Picture it: