Question 1

What is the diameter of a 235/45 R20 tire?

Accepted Answer

A 235/45 R20 tire has a nominal overall diameter of 720 mm (28.3 inches), a sidewall height of 106 mm and a rolling circumference of 2260 mm. These are nominal figures calculated from the size marking; actual dimensions vary by manufacturer, load and wear.

Question 2

What do the numbers in 235/45 R20 mean?

Accepted Answer

235 is the nominal section width in millimetres. 45 is the sidewall height expressed as a percentage of that width, giving a 106 mm sidewall. R denotes radial construction, and 20 is the wheel bead-seat diameter in inches — which is not the overall tire diameter.

Question 3

Which vehicles use 235/45 R20 tires?

Accepted Answer

The catalogue records this size on 32 vehicle configurations, including 2017 GMC Terrain 2.4 Petrol Automatic 6-speed AWD, 2017 GMC Terrain 2.4 Petrol Automatic 6-speed FWD, 2017 GMC Terrain 3.6 Petrol Automatic 6-speed AWD, 2017 GMC Terrain 3.6 Petrol Automatic 6-speed FWD, 2016 GMC Terrain 2.4 Petrol Automatic 6-speed AWD. Always confirm the size against the vehicle placard before fitting.

Nominal section width	235 mm
Sidewall-to-width ratio	45%
Sidewall height	106 mm
Construction	R — radial
Wheel bead-seat diameter	20 inches
Overall diameter	720 mm (28.3 in)
Rolling circumference	2260 mm

235/45 R20 tire dimensions

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What 235/45 R20 means

Vehicles with 235/45 R20 tires