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Home  >  285 / 40 21  >  Sonix Tyres  >  Sonix 285 / 40 21
Identify the size of your tyre
The exact dimensions of a tyre can be found on the sidewall printed mark. The graphic shows how to read properties and dimensions of the tyre:
 
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SPEED INDEX:
The speed index indicates the maximum speed intended for the tyre. Up to this value, the manufacturer guarantees optimum operation with the appropriate tyre pressure. The maximum speed allowed for this vehicle is given in the vehicle owner's manual; this information can be used to select the appropriate speed index for the tyre. The speed index is the last mark on the sidewall of the tyre.
 
Load Index
Permissible maximum axle load per tyre in kg. To be found in the registration certificate or vehicle registration document or read directly from the tyre (two-digit number). It is permitted to fit a tyre with a higher load index.
 
Driving safety despite puncture
Runflat tyres are puncture-resistant tyres with reinforced sidewalls. This creates the so-called run-flat property. In the event of damage, this allows the vehicle to continue driving up to a distance of approx. 100 km (and even beyond depending on the product) at a maximum speed of 80 km/h, even if the pressure has been completely lost. Run-flat tyres even prevent the tyre rubber from jumping off the rim in the event of a loss of air pressure. A flat tyre is therefore still a flat tyre, but it loses some of its drama. Note: All run-flat tyres are marked with the symbol "RSC" (Runflat System Component) and may only be fitted in vehicles with a functioning air pressure control system!
 
Tyres with increased load capacity
Reinforced tyres are designed for higher loads than normal tyres. They can be identified by the designation 'RF' (reinforced) or also 'XL' or 'Extra Load'. They are used on vans, minibuses, off-road vehicles, etc. However, their mounting alone does not automatically result in higher load capacity but also requires a correspondingly higher air pressure. Furthermore, the load capacity index specified in the vehicle documents continues to apply.
 
Tyres with extra high load capacity
The "C" in the term C tyres stands for "commercial". These tyres are specially designed for commercial vehicles. These can be, for example, lighter trucks, delivery vans, flatbed trucks or panel vans. In other words: vehicles that have to move higher loads at a comparatively lower speed. The multi-ply reinforced C tyres are therefore even more load-bearing than reinforced tyres.
 
Mobility-optimised tyres
A tyre with a sealing layer on the opposite side of the tyre tread. In the event of a puncture (e.g. by a nail), this layer blocks any loss of air, even if the foreign body causing the puncture is still in the tyre. It is not necessary to stop or change the tyres immediately at the roadside.
 
Mobility-optimised tyres
A tyre with a sealing layer on the opposite side of the tyre tread. In the event of a puncture (e.g. by a nail), this layer blocks any loss of air, even if the foreign body causing the puncture is still in the tyre. It is not necessary to stop or change the tyres immediately at the roadside.
 
Tyres optimised for electric vehicles.
Tyre developed for electric vehicles. These tyres can also be used without hesitation on vehicles with other drive systems.
 

Our offer for  Sonix    285/40  21     

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Sonix Winter Xpro 999
Sonix
Winter Xpro 999
285/40 R21 109H XL

Tyre type

 Winter tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip D Noise emissions 71 dB
just  177.06 £
limited stock
Details
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Accelera Iota ST-68
Accelera
Accelera
Iota ST-68
285/40 R21 109W XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip C Noise emissions 68 dB
just  116.50 £
available
Details
Tracmax X Privilo RS01
Tracmax
X Privilo RS01
285/40 R21 109Y

Tyre type

 Summer tyres
available
just  127.55 £
available
Details
Road Rider Strada SUV
Road Rider
Strada SUV
285/40 R21 109Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip B Noise emissions 73 dB
just  128.40 £
available
Details
Imperial Ecosport SUV
Imperial
Imperial
Ecosport SUV
285/40 R21 109Y XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip C Noise emissions 72 dB
just  129.23 £
limited stock
Details
Minerva Ecospeed 2 SUV
Minerva
Minerva
Ecospeed 2 SUV
285/40 R21 109Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip C Noise emissions 72 dB
just  133.15 £
available
Details
PowerTrac SportXwinter PT06
PowerTrac
SportXwinter PT06
285/40 R21 109H XL

Tyre type

 Winter tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance D Wet grip C Noise emissions 75 dB
just  138.81 £
limited stock
Details
Radar Dimax R8+
Radar
Radar
Dimax R8+
285/40 R21 109Y XL EVc

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip B Noise emissions 75 dB
just  139.07 £
available
Details
RoadX RXQuest Sport SUV
RoadX
RXQuest Sport SUV
285/40 R21 109W XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance B Wet grip A Noise emissions 73 dB
just  141.28 £
available
Details
Kustone Passion P9S
Kustone
Passion P9S
285/40 R21 109W XL

