325/30 R21 Tyre Reviews

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Potenza Sport

325/30R21 Y (108)

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.
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.
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.

Noise Reduction

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£329^.91

Quantity

Sport Contact 7

325/30R21 Y (108)

5.0/5

(3 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

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£341^.98

Quantity

Pilot Sport 4 S

325/30R21 Y (108)

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.
B73 dB
External Noise

Noise Emission / Exterior Noise: B (73 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

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£422^.92

Quantity

Pilot Super Sport

325/30R21 Y (108)

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.
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.
B73 dB
External Noise

Noise Emission / Exterior Noise: B (73 dB)
How loud the tyre is from outside the car, measured in decibels. Graded A to C, where A is the quietest.

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£445^.07

Quantity

Pilot Sport 4

325/30R21 Y (108)

4.7/5

(3 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.
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.
B73 dB
External Noise

Noise Emission / Exterior Noise: B (73 dB)
How loud the tyre is from outside the car, measured in decibels. Graded A to C, where A is the quietest.

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£469^.84

Quantity

Pilot Sport S 5

325/30R21 Y (108)

4.6/5

(10 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.
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.
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.

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£485^.02

Quantity

P Zero Corsa (PZC4)

325/30R21 Y (108)

4.9/5

(8 reviews)

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.
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.

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£515^.18

Quantity

Pilot Sport Cup 2

325/30R21 Y (108)

4.5/5

(2 reviews)

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.
C
Wet Grip

Wet Grip / Braking Performance: C
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.
B73 dB
External Noise

Noise Emission / Exterior Noise: B (73 dB)
How loud the tyre is from outside the car, measured in decibels. Graded A to C, where A is the quietest.

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£519^.52

Quantity

Eagle F1 Supersport RS

325/30R21 Y (108)

4.9/5

(15 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.
D
Wet Grip

Wet Grip / Braking Performance: D
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.

Car

Car tyre:
Designed for cars, rather than vans, 4x4s or commercial vehicles.
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:19-10-2026

Fully Fitted Price

^£560^.92

Quantity

Passion P9S

325/30R21 W (104)

5.0/5

(1 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.
BB dB
External Noise

Noise Emission / Exterior Noise: B (B dB)
How loud the tyre is from outside the car, measured in decibels. Graded A to C, where A is the quietest.

Car

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

Fit from:19-10-2026

Fully Fitted Price

^£181^.19

Quantity

You've viewed 10 of 10 products

Overall rating4.8/5

Based on 48 reviews

Marnie-Rae Merryn

Functions correctly in all weather conditions. Always make sure the tyres are matched.

Michelin Pilot Sport 4

Finlay Gillett

Very well - as anticipated.

Pirelli P Zero

Daniel Isa

No problems here, everything was well packaged for delivery.

Goodyear Eagle F1 Supersport RS

325/30 R21 Tyre Reviews

4.8/548 reviews

Showing 31–40 of 48 reviews

About these reviews

Tyre reviews recording 325/30 R21, across tyre brands and tread ranges. Each review identifies its tyre range.

5/5

Goodyear Eagle F1 Supersport RS

I feel safe driving in the rain because the tyres perform excellently in both dry and wet conditions.

5/5

Goodyear Eagle F1 Supersport RS

There is a great grip along with a quiet and a comfortable ride.

4/5

Michelin Pilot Sport S 5

Very pleased, the performance is what I anticipated.

5/5

Michelin Pilot Sport S 5

Amazing performance, I recommend it to others.

5/5

Pirelli P Zero Corsa (PZC4)

Does not live up to expectations for what was paid.

5/5

Michelin Pilot Sport 4 S

All weather tyres work great no matter the weather.

5/5

Goodyear Eagle F1 Supersport RS

The instant improvement was obvious as soon as the tyres were put on. They have amazing grip in the dry, as well as the wet. I have never been so confident in my car's handling, it has made such a big difference.

5/5

Goodyear Eagle F1 Supersport RS

These tyres made a big difference in my experience with driving. The handling when going through corners is great and the amount of noise from the road is much lower than with my old tyres. They are worth every penny I spent on them.

5/5

Goodyear Eagle F1 Supersport RS

Incredible grip especially with wet traction situations.

4/5

Pirelli P Zero

Good tyre but I prefer Michelin Pilot Sports for wet conditions.

325/30 R21 is the rear tyre size for Porsche 911 GT3 RS and GT2 RS models from the 991 generation. The meaning of the numbers is simple. 325 means the tyre width in millimetres. 30 means the tyre has an aspect ratio of 30%, resulting in a sidewall of 98mm. R21 means the tyre is of radial construction and is fitted to a 21-inch rim, resulting in an overall diameter of 728mm. The sidewall of 98mm is in line with the staggered layout. The XL versions are dominant, and we stock them at Tyres.co.uk.

Part of the size	Value	What it means
Section width	325	The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio)	30	Sidewall height as a percentage of the width - here, 30% of 325 mm (about 98 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

Measurement	Value
Sidewall height	97.5 mm (3.84 in)
Overall diameter	728 mm (28.7 in)
Circumference	2,288 mm (90.1 in)
Revolutions	703 per mile · 437 per km

Similar sizes

Size	Overall diameter
315/35 R20	728 mm · +0.0%
335/25 R22	726 mm · -0.3%
315/30 R21	722 mm · -0.8%
305/35 R20	722 mm · -0.9%
325/35 R20	736 mm · +1.0%
305/30 R21	716 mm · -1.6%