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Home  >  275 / 45 21  >  Sonix Tyres  >  Sonix 275 / 45 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   275/45  21     

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Chengshan CSC-303
Chengshan
Chengshan
CSC-303
275/45 R21 110Y XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip CNoise emissions 73dB
just  152.57 £
limited stock
Details
Unigrip Lateral Force Sport
Unigrip
Unigrip
Lateral Force Sport
275/45 R21 110Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip BNoise emissions 73dB
just  152.82 £
available
Details
Gripmax SureGrip A/S
Gripmax
SureGrip A/S
275/45 R21 110W XL

Tyre type

 All-season tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip BNoise emissions 73dB
Client reviews rating:
Client reviews rating

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

(3)
Average based on 3 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 driven504906
19.11.2021fromIan 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.
02.06.2021fromJohn Williams
A decent budget priced winter tyre. Very impressed with the grip quality in snow
(3)

Reifentest.com

just  154.49 £
available
Details
Fronway Eurus 08
Fronway
Eurus 08
275/45 R21 110W XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip BNoise emissions 72dB
just  155.90 £
limited stock
Details
Dynamo MSU01
Dynamo
MSU01
275/45 R21 110Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip BNoise emissions 71dB
just  156.01 £
available
Details
Double Star DW02
Double Star
Double Star
DW02
275/45 R21 110T XL

Tyre type

 Winter tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance DWet grip BNoise emissions 73dB
just  156.05 £
limited stock
Details
Grenlander Enri U08
Grenlander
Enri U08
275/45 R21 110W XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip BNoise emissions 72dB
just  158.22 £
limited stock
Details
Petlas Explero PT431 H/T
Petlas
Petlas
Explero PT431 H/T
275/45 R21 110Y

Tyre type

H/T Reifen

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip BNoise emissions 71dB
just  158.70 £
limited stock
Details
GT Radial SportActive 2
GT Radial
GT Radial
SportActive 2
275/45 R21 110Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip ANoise emissions 69dB
just  158.76 £
available
Details
Zeta Impero
Zeta
Zeta
Impero
275/45 R21 110Y XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip BNoise emissions 73dB
just  159.06 £
limited stock
Details
Dynamo Street-H Pursuit SUV
Dynamo
Street-H Pursuit SUV
275/45 R21 110W XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip ANoise emissions 71dB
just  159.24 £
available
Details
Momo Toprun M-30 Europa
Momo
Toprun M-30 Europa
275/45 R21 110Y XL

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip CNoise emissions 73dB
just  173.63 £
available
Details
Leao Winter Defender Ice-I15
Leao
Leao
Winter Defender Ice-I15
275/45 R21 107T

Tyre type

 Winter tyres
limited stock
just  181.64 £
limited stock
Details
Maxxis Victra Sport 6 SUV
Maxxis
Maxxis
Victra Sport 6 SUV
275/45 R21 110Y XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip ANoise emissions 72dB
just  182.27 £
limited stock
Details
Firestone Roadhawk 2
Firestone
Firestone
Roadhawk 2
275/45 R21 110Y XL, Enliten / EV

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip ANoise emissions 71dB
Client reviews rating:
Client reviews rating

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

(1)
Average based on 1 test results  N/A
Grip in dry conditions
Braking in dry conditions
Grip in wet conditions
Braking in wet conditions
Grip in snow  N/A
Driving comfort
Internal noise level
Tyre wear
Fuel consumption
Kilometers driven250294
29.07.2025fromTom
These tyres in my rear wheel drive BMW are grippy in the dry, but leave me yearning for more in the wet. The car will "step-out" if I punch it whilst the road is even midly damp. My tracking was done at the same time as having these fitted so that is not a factor. The car will also step out if the road is more greasy looking.
(1)

Reifentest.com

just  182.89 £
limited stock
Details
New
Goodyear Eagle F1 Asymmetric 6
Goodyear
Goodyear
Eagle F1 Asymmetric 6
275/45 R21 110Y XL, EVR

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip ANoise emissions 70dB
Client reviews rating:
Client reviews rating

