255/40 R17 Tyres

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255/40R17 W (94) Image
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255/40R17 W (94)
  • 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.

  • 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.

Wet Grip Excellence
  • Tick Icon Car
    Car tyre:

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

Fit from:21-10-2026
Fully Fitted Price
£219.35
255/40R17 Y (94) Image
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Ecsta PS71

255/40R17 Y (94)
4.4/5
(10 reviews)
  • E
    Fuel Efficiency
    Fuel Efficiency / Rolling Resistance: E

    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.

  • 72dB
    External Noise
    Noise Emission / Exterior Noise: 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
  • Tick Icon Car
    Car tyre:

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

Fit from:21-10-2026
Fully Fitted Price
£134.82
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255/40 R17 Tyre Reviews

Overall rating4.6/5
Based on 21 reviews
Ada Gitty
The tyres provide excellent grip which instills me with confidence managing corners and driving in wet conditions - a must in Scotland!
Kumho Ecsta PS71
Vikki N.
Switching from run-flat tyres to these tyres, I noticed a better quality of ride and better grip in all weather conditions. Additionally, great service from the technician at…
Goodyear Eagle F1 (Asymmetric 2)
Helen T.
Provides a sense of security during the recent seriously wet winter conditions, and it significantly reduces the noise of the road. This brand didn't come to mind before, but I…
Kumho Ecsta PS71
Read more reviews
255/40 R17 Tyre Reviews

255/40 R17 Tyre Reviews

4.6/521 reviews

Showing 21–21 of 21 reviews

About these reviews

Tyre reviews recording 255/40 R17, across tyre brands and tread ranges. Each review identifies its tyre range.

5/5

Goodyear Eagle F1 (Asymmetric 2)

Amazing tyres! Goodyear always gets my vote. They grip the road great and they brake well in the rain. They make me feel safe and steady whether its wet or dry.

255/40 R17 Tyre Specifications

255/40 R17 is a staggered low profile rear fitment for certain Porsche 911 and Boxster S models. 255 is the width in mm, and 40 is the aspect ratio. So, 40% of 255mm gives 102mm sidewall, which is the height of the tyre; in a performance or sports car this sidewall is kept low to manage flex of the tyre in a turn. R17 means radial and 17 inches. This size has an overall diameter of 636mm. Tyres.co.uk has 255/40 R17 in stock.

Part of the sizeValueWhat it means
Section width 255 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 40 Sidewall height as a percentage of the width - here, 40% of 255 mm (about 102 mm).
Construction R Radial construction, which is what nearly all road tyres use.
Rim diameter 17 The wheel diameter the tyre fits, measured in inches.
Your tyre dimensions
MeasurementValue
Sidewall height 102.0 mm (4.02 in)
Overall diameter 636 mm (25.0 in)
Circumference 1,997 mm (78.6 in)
Revolutions 806 per mile · 501 per km
Similar sizes
SizeOverall diameter
255/35 R18 636 mm · -0.0%
265/35 R18 643 mm · +1.1%
245/35 R18 629 mm · -1.1%
235/45 R17 643 mm · +1.2%
245/40 R17 628 mm · -1.3%
245/45 R16 627 mm · -1.4%

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