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BluEarth-A AE50

185/45R17 H (78)
4.4/5
(27 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.

  • B68 dB
    External Noise
    Noise Emission / Exterior Noise: B (68 dB)

    How loud the tyre is from outside the car, measured in decibels. Graded A to C, where A is the quietest.

  • Tick Icon Car
    Car tyre:

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

Fit from:03-09-2026
Fully Fitted Price
£12834
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What Does 185/45 R17 Mean?

185/45 R17 tyres are found on Smart cars, especially the Brabus fortwo and forfour models and on Renault's Twingo GT. The digits are easy to understand. 185 means the width in mm, 45 indicates the aspect ratio, meaning the sidewall is 45% of 185mm, which gives an 83mm sidewall for the front while these rear-engine cars have a wider rear tyre, and R17 refers to a 17-inch radial tyre. This brings the overall diameter to 598mm. We have 185/45 R17 at Tyres.co.uk.

Part of the sizeValueWhat it means
Section width 185 The width of the tyre across the tread, measured in millimetres.
Profile (aspect ratio) 45 Sidewall height as a percentage of the width - here, 45% of 185 mm (about 83 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 83.2 mm (3.28 in)
Overall diameter 598 mm (23.6 in)
Circumference 1,880 mm (74.0 in)
Revolutions 856 per mile · 532 per km
Equivalent sizes
SizeOverall diameter
205/40 R17 596 mm · -0.4%
195/50 R16 601 mm · +0.5%
185/50 R16 591 mm · -1.2%
205/45 R16 591 mm · -1.2%
195/45 R17 607 mm · +1.5%
195/40 R17 588 mm · -1.8%