Tyre size
Best 315/40 R21 tyres
Picked for the car that run 315/40 R21 from the factory, ranked by independent test results and set for the most demanding of them, so every pick suits every car here.
- width
- 315 mm
- sidewall
- 126 mm
- diameter
- 785 mm
- rim
- 21 in
Best tyres in 315/40 R21
Best overall
Bridgestone
Potenza Sport
Highest fit score for everyday driving on the cars that use this size.
Max performance summer · Premium · fit 76
Best off-road
Yokohama
Geolandar A/T G015
Highest fit score for gravel, beach and towing.
All-terrain (A/T) · Mid-range · fit 68
Best in the wet
Continental
SportContact 7
Strongest wet braking and handling in independent tests.
Max performance summer · Premium · fit 73
Best performance
Michelin
Pilot Sport 4S
Most dry grip and steering response for spirited roads.
Max performance summer · Premium · fit 79
Best value
Kumho
Ecsta PS91
The highest-scoring lower-priced tyre in the same category.
Max performance summer · Value · fit 50
Not every tyre is made in every size. “See today’s price” opens the tyre in 315/40 R21 when the retailer stocks it, or the tyre’s page when it doesn’t. Match or beat the load index and speed rating on your placard.
Cars on 315/40 R21 from the factory
| Car | Fitment | Category it needs |
|---|---|---|
| Lamborghini Urus S | 315/40 R21 rear · Standard 21in | Max performance summer |
The picks above are max performance summer tyres or better. A car that needs a gentler category can go lower: its own page shows how far.
315/40 R21 questions
What are the best 315/40 R21 tyres?
For the cars that use 315/40 R21 from the factory, ratio's top pick is the Bridgestone Potenza Sport, a max performance summer tyre. Best off-road: Yokohama Geolandar A/T G015. Best in the wet: Continental SportContact 7. Best performance: Michelin Pilot Sport 4S. Best value: Kumho Ecsta PS91.
Which cars use 315/40 R21 tyres?
Lamborghini Urus S (rear). Always check the placard on your own car: wheels and tyres get changed.
How big is a 315/40 R21 tyre?
About 785 mm (30.9 in) tall overall, 315 mm wide, with a 126 mm sidewall, on an 21-inch rim.