Buy 355/25 R21 Tyres

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P Zero

355/25R21 Y (107)
  • D
    Fuel Efficiency
    Fuel Efficiency / Rolling Resistance: D

    How much fuel the tyre uses as it rolls. Graded A to E, where A is the most efficient and E the least.

  • B
    Wet Grip
    Wet Grip / Braking Performance: B

    How well the tyre stops in the wet. Graded A to E, where A is the shortest stopping distance. Each grade is worth roughly 3 metres, about a car length.

  • A71 dB
    External Noise
    Noise Emission / Exterior Noise: A (71 dB)

    How loud the tyre is from outside the car, measured in decibels. Graded A to C, where A is the quietest.

Noise Reduction
  • Tick Icon Car
    Car tyre:

    Designed for cars, rather than vans, 4x4s or commercial vehicles.

  • Tick Icon Reinforced (XL)
    Extra Load or Reinforced tyres:

    A stronger sidewall lets this tyre carry more weight than a standard tyre of the same size. Marked XL on the sidewall.

Fit from:18-10-2026
Fully Fitted Price
£698.78
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Pilot Sport 4 S

355/25R21 Y (107)
5.0/5
(2 reviews)
  • C
    Fuel Efficiency
    Fuel Efficiency / Rolling Resistance: C

    How much fuel the tyre uses as it rolls. Graded A to E, where A is the most efficient and E the least.

  • A
    Wet Grip
    Wet Grip / Braking Performance: A

    How well the tyre stops in the wet. Graded A to E, where A is the shortest stopping distance. Each grade is worth roughly 3 metres, about a car length.

  • B75 dB
    External Noise
    Noise Emission / Exterior Noise: B (75 dB)

    How loud the tyre is from outside the car, measured in decibels. Graded A to C, where A is the quietest.

Wet Grip Excellence
  • Tick Icon Car
    Car tyre:

    Designed for cars, rather than vans, 4x4s or commercial vehicles.

  • Tick Icon Reinforced (XL)
    Extra Load or Reinforced tyres:

    A stronger sidewall lets this tyre carry more weight than a standard tyre of the same size. Marked XL on the sidewall.

Fit from:18-10-2026
Fully Fitted Price
£781.72
You've viewed 2 of 2 products

355/25 R21 Tyre Reviews

Overall rating5.0/5
Based on 2 reviews
Talisha Rashid
Notable improvement in grip with the new tyres.
Michelin Pilot Sport 4 S
Aislinn Taylor-James
The tyres have great traction in all weather conditions.
Michelin Pilot Sport 4 S
355/25 R21 Tyre Reviews

355/25 R21 Tyre Reviews

5.0/52 reviews

Showing 1–2 of 2 reviews

About these reviews

Tyre reviews recording 355/25 R21, across tyre brands and tread ranges. Each review identifies its tyre range.

355/25 R21 Tyre Measurements

355/25 R21 are the original rear fitment for the Bugatti Chiron. They pair with the front tyres of 285/30 R20. The numbers break down as follows. The first number of 355 is the width of the tyre in mm. The second number is the aspect ratio of the tyre. In this case it is 25% of the 355mm tyre width, which gives us 89mm. R21 denotes the rim size which is a 21-inch diameter, and it is a radial tyre. The Chiron's low side wall suits its wheels and suspension. We have 355/25 R21 at Tyres.co.uk.

Part of the sizeValueWhat it means
Section width 355 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 25 Sidewall height as a percentage of the width - here, 25% of 355 mm (about 89 mm).
Construction R Radial construction, which is what nearly all road tyres use.
Rim diameter 21 The wheel diameter the tyre fits, measured in inches.
Your tyre dimensions
MeasurementValue
Sidewall height 88.8 mm (3.49 in)
Overall diameter 711 mm (28.0 in)
Circumference 2,233 mm (87.9 in)
Revolutions 721 per mile · 448 per km
Similar sizes
SizeOverall diameter
335/30 R20 709 mm · -0.3%
335/25 R22 726 mm · +2.2%