355/25 R21 - Best summer tyres 2026 - market overview, tests, reviews

Summer

6

Tyres

We recommend

Premium

PILOT SPORT 4 S

9.6

£441

Buy Details

Best deals

Best tyres in tests (2026)

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Premium

Pilot Sport 4 S

'26#1

'26#5

'25#2

9.6

Price from

£441

Price from£441

Expert summary

Pilot Sport 4S is the sportier version of the Pilot Sports and the most sporty one that still cares about the wet performance, which is it's strong suite. It's usually expensive, but also a guarantee of a great performance tyre.

Recommended

#10

2026

theTire Lab.comRecommended#10 Summer tires 2026

Performance

Wet side guide

100%

Dry handling

92%

Dry steering response

85%

+10

Exterior noise

47%

Wet handling - objective

20%

Interior noise

14%

Test results

2026225/40 R18#1(Highly recommended)

2026255/35 R19#5(Good)

2025295/30 R20#2(Exemplary)

2025225/40 R18#3(Highly recommended)

2025245/35 R19#4(Exemplary)

2024265/35 R19#2(Exemplary)

2023225/40 R18#3(Very good)

2022255/35 R19#2(-)

2021255/35 R19#1(Very good)

2021265/35 R20#3(Exemplary)

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Price variants (1)

355/25 R21 107 Y

A C 75dB

£441

mytyres.co.uk

£441

In stock · Free shipping

Buy

tyres-pneus-online.co.uk

£498

In stock · Free shipping

Buy

355/25 R21 tyre test

Personalize →

Best tyres in your size

Dry

1. Michelin Pilot Sport 4 S

91%

Wet

1. Michelin Pilot Sport 4 S

77%

Comfort

1. Michelin Pilot Sport 4 S

48%

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

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Customer reviews

242 customer reviews for tyres in this size

Pirelli P ZERO 3/5 (122)

Michelin Pilot Sport 4 S 3.9/5 (120)

Other popular sizes

0/0 R0336 Tyres 205/55 R16231 Tyres 225/45 R17211 Tyres 215/65 R16208 Tyres 225/55 R17198 Tyres 225/40 R18194 Tyres 225/50 R17189 Tyres 215/60 R16185 Tyres

355/25 R21 — Also available in

Winter(1)

Top brands in 355/25 R21

Michelin(1)

Did you know ...?

355/25 R21 doesn't belong to the most popular dimensions for summer tyres - there are 4 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 25 is height of the tyre, which is calculated as 25% of the tyre width (355mm), which means the sidewall height has 88.75 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 2233.36 mm, which is very similar to 285/40 R19(2232.42 mm), 215/65 R17(2234.61 mm), 235/65 R16(2236.5 mm), 255/40 R20(2236.81 mm), 255/45 R19(2237.13 mm), 205/55 R19(2224.56 mm), 235/60 R17(2242.47 mm). There are multiple speed indexes available for summer tyres in 355/25 R21: Y(300km/h). The same goes for weight indexes: 107.