Metric Size 245/40R20 in Sidewall — Car Tyres Tyres
Metric 245/40R20 =
Sidewall 3.9"
A 245/40R20 tyre has a sidewall (inches) of 3.9". This is a standard measurement used to compare tyre dimensions across different sizing systems.
When replacing tyres, always check your vehicle's manual or door placard for the recommended tyre size. Changing dimensions can affect speedometer accuracy, handling, and fuel economy.
Quick Converter
Metric 245/40R20 =
Sidewall 3.9"
Full Metric to Sidewall Car Tyres Tyres Size Chart
| Metric | Sidewall |
|---|---|
| 155/65R14 | 4.0" |
| 165/65R14 | 4.2" |
| 175/65R14 | 4.5" |
| 185/65R14 | 4.7" |
| 175/65R15 | 4.5" |
| 185/65R15 | 4.7" |
| 195/65R15 | 5.0" |
| 205/65R15 | 5.3" |
| 185/55R15 | 4.0" |
| 195/55R15 | 4.2" |
| 185/60R15 | 4.4" |
| 195/60R15 | 4.6" |
| 205/55R16 | 4.4" |
| 215/55R16 | 4.7" |
| 225/55R16 | 4.9" |
| 205/60R16 | 4.8" |
| 215/60R16 | 5.1" |
| 225/60R16 | 5.3" |
| 215/45R17 | 3.8" |
| 225/45R17 | 4.0" |
| 235/45R17 | 4.2" |
| 245/45R17 | 4.3" |
| 215/50R17 | 4.2" |
| 225/50R17 | 4.4" |
| 215/55R17 | 4.7" |
| 225/55R17 | 4.9" |
| 235/55R17 | 5.1" |
| 225/40R18 | 3.5" |
| 235/40R18 | 3.7" |
| 245/40R18 | 3.9" |
| 255/40R18 | 4.0" |
| 225/45R18 | 4.0" |
| 235/45R18 | 4.2" |
| 245/45R18 | 4.3" |
| 235/50R18 | 4.6" |
| 235/55R18 | 5.1" |
| 235/35R19 | 3.2" |
| 245/35R19 | 3.4" |
| 255/35R19 | 3.5" |
| 245/40R19 | 3.9" |
| 255/40R19 | 4.0" |
| 245/45R19 | 4.3" |
| 255/45R19 | 4.5" |
| 245/35R20 | 3.4" |
| 255/35R20 | 3.5" |
| 275/35R20 | 3.8" |
| 245/40R20 | 3.9" |
| 255/40R20 | 4.0" |
| 275/40R20 | 4.3" |
| 255/45R20 | 4.5" |
Frequently Asked Questions
- What does the tyre size 245/40R20 mean?
- The metric size 245/40R20 has a sidewall of 3.9". The numbers represent width (mm), aspect ratio (%), and rim diameter (inches).
- Can I use a different tyre size than recommended?
- You should stick to sizes recommended by your vehicle manufacturer. Different sizes can affect handling, speedometer accuracy, and safety. Consult a tyre specialist before changing sizes.
- What if Metric size 245/40R20 is too small — what's the next size up in Sidewall?
- The next size up from Metric 245/40R20 is Metric 255/40R20, which converts to Sidewall 4.0".