255/50 R21 Tyre Reviews

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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

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 11–20 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

Goodyear Eagle NCT5

No issues so far, especially in rainy conditions.

5/5

I changed to the Michelin Pilot Sport EV from a different brand and the difference is obvious. Much quieter, more responsive, and significantly better grip in adverse conditions. I've been really impressed and can't recommend them more.

5/5

Bridgestone Alenza 001

Long lasting with low tyre noise, good wear and comfort.

5/5

Michelin Pilot Sport EV

Fitted these to my electric SUV and the difference is obvious straight away. They are far quieter than the tyres the car came on and the range has not dropped at all, if anything it is a touch better. Grip in the wet is very good and they cope well with the weight and the instant torque. Not cheap, but I would buy them again.

3/5

Goodyear Eagle NCT5

Durable tyres at an affordable price.

4/5

Continental Sport Contact 5

The tyres provide superb capabilities and make for a safe and pleasant ride.

3/5

Goodyear Eagle NCT5

Squealing with roundabouts and a lot of road noise on the A180 concrete took and covered 2500 miles before wearing out. Still, considering what I paid, it is not too shabby.

5/5

Continental Sport Contact 5

I am really satisfied with the tyres.

3/5

Goodyear Eagle NCT5

I primarily drive on motorways and this tyre has shown considerable durability in those conditions.

4/5

Bridgestone Alenza 001

Very well performing.

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%