Buy 165/40 R17 Tyres

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165/40 R17 Size Breakdown

165/40 R17 isn't a particularly common original equipment size, as it's more typical for modified small cars. It is also fairly simple to break down. 165 is the width of the tyre in mm. 40 is the percentage of the width in mm of the sidewall, giving a sidewall height of 66mm. R17 indicates a radial tyre; the tyre is mounted on a 17-inch diameter rim, giving an overall diameter of 564mm. The low sidewall suits a low-profile setup, but it leaves little cushioning on rough roads. Tyres of this size are held at Tyres.co.uk.

Part of the sizeValueWhat it means
Section width 165 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 165 mm (about 66 mm).
Construction R Radial construction, which is what nearly all road tyres use.
Rim diameter 17 The wheel diameter the tyre fits, measured in inches.
Your tyre dimensions
MeasurementValue
Sidewall height 66.0 mm (2.60 in)
Overall diameter 564 mm (22.2 in)
Circumference 1,771 mm (69.7 in)
Revolutions 909 per mile · 565 per km
Equivalent sizes
SizeOverall diameter
165/50 R16 571 mm · +1.3%
165/45 R16 555 mm · -1.6%
165/35 R18 573 mm · +1.6%
165/35 R17 547 mm · -2.9%