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Pilot Sport 4 S

305/25R21 Y (98)

5.0/5

(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.
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

^£363^.58

Quantity

You've viewed 1 of 1 products

305/25 R21 Tyre Reviews

Overall rating5.0/5

Based on 2 reviews

Zahrah Coral

I know these tyres pretty well, so I know of their quality.

Michelin Pilot Sport 4 S

Fatiha Ellison

You'll feel confident driving in any condition as there is great grip on both wet and dry roads.

Michelin Pilot Sport 4 S

305/25 R21 Tyre Reviews

5.0/52 reviews

Showing 1–2 of 2 reviews

About these reviews

Tyre reviews recording 305/25 R21, across tyre brands and tread ranges. Each review identifies its tyre range.

5/5

Michelin Pilot Sport 4 S

I know these tyres pretty well, so I know of their quality.

5/5

Michelin Pilot Sport 4 S

You'll feel confident driving in any condition as there is great grip on both wet and dry roads.

305/25 R21 is a low profile size common on performance cars and often found in staggered sets. To break down the numbers, 305 is the width of the tyre in mm. 25 is the sidewall height which in this case is 25% of 305mm which works out to 76mm. R21 indicates a radial tyre on a 21-inch rim. The overall diameter would be 686mm. This means there is not much tyre depth between the road and the wheel. You can buy 305/25 R21 on Tyres.co.uk.

Part of the size	Value	What it means
Section width	305	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 305 mm (about 76 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	76.2 mm (3.00 in)
Overall diameter	686 mm (27.0 in)
Circumference	2,155 mm (84.8 in)
Revolutions	747 per mile · 464 per km

Similar sizes

Size	Overall diameter
295/30 R20	685 mm · -0.1%
295/25 R21	681 mm · -0.7%
305/30 R20	691 mm · +0.7%
285/30 R20	679 mm · -1.0%
325/25 R21	696 mm · +1.5%
315/30 R20	697 mm · +1.6%