TireSize tire comparison
Compare two tires side by side.
Enter your current tire and the size you want to test. TireSize shows diameter, circumference, RPM, and speedometer change instantly.
Tire 1
Tire 2
Results
Enter both tire sizes, then press Calculate to populate the comparison.
265/70R17 vs 245/65R17
Run the calculator to see detailed measurements for each tire and how far the new setup deviates from stock.
- • Compare overall diameter and sidewall height (shows clearance impact).
- • Track RPM and speedometer variance.
- • Copy your comparison link to share in build threads.
Why compare with TireSize
Plan every tire swap with confidence
Plus sizing
See how taller tires change clearance and speedometer readings.
Winter swaps
Compare OEM summers vs. skinny winter sets to keep AWD happy.
Off-road setups
Validate 33" vs 35" upgrades before regearing.
265/70R17 vs 245/65R17
Use the comparison above to see exact numbers; here are guidelines for deciding between these two sizes:
Analysis Verdict
The 245/65R17 is a 6.5% smaller tire compared to your original setup. It is 20mm narrower.
Critical Warnings
- Diameter difference is 6.5%, which is significant. Brake failure or rubbing is possible.
Speedometer Accuracy
Since the new tire is smaller, your speedometer will read faster than your actual speed. When it shows 60 mph, your true speed is roughly 56.1 mph.
Clearance & Fitment
Clearance should not be an issue for this setup.
Disclaimer
The calculations and recommendations on this site are for informational purposes only. Always consult your vehicle manufacturer, tire professional, and local regulations before making any changes to tire or wheel size.