Buy 255/40 R23 Tyres

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255/40 R23 Size Breakdown

The large 255/40 R23 size is typically found as the standard size on high performance luxury SUVs with large 23-inch wheels that fill large wheel arches. The meaning is quite simple. 255 is the width of the tyre in millimetres. 40 is the sidewall height as the ratio of 255, meaning the sidewall height is 40% of 255 millimetres, or 102 millimetres. R23 means it is a radial tyre that is built on a 23-inch rim. This gives the tyre a total diameter of 788 millimetres. We sell the tyre size 255/40 R23, including its XL versions, at Tyres.co.uk.

Part of the sizeValueWhat it means
Section width 255 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 40 Sidewall height as a percentage of the width - here, 40% of 255 mm (about 102 mm).
Construction R Radial construction, which is what nearly all road tyres use.
Rim diameter 23 The wheel diameter the tyre fits, measured in inches.
Your tyre dimensions
MeasurementValue
Sidewall height 102.0 mm (4.02 in)
Overall diameter 788 mm (31.0 in)
Circumference 2,476 mm (97.5 in)
Revolutions 650 per mile · 404 per km
Equivalent sizes
SizeOverall diameter
255/45 R22 788 mm · +0.0%
265/45 R22 797 mm · +1.2%
275/40 R22 779 mm · -1.2%
275/35 R23 777 mm · -1.5%
275/40 R23 804 mm · +2.0%
265/40 R22 771 mm · -2.2%