering response.
Practical notes
Always replace with the size the manufacturer specifies - our replacement tyre guide covers choosing brands and our tubeless vs inner tube explainer the puncture behaviour. Check age codes before accepting any bike (our tyre age guide), and for renters: a quick tyre look is part of the pre-rental inspection. Contact us to confirm current availability of any specific model.