18 shops · 56 ·847+ products
THETIRELAB.COM

315/40 R21 - Best allround tyres 2026 - market overview, tests, reviews

All Season
1
Tyres

Best deals

Best tyres in tests (2026)

Default order: highest overall test rating first. Ratings combine tests in different tyre sizes.

Filter
1
Michelin CrossClimate 3 Sport
MichelinPremium
CrossClimate 3 Sport
TYREREVIEWS'26#1AUTOVIEW'26#1TYREREVIEWS'26#2
8.3
Price from£434
Expert summary
The Michelin CrossClimate 3 Sport is an all-season tyre designed to bridge sport and winter capabilities. Developed by the French manufacturer Michelin as the successor to the CrossClimate line, this tyre has received the French Ze Award for Technological Innovation. It is also utilized as original equipment on the Alpine A390.
Performance
Rolling resistance
100%
Dry handling
91%
Dry braking
88%
+16
Mileage
29%
Fuel efficiency
21%
Price/value
0%
View full review
Price variants (1)
315/40 R21 115 Y
A B 75dB
£434
mytyres.co.uk
mytyres.co.uk
£434
In stock · Free shipping
Buy

315/40 R21 tyre test

Personalize →

Best tyres in your size

Dry

1. Michelin CrossClimate 3 Sport
89%

Wet

1. Michelin CrossClimate 3 Sport
71%

Snow

1. Michelin CrossClimate 3 Sport
77%

This is a preview of our comprehensive tyre test. The full test includes:

Detailed breakdowns
Interactive sorting
Side-by-side comparisons
View Full Test Results

Price vs Quality

See how tyre price relates to test performance at a glance

I'm looking for ...

Best snow tyres
Best tyres for EVs
Best dry-handling tyres
Best rain tyres
Best handling tyres
Quietest tyres
Most economical tyres
Best anti-aquaplaning tyres

Other popular sizes

215/65 R16121 Tyres215/60 R17105 Tyres205/55 R1691 Tyres225/55 R1787 Tyres185/65 R1585 Tyres215/60 R1685 Tyres225/45 R1783 Tyres205/60 R1681 Tyres

315/40 R21 — Also available in

Summer(28)Winter(23)

Top brands in 315/40 R21

Michelin(1)

Did you know ...?

315/40 R21 doesn't belong to the most popular dimensions for allround tyres - there are 0 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 40 is height of the tyre, which is calculated as 40% of the tyre width (315mm), which means the sidewall height has 126 mm. The wheel diameter is R21, which means it fits to a 21 inch/533.4mm diameter wheel. The total circumference of the tyre is 2467.41 mm, which is very similar to 275/55 R19(2466.46 mm), 285/40 R22(2471.81 mm), 275/50 R20(2459.87 mm), 255/55 R20(2477.15 mm), 275/65 R17(2479.66 mm), 285/45 R21(2481.54 mm), 275/45 R21(2453.27 mm). There are multiple speed indexes available for allround tyres in 315/40 R21: Y(300km/h). The same goes for weight indexes: 115.

TheTireLab.com

GET

TheTireLab.com

Compare tyres, read test results and find the best prices — all in one app.