24 Hour Mobile Tyre Fitting on the M20
Flat tyre, puncture or blowout on the M20? We come to you anywhere across J1 to J13, 24 hours a day, change the wheel or supply a tyre, and get you moving, with a fixed price agreed before we roll.
- Fixed price first
- Hard shoulder & refuges
- Cars, vans & 4x4s
- 24/7/365
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CityGrip provides 24/7 mobile tyre change on the M20, covering J1 to J13 including the hard shoulder and the emergency refuge areas on the smart-motorway sections. We fit your spare, supply and fit a replacement tyre if you have no spare, deal with locking wheel nuts and seized wheels, or recover the vehicle if the tyre cannot be changed safely on a live carriageway. Motorway mobile tyre change runs from £250 to £750 depending on the tyre and vehicle, with the exact price agreed before we set off. Call 07960 200253 for a mobile tyre fitter near you on the M20.
The M20 is Britain’s route to the Channel Tunnel and Dover, dominated by freight and prone to Operation Brock contraflows when the ports back up. A flat tyre in a narrowed contraflow with lorries either side is a genuinely dangerous place to be. Our tyre vans and network cover the M20 from the M25 down to Folkestone, reaching your junction with the right kit.
How we decide whether a tyre on the M20 can be repaired, and when it cannot
Not every flat tyre on the M20 can be repaired. We assess the damage against BS AU 159, the British Standard for repairs to tyres for motor vehicles used on the public highway, and we assess tread against Regulation 27 of the Road Vehicles (Construction and Use) Regulations 1986. If the tyre falls outside those limits we will tell you it needs replacing rather than patch it and hand it back. Mobile tyre fitting on ordinary roads starts from £140. On a motorway or hard shoulder it is £250 to £750, because the work is done alongside live traffic and takes more time, more equipment and more care.
The repairable area is measured, not guessed
BS AU 159 sets a repairable band across the tread as a percentage of the tyre’s nominal section width: 60% up to and including 155mm, 65% over 155mm up to 200mm, and 70% over 200mm. On a 205 section tyre that is a 144mm band; on a 225 it is 158mm. Damage outside that band is not repairable. It is not the same thing as the “central three quarters” wording in the tread depth law, which is the mix-up most tyre pages make.
Maximum injury size, and why the tyre comes off the wheel
Measured at the base of the injury after preparation, the maximum diameter of penetration damage is 6mm. The standard requires the tyre to be removed from the wheel and inspected inside and out before any repair, because the damage that decides the answer is often only visible from the inside. A plug pushed into a tyre that is still on the rim is not a repair the standard recognises.
What the standard does not accept
Liquid sealants, externally applied plugs, an inner tube fitted into a tubeless tyre and temporary repairs all sit outside BS AU 159. Sidewall damage beyond cosmetic scuffing is not approved for repair at all. There is no limit on the number of minor repairs inside the repairable band provided the patches do not overlap, and a tyre repaired correctly keeps its original speed and load capabilities.
Tread depth and the law
Regulation 27 requires at least 1.6mm of tread depth throughout a continuous band covering the central three quarters of the breadth of tread, right round the tyre. A cut over 25mm, or 10% of the section width if that is greater, deep enough to reach the ply or cord makes the tyre illegal, as does any lump, bulge or tear caused by separation, or any exposed cord. In the MOT, tread below the requirement is recorded as a Dangerous defect. TyreSafe puts the penalty at up to £2,500 and three penalty points, per tyre.
TPMS, explained properly
Direct TPMS uses a battery powered sensor inside each wheel, each with its own ID that has to be registered to the car so it knows which sensor is where. Indirect TPMS has no sensors and infers a soft tyre from wheel speed through the ABS, so it needs resetting and a period of driving to relearn after a tyre change. Sensor batteries are sealed in, typically last five to ten years and cannot be replaced separately, so a sensor that dies during a wheel change means a new sensor. On an M1 car first used on or after 1 January 2012, a TPMS malfunction is a Major MOT defect, so we tell you at the roadside rather than let you find out at the test.
Run-flats and locking wheel nuts
Bridgestone rates its run-flat technology for up to 50 miles at up to 50mph after a loss of pressure, and run-flats need TPMS to work, because you cannot feel the deflation. Once a run-flat has been driven on while flat it is replaced, not repaired, because the internal damage cannot be seen. For a lost locking wheel nut key we try a master key set first, which takes the nut off undamaged. If the nut is rounded or the pattern is unknown, a reverse threaded extractor socket grips and removes it, but the nut is destroyed doing so and needs replacing.
When we will not fit or repair at the roadside on the M20
- Any position on a live carriageway where working alongside traffic is not safe. We recover the vehicle to somewhere safe and fit it there instead.
- Damage outside the repairable band, or a penetration larger than 6mm measured at the base after preparation.
- Sidewall damage beyond cosmetic scuffing, and any tyre with exposed cords, a lump, bulge or tear from separation, or belt separation.
- Any tyre that has been driven on while flat, run-flats included, because of the secondary damage that cannot be inspected away.
- Tread already below 1.6mm across the legal band, a broken bead core, liner deterioration, solvent contamination, or an earlier repair that falls outside the standard.
- A replacement whose load index or speed rating is below the vehicle manufacturer’s specification. Fitting one is a Major MOT defect, and a load rating insufficient for the axle weight is a Dangerous one, so we source the correct tyre rather than fit what is nearest.
Wheel nuts and bolts go back to the vehicle manufacturer’s torque figure with a calibrated torque wrench, in a star pattern, in stages. Judging by feel or finishing with an impact gun risks stretched or snapped studs, distorted brake discs and cracked alloys. The familiar re-torque intervals, 30 minutes stationary or 40 to 80km of driving, come from commercial vehicle guidance rather than car law, but we will re-check on request.
If a tyre cannot be repaired and we do not carry the right size for your vehicle, we say so on the phone before setting off rather than after arriving. Where a roadside fit is not the safe answer, recovery is: we are a vehicle recovery firm first, so the car can be moved rather than left where it is.
If you stop on the the M20 itself, follow the National Highways procedure before anything else: get as far left as you can, use the hard shoulder or an emergency area, leave the car by the nearside doors, and get behind the barrier and up the bank. Do not attempt a wheel change on the hard shoulder. If you are stopped in a live lane and cannot get out safely, stay belted in with your hazard lights on and call 999. This procedure is why motorway work is priced at £250 to £750 rather than £140, and why some motorway jobs end in recovery to a safe place rather than a roadside fit.
CityGrip Recovery, Leyton, London E10. We are based in Leyton, London E10, and cover the M20 from there; motorway callouts run to a set live-traffic procedure. Questions before you book: 07960 200253. Standards and prices on this page last checked 8 August 2026.
M20 mobile tyre FAQs
Do you cover the M20 to the Eurotunnel and Dover?
Yes. We cover the M20 from Junction 1 at Swanley to Junction 13 at Folkestone, including Junction 11a for the Eurotunnel and the Dover approaches. If you have a crossing booked, tell us when you call and we will give a realistic arrival time.
What if Operation Brock is in place on the M20?
When Operation Brock is deployed the moveable barrier changes the lane layout and can remove the usable hard shoulder, so a flat tyre is more dangerous. Tell us Brock is in place, which side you are on and the junction, so we route to you correctly.
What do I do if I get a flat while Operation Brock is running on the M20?
Operation Brock narrows the lanes and removes the usable hard shoulder, so stopping among queuing lorries is dangerous. If you can, reach the next exit. Tell us Brock is in place, which side of the barrier you are on and your junction, so we route to you correctly.
How much is a mobile tyre change on the M20?
Motorway mobile tyre change runs from £250 to £750. It costs more than an ordinary roadside tyre change (from £90) because it is done on a live, high-speed carriageway with the correct warning equipment and safety procedures. A common tyre on a standard car sits at the lower end; a large, low-profile, run-flat or 4×4 tyre supplied at night sits at the upper end. We agree the exact figure on the phone before we set off.
Can you fit a tyre if I have no spare near J1 Swanley & M25 on the M20?
Yes. Most new cars carry no spare, only a sealant kit, which cannot fix a sidewall cut or a blowout. We can supply and fit a matching tyre at the roadside near J1 Swanley & M25 where it is safe to do so, or recover you towards J7 Maidstone services if it is not.
Should I change the tyre myself between J1 Swanley & M25 and J13 Folkestone & Dover on the M20?
No. Changing a wheel anywhere on the M20, whether that is up by J1 Swanley & M25 or down towards J13 Folkestone & Dover, is one of the most dangerous things you can do on a motorway. Get everyone out of the left-hand doors and behind the safety barrier, and call us. If you are stuck in a live lane and cannot get out safely, stay belted in with your hazards on and call 999.
How do I tell you exactly where I am on the M20?
Give us 'M20', the last junction you passed (for example J8 Leeds Castle), your direction of travel, and the number on the nearest blue marker post or the driver location sign on the verge. That pins your position to within about 100 metres so we reach you quickly.
Can you change tyres on vans and 4x4s on the M20?
Yes. We change tyres on cars, vans, 4x4s and light commercials anywhere along the M20, and carry the equipment for larger wheels, locking nuts and wheels seized to the hub.
My car has run-flat tyres, do I still need you on the M20?
Run-flats let you keep going a limited distance at reduced speed, typically around 50 miles at up to 50mph, but that is a get-you-off-the-M20 measure, not a repair, and many run-flats cannot be repaired at all once run flat. Leave at the next exit if you safely can, then call us to supply and fit a replacement or recover you.
My tyre pressure warning light has come on near J3 M26, can I carry on?
Treat it as a warning that something is wrong. A slow puncture can become a blowout at M20 speeds. Ease off, leave at the next exit if you can do so safely and check the tyre. If it is going down, do not carry on, get somewhere safe and call us.
What is the legal tyre tread depth for driving the M20?
The legal minimum is 1.6mm across the central three-quarters of the tread and around the whole circumference, the same limit anywhere in the UK. Below that you risk a fine and penalty points for each illegal tyre, and grip and wet braking fall away long before you reach the limit. Any tyre we supply and fit is legal and correctly matched to your vehicle.
Updated July 2026. Lines open 24 hours. Call 07960 200253 for a mobile tyre change on the M20 now.
Flat tyre on the M20? Get behind the barrier and call us.
24/7 mobile tyre change on the M20, £250 to £750, with a fixed price agreed before we roll.