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Sonix WINTERXPRO 999 Tyre Image
  • C
    Fuel Efficiency / Rolling Resistance: C

    Rolling resistance has a direct impact on fuel consumption. A tyre's rolling resistance score ranges from A to E.

  • D
    Wet Grip / Braking Performance: D

    A tyre's wet grip capacity is expressed in Grades from A to E. The difference in braking distances between each grade is roughly 3m - an average car length.

  • 71B
    Noise Emission / Exterior Noise: 71

    The exterior noise grade of a tyre is expressed in decibels and accompanied by an external rolling noise rating - ranging from A (least exterior noise) to C (highest level of noise).

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Sonix WINTERXPRO 999

265/45R21 Sonix WINTERXPRO 999 108H XL
  • Tick Icon Car
    Car tyre:

    These tyres have been specifically designed for fitment and use on cars.

  • Tick Icon Reinforced (XL)
    Extra Load or Reinforced tyres:

    These tyres are designed with a stronger sidewall, making them capable of handling more weight than your average tyre. Typically, they are classified by the letters 'XL' on the sidewall.

  • Tick Icon Winter
    Winter tyres:

    These are designed for improved performance at temperatures below 7°C. At this temperature the rubber in summer tyres hardens and loses performance whilst the compound of winter tyres remains supple, maintaining grip.

10% off today. On 2 or more tyres
Use Code
SAVE10
Fully Fitted price
£13799
Mail order price
£11513
Product description & features

The Sonix WINTERXPRO 999 is a winter tyre designed for everyday passenger cars needing dependable control when temperatures drop. It’s built to perform in typical UK winter conditions such as cold, wet roads, slush and occasional snowfall, helping you maintain confidence on commutes and longer motorway journeys when summer tyres can feel less predictable.

These tyres use a winter-focused tread pattern with wide grooves to move water and slush away from the contact area, supporting strong wet braking and reducing the likelihood of aquaplaning. Dense 3D-style siping creates extra biting edges that interlock with the road surface, improving traction during pull-away and aiding stability on compacted snow. A cold-weather rubber compound is designed to stay more flexible in low temperatures, so grip remains consistent as the weather changes.

On the road, an optimised footprint helps spread load more evenly for steadier cornering and more uniform wear over the season. The casing is tuned for a controlled, comfortable drive, with tread blocks arranged to limit unnecessary vibration and road noise for daily use. Sonix WINTERXPRO 999 tyres are offered in a broad range of common car sizes to suit many hatchbacks, saloons and estates.

You can buy the Sonix WINTERXPRO 999 online in all available sizes on Tyres.co.uk, then choose fitting at a nearby garage of your choice or opt for delivery to suit your plans.