Tyre size
Best 255/40 R21 tyres
Picked for the car that run 255/40 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
- 255 mm
- sidewall
- 102 mm
- diameter
- 737 mm
- rim
- 21 in
- factory ratings
- 102Y
Best tyres in 255/40 R21
Best overall
Michelin
Pilot Sport 5
Highest fit score for everyday driving on the cars that use this size.
Ultra-high performance summer · Premium · fit 84
Best off-road
BFGoodrich
All-Terrain T/A KO3
Highest fit score for gravel, beach and towing.
All-terrain (A/T) · Premium · fit 66
Best in the wet
Goodyear
Eagle F1 Asymmetric 6
Strongest wet braking and handling in independent tests.
Ultra-high performance summer · Premium · fit 83
Best performance
Michelin
Pilot Sport 4S
Most dry grip and steering response for spirited roads.
Max performance summer · Premium · fit 77
Best value
Falken
Azenis FK520
The highest-scoring lower-priced tyre in the same category.
Ultra-high performance summer · Value · fit 60
Not every tyre is made in every size. “See today’s price” opens the tyre in 255/40 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 255/40 R21 from the factory
| Car | Fitment | Category it needs |
|---|---|---|
| Kia EV6 GT | 255/40 R21 102Y · GT 21in | Ultra-high performance summer |
The picks above are ultra-high performance summer tyres or better. A car that needs a gentler category can go lower: its own page shows how far.
255/40 R21 questions
What are the best 255/40 R21 tyres?
For the cars that use 255/40 R21 from the factory, ratio's top pick is the Michelin Pilot Sport 5, a ultra-high performance summer tyre. Best off-road: BFGoodrich All-Terrain T/A KO3. Best in the wet: Goodyear Eagle F1 Asymmetric 6. Best performance: Michelin Pilot Sport 4S. Best value: Falken Azenis FK520.
Which cars use 255/40 R21 tyres?
Kia EV6 GT. Always check the placard on your own car: wheels and tyres get changed.
How big is a 255/40 R21 tyre?
About 737 mm (29.0 in) tall overall, 255 mm wide, with a 102 mm sidewall, on an 21-inch rim.