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305/25 R20 Dimensions Explained

The ultra-low-profile size of 305/25 R20 tyres is typically used on high-performance vehicles. The meaning of the numbers is quite simple. The first number in the size, 305, denotes the width of the tyre in millimetres. The second number, 25, is the aspect ratio. This means the sidewall height is 25% of 305mm, which roughly calculates to about 76mm. R20 implies the tyre is radial and is fitted to a 20-inch rim. This gives the tyre an overall diameter of roughly 660mm. The short sidewall prioritises the handling of the tyre over the comfort. 305/25 R20s, including their XL variants, can be found in our inventory at Tyres.co.uk.

Part of the sizeValueWhat it means
Section width 305 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 25 Sidewall height as a percentage of the width - here, 25% of 305 mm (about 76 mm).
Construction R Radial construction, which is what nearly all road tyres use.
Rim diameter 20 The wheel diameter the tyre fits, measured in inches.
Your tyre dimensions
MeasurementValue
Sidewall height 76.2 mm (3.00 in)
Overall diameter 660 mm (26.0 in)
Circumference 2,075 mm (81.7 in)
Revolutions 776 per mile · 482 per km
Equivalent sizes
SizeOverall diameter
295/30 R19 660 mm · -0.1%
295/25 R20 656 mm · -0.8%
305/30 R19 666 mm · +0.8%
285/30 R19 654 mm · -1.0%
285/25 R20 650 mm · -1.5%
325/30 R19 678 mm · +2.6%