Tyre type

 Summer tyres
available
just  144.78 £
available
Details
Grenlander Icehawke II
Grenlander
Icehawke II
285/40 R21 109H XL

Tyre type

 Winter tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip D Noise emissions 71 dB
just  144.96 £
available
Details
Admiral GRB009
Admiral
GRB009
285/40 R21 109Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip B Noise emissions 73 dB
just  149.03 £
available
Details
Churchill GRB009
Churchill
GRB009
285/40 R21 109Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip B Noise emissions 73 dB
just  149.03 £
available
Details
RoadX SU01
RoadX
SU01
285/40 R21 109Y XL

Tyre type

 Summer tyres
limited stock
just  150.51 £
limited stock
Details
Gripmax SureGrip Pro Sport
Gripmax
SureGrip Pro Sport
285/40 R21 109Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip A Noise emissions 75 dB
just  152.79 £
available
Details
Dynamo MSU01
Dynamo
MSU01
285/40 R21 109Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip B Noise emissions 73 dB
just  152.82 £
available
Details
Dynamo Street-H Pursuit SUV
Dynamo
Street-H Pursuit SUV
285/40 R21 109W XL, SUV

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance B Wet grip A Noise emissions 73 dB
just  153.35 £
available
Details
RoadX SU01
RoadX
SU01
285/40 R21 109Y XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip B Noise emissions 73 dB
just  154.35 £
limited stock
Details
Sailun Atrezzo ZSR2 SUV
Sailun
Sailun
Atrezzo ZSR2 SUV
285/40 R21 109Y XL, with rim protection (MFS)

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance B Wet grip A Noise emissions 74 dB
just  156.46 £
available
Details
Unigrip Lateral Force Sport
Unigrip
Unigrip
Lateral Force Sport
285/40 R21 109Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance B Wet grip B Noise emissions 75 dB
just  158.71 £
available
Details
Tourador Winter Pro TSU1
Tourador
Winter Pro TSU1
285/40 R21 109V XL

Tyre type

 Winter tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance D Wet grip C Noise emissions 73 dB
just  160.97 £
limited stock
Details
Arivo Winmaster ARW 5
Arivo
Winmaster ARW 5
285/40 R21 109H XL

Tyre type

 Winter tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip D Noise emissions 71 dB
just  165.25 £
limited stock
Details
Maxxis Victra Sport 6 SUV
Maxxis
Maxxis
Victra Sport 6 SUV
285/40 R21 109Y XL, with rim protectionleiste (FSL)

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip A Noise emissions 72 dB
just  188.99 £
available
Details
Gripmax Suregrip Pro Winter
Gripmax
Suregrip Pro Winter
285/40 R21 109V XL

Tyre type

 Winter tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance C Wet grip B Noise emissions 75 dB
just  195.99 £
available
Details
Gripmax SureGrip A/S
Gripmax
SureGrip A/S
285/40 R21 109W XL

Tyre type

 All-season tyres
available
Client reviews rating:
Client reviews rating

More than 5 billion kilometers. Tyretest.com offers over 430 000 tests firsthand - from consumers for consumers.

(4)
Average based on 4 test results  N/A
Grip in dry conditions
Braking in dry conditions
Grip in wet conditions
Braking in wet conditions
Grip in snow
Driving comfort
Internal noise level
Tyre wear
Fuel consumption
Kilometers driven 504894
02.10.2026 from Sue Johnson
Only complaint is I got a black thorn in the side wall within a couple of weeks of them being on the car. Definitely no off road use!!! Tyre not mendable ! Had to buy another. Complained to company but they didn’t refund Very quiet tyres, really pleased with them otherwise
19.11.2021 from Ian Burton-Palmer
These tyres work really well in the wet or the dry road conditions. I also think that they are quite quiet compared the previous set of tyres I had on this vehicle. All round these are a great choice.
02.06.2021 from John Williams
A decent budget priced winter tyre. Very impressed with the grip quality in snow
(4)

Reifentest.com

just  200.49 £
available
Details
Yokohama BluEarth-Winter V906 SUV
Yokohama
Yokohama
BluEarth-Winter V906 SUV
285/40 R21 109W XL BluEarth

Tyre type

 Winter tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance D Wet grip B Noise emissions 73 dB
just  201.21 £
available
Details
Prinx Xnex Sport EV
Prinx
Xnex Sport EV
285/40 R21 109Y XL, with rim protection (MFS), EV

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance A Wet grip B Noise emissions 73 dB
just  202.68 £
limited stock
Details
Kleber Dynaxer HP 5 SUV
Kleber
Kleber
Dynaxer HP 5 SUV
285/40 R21 109H XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance B Wet grip A Noise emissions 73 dB
just  207.53 £
available
Details
There are 28 of 71 tyres displayed
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Prices include VAT and delivery within mainland UK (excl. Scottish Highlands).

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