Buy 305/35 R21 Tyres

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P Zero (PZ4)

305/35R21 Y (109)
  • B
    Fuel Efficiency
    Fuel Efficiency / Rolling Resistance: B

    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.

  • A72 dB
    External Noise
    Noise Emission / Exterior Noise: A (72 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
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:03-09-2026
Fully Fitted Price
£33329
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P Zero

305/35R21 Y (109)
  • 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.

  • A70 dB
    External Noise
    Noise Emission / Exterior Noise: A (70 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
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:03-09-2026
Fully Fitted Price
£43672
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Pilot Sport EV

305/35R21 Y (109)
5.0/5
(2 reviews)
  • B
    Fuel Efficiency
    Fuel Efficiency / Rolling Resistance: B

    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.

  • B74 dB
    External Noise
    Noise Emission / Exterior Noise: B (74 dB)

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

  • 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:03-09-2026
Fully Fitted Price
£46119
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Winter SottoZero 3

305/35R21 W (109)
4.5/5
(4 reviews)
  • B
    Fuel Efficiency
    Fuel Efficiency / Rolling Resistance: B

    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.

  • Tick Icon Winter
    Winter tyres:

    Designed for temperatures below 7°C. Summer tyre rubber hardens in the cold and loses grip, while a winter compound stays soft and holds the road in cold, wet and snowy conditions.

Fit from:03-09-2026
Fully Fitted Price
£53525
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305/35 R21 Numbers Explained

305/35 R21 is a wide, low-profile tyre ideal for powerful SUVs and sports cars. The first number indicates the width. Here, 305 means the width is 305 millimetres. 35 is the sidewall height as a percentage of the width. Therefore, sidewall height is 35% of 305mm which is approximately 107mm. R21 implies that this is a radial tyre made for a 21-inch diameter rim. Therefore, this tyre has an overall diameter of 747mm. Due to the large wheel used by these vehicles, this tyre has a lower sidewall height. You can find 305/35 R21, including the XL version on Tyres.co.uk.

Part of the sizeValueWhat it means
Section width 305 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 35 Sidewall height as a percentage of the width - here, 35% of 305 mm (about 107 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 106.8 mm (4.20 in)
Overall diameter 747 mm (29.4 in)
Circumference 2,346 mm (92.4 in)
Revolutions 686 per mile · 426 per km
Equivalent sizes
SizeOverall diameter
315/30 R22 748 mm · +0.1%
295/40 R20 744 mm · -0.4%
305/40 R20 752 mm · +0.7%
295/35 R21 740 mm · -0.9%
315/35 R21 754 mm · +0.9%
285/40 R20 736 mm · -1.5%