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

(57)
Average based on 57 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 driven8343440
07.10.2023fromSimon Hall
Amazing tyres, grip is excellent, comfort and noise are excellent. the only thing i can fault is that the wear isn't anything special. Down to 4mm after 6000 miles. My tyre size is 245/35R18 but tyretest will not let me add the correct size above.
10.08.2023fromDanB
Excellent tyres chosen via the reviews by Jon @ tyrereviews.co.uk - they faired very well against the likes of the Michelin PS5s and at the time of buying (Feb2023) the Goodyears were £250 cheaper than the PS5s; but more or less neck & neck with them in the tyre review! That swung the decision for me, more so with the money saving!
23.09.2022fromJames g
Fuel consumption high
07.02.2022fromSpiros
Car Driven : BMW 425D 225Hp . Quite quietly from the start until the first 10,000 km they kept a relatively low noise level until the end of their lives. Relatively comfortable especially considering that is a runflat tire. The tire tread still retains its original groove and design but has significant wear points on both edge and there are some small tire detachments. In the few rains we have in Greece it never had a hadling problem or breaking and did not create any feeling of insecurity. in short it is a good quiet tire ROF tire, comfortable and efficient in fast driving.
(57)

Reifentest.com

just  184.40 £
limited stock
Details
Falken EUROALL SEASON AS220PRO
Falken
Falken
EUROALL SEASON AS220PRO
275/45 R21 110W XL BLK

Tyre type

 All-season tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip BNoise emissions 71dB
just  185.82 £
limited stock
Details
Kumho WinterCraft WS71 SUV
Kumho
Kumho
WinterCraft WS71 SUV
275/45 R21 110V XL

Tyre type

 Winter tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance DWet grip CNoise emissions 72dB
just  191.99 £
available
Details
Falken AZENIS FK520
Falken
Falken
AZENIS FK520
275/45 R21 110Y XL BLK

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip ANoise emissions 71dB
just  193.47 £
available
Details
Momo North Pole W-20
Momo
North Pole W-20
275/45 R21 110V XL

Tyre type

 Winter tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip BNoise emissions 73dB
just  195.14 £
available
Details
Kumho WinterCraft WS71 SUV
Kumho
Kumho
WinterCraft WS71 SUV
275/45 R21 110V XL

Tyre type

 Winter tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance DWet grip CNoise emissions 72dB
just  196.32 £
limited stock
Details
LASSA Competus H/P 2
LASSA
Competus H/P 2
275/45 R21 110Y XL

Tyre type

 Summer tyres
limited stock
just  196.49 £
limited stock
Details
BF Goodrich Advantage 2
BF Goodrich
BF Goodrich
Advantage 2
275/45 R21 110W XL, SUV

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip ANoise emissions 73dB
just  197.40 £
available
Details
Continental CrossContact LX Sport
Continental
Continental
CrossContact LX Sport
275/45 R21 107H MO, EVc

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip CNoise emissions 72dB
just  198.86 £
available
Details
Kleber Dynaxer HP 5 SUV
Kleber
Kleber
Dynaxer HP 5 SUV
275/45 R21 110W XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip ANoise emissions 73dB
just  199.31 £
limited stock
Details
Comforser CF1100
Comforser
CF1100
275/45 R21 113/110S 10PR

Tyre type

A/T Reifen

 All-season tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance CWet grip ENoise emissions 75dB
just  203.20 £
available
Details
Yokohama Geolandar X-CV (G057)
Yokohama
Yokohama
Geolandar X-CV (G057)
275/45 R21 110W XL

Tyre type

 Summer tyres
limited stock
EU Tyre Label
EU Tyre Label
Roll resistance DWet grip BNoise emissions 72dB
just  205.01 £
limited stock
Details
Nokian Powerproof 2
Nokian
Nokian
Powerproof 2
275/45 R21 110Y XL Aramid Sidewalls

Tyre type

 Summer tyres
available
EU Tyre Label
EU Tyre Label
Roll resistance BWet grip ANoise emissions 70dB
just  205.73 £
available
Details
There are 28 of 122 tyres displayed
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