305/55 R20 Tyres

Compare 305/55 R20 tyres from leading manufacturers, suited to large American trucks where maximum load capacity with dependable off-road grip matters most.

Buy 305/55 R20 Tyres

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305/55R20 Q (121) Image
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    Fuel Efficiency / Rolling Resistance: -

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

  • -
    Wet Grip / Braking Performance: -

    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.

  • -B
    Noise Emission / Exterior Noise: -

    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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Mud Terrain T/A KM3

305/55R20 Q (121)
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    Car tyre:

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

We can fit: 20-04-2026
Fully Fitted Price
£43148
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305/55 R20 is a popular tyre size for heavy-duty SUVs where a balance of on-road comfort, off-road capability and load-carrying strength is required. You will commonly see this size fitted to Chevrolet Silverado and Ford F-150 variants, handling everything from school runs to towing and light off-road trails. When buying 305/55 R20 tyres, pay close attention to the load index and consider whether an all-terrain or highway-terrain pattern best suits your driving habits. Browse 305/55 R20 tyres on Tyres.co.uk, compare brands and seasonal options, then order with free local fitting.

Buying 305/55 R20 Tyres: FAQ

305 is the tyre width in millimetres, 55 is the aspect ratio showing sidewall height as a percentage of the width, R means radial construction, and 20 is the wheel rim diameter in inches. Always match these numbers exactly when replacing your tyres to ensure correct fitment and safe handling.

305/55 R20 is a popular fitment on Chevrolet Silverado and Ford F-150 variants. The specific vehicles using this size can vary by model year and trim level, so always confirm the correct size from your door-jamb sticker, fuel cap label or owner's handbook before purchasing.

You should only fit an alternative size if your vehicle manufacturer explicitly approves it. Changing from 305/55 R20 can affect speedometer accuracy, handling balance, ABS calibration and fuel economy. If you are unsure, match the exact 305/55 R20 specification printed on your existing tyres or listed in your owner's manual.

Summer 305/55 R20 tyres deliver the best grip and shortest braking distances in warm, dry conditions. Winter 305/55 R20 tyres with the three-peak mountain snowflake symbol are designed for temperatures below 7°C and perform better on ice and snow. All-season 305/55 R20 tyres offer a year-round compromise and are a practical choice for UK drivers who prefer not to swap sets seasonally.

The required load index and speed rating for your 305/55 R20 tyres are printed on your existing tyre sidewall, typically as a code like 91V or 104T immediately after the size marking. Always match or exceed these values — never fit a tyre with a lower load or speed rating than specified. Your vehicle handbook and the label inside the driver's door frame also list the correct ratings.