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View 4 Products

Alenza 001

255/50R21 Y (109)

4.8/5

(5 reviews)

A
Fuel Efficiency

Fuel Efficiency / Rolling Resistance: A
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.
A68 dB
External Noise

Noise Emission / Exterior Noise: A (68 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

Great Fuel Efficiency

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:17-10-2026

Fully Fitted Price

^£278^.99

Quantity

Sport Contact 5

255/50R21 Y (109)

4.6/5

(5 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.
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.
73dB
External Noise

Noise Emission / Exterior Noise: 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:17-10-2026

Fully Fitted Price

^£337^.16

Quantity

Eagle NCT5

255/50R21 W (106)

4.0/5

(14 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.
B72 dB
External Noise

Noise Emission / Exterior Noise: B (72 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:17-10-2026

Fully Fitted Price

^£1696^.86

Quantity

Passion P9S

255/50R21 W (109)

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.
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:17-10-2026

Fully Fitted Price

^£166^.72

Quantity

You've viewed 4 of 4 products

255/50 R21 Tyre Reviews

Overall rating4.4/5

Based on 29 reviews

Fletcher Farrow

Excellent in wet areas on local roads.

Michelin Pilot Sport EV

Waniya Dorman

These came with my car when I first got it and they've always done their job excellently. They last for a very long time and provide great traction.

Goodyear Eagle NCT5

Coby G.

Fantastic price for what you get. Amazing driving experience.

Goodyear Eagle NCT5

255/50 R21 Tyre Reviews

4.4/529 reviews

Showing 1–10 of 29 reviews

About these reviews

Tyre reviews recording 255/50 R21, across tyre brands and tread ranges. Each review identifies its tyre range.

5/5

Michelin Pilot Sport EV

Excellent in wet areas on local roads.

5/5

Goodyear Eagle NCT5

These came with my car when I first got it and they've always done their job excellently. They last for a very long time and provide great traction.

4/5

Goodyear Eagle NCT5

Fantastic price for what you get. Amazing driving experience.

4/5

Continental Sport Contact 5

What can I report after driving 1000 miles? I haven't had to change the tyres and the vehicle handled very well even during very heavy rain.

4/5

Goodyear Eagle NCT5

They have good road grip and are long lasting.

5/5

Goodyear Eagle NCT5

Excellent service, especially from the fitting garage when they found the spare was bent! Mileage was impressive with 42k on the front of a diesel Mondeo. They also performed well in the snow.

5/5

Kustone Passion P9S

The arrival of the tyres was punctual, which is great!

5/5

Goodyear Eagle NCT5

These tyres are excellent. The maker of my vehicle put them on, and I have managed to get 30,000 miles out of the front ones. I am still on the original tyres on the rear.

5/5

Continental Sport Contact 5

Good traction in rain and should last long.

255/50 R21 tyres are SUV tyres and come as standard on the BMW iX. The numbers on the tyre mean the following. The 255 means the tyre is 255mm wide. The 50 refers to the aspect ratio. Therefore, the height of the sidewall is 50% of 255mm, which is 128mm. R21 means the tyre is radial with a rim diameter of 21 inches. Therefore, the overall diameter is 788mm. The iX uses the 128mm sidewall with an XL (extra load) rating. At Tyres.co.uk, we sell 255/50 R21 tyres, including XL versions.

Part of the size	Value	What it means
Section width	255	The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio)	50	Sidewall height as a percentage of the width - here, 50% of 255 mm (about 128 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	127.5 mm (5.02 in)
Overall diameter	788 mm (31.0 in)
Circumference	2,477 mm (97.5 in)
Revolutions	650 per mile · 404 per km

Similar sizes

Size	Overall diameter
255/45 R22	788 mm · -0.0%
255/55 R20	788 mm · +0.0%
235/60 R20	790 mm · +0.2%
275/50 R20	783 mm · -0.7%
275/45 R21	781 mm · -1.0%
265/45 R22	797 mm · +1.1%