305/55r20 vs 275/65r18 Tire Size Comparison


Tire Size Comparison Visualizer
Tire 1 Side View
Tire 1 Wheel
2649
20"
168
378 Revs/km
Tire 2 Side View
Tire 2 Wheel
2558
18"
179
391 Revs/km
Tire 1 Front View
305
844
Tire 2 Front View
275
815
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Speedometer Error
(Set Size1 to OEM Size)

Speed 10 km/h30 km/h50 km/h70 km/h90 km/h110 km/h130 km/h150 km/h
Actual 9.729.148.567.987.3106.7126.1145.5
Speed Diff-0.3-0.9-1.5-2.1-2.7-3.3-3.9-4.5

Ground Clearance Decreased by 14.5

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See how the 305/55r20 tire size compares to the 275/65r18

Making a decision before buying the right tire size? Or maybe you want new aftermarket tires?

The comparison charts above represent detailed calculations of the difference in size between 305/55r20 and 275/65r18 tires.

The resulting calculations of tire diameter and width, sidewall height, circumference and rim diameter are provided in the form of comparison table and visual graphics to better convey the difference between 305/55r20 and 275/65r18 tire sizes.

On top of that, given the fact that 305/55r20 is the original equipment tire size, you may also emulate the difference between your actual speed and speedometer readings after installing the 275/65r18 tires. Chances are high that you will want to calibrate your speedometer!

Other sizes often compared:

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