315/40R21 vs 325/35R22

325/35R22 is 1.0 mm taller than 315/40R21 in overall diameter (+0.1%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 325/35R22 fitted, the speedometer reads 100 km/h when you are doing 100.1 km/h.

Dimensions side by side

	315/40R21	325/35R22
Overall diameter	785 mm (30.9″)	786 mm (30.9″)
Section width	315 mm	325 mm
Sidewall height	126 mm	114 mm
Rim	21″	22″
Revolutions per km	405	405
In stock	19 tires from $319.00	5 tires from $667.00

What changes

Overall diameter: 325/35R22 is 1.0 mm taller (+0.1%).
Speedometer: reads 100 km/h at an actual 100.1 km/h with 325/35R22.
325/35R22 is 10 mm wider, so check clearance and the recommended rim width.
Wheel size changes from 21″ to 22″: you need wheels in the new size.
Choose a load index at least as high as the one on your door placard.

Vehicles that came with both sizes

Vehicles that use 315/40R21

Vehicles that use 325/35R22

See every alternate size for 315/40R21

Frequently asked questions

Can I use 325/35R22 instead of 315/40R21?

Usually, yes: 325/35R22 is within 3% of the overall diameter of 315/40R21 (+0.1%). Use wheels of the right size and width, match or exceed the original load index, and check clearance at full steering lock.

How much does the speedometer change between 315/40R21 and 325/35R22?

With 325/35R22 instead of 315/40R21, the speedometer shows 100 km/h when you are actually doing 100.1 km/h.

Which vehicles came with both 315/40R21 and 325/35R22?

Both sizes were original equipment, on different trims or packages, on the 2017–2024 Mercedes-Benz GLE 63 S, 2019–2024 Lamborghini Urus, 2020–2024 Mercedes-Benz GLE 53, 2020–2024 Mercedes-Benz GLE450, 2021–2024 Mercedes-Benz GLE53, 2020–2024 Mercedes-Benz GLE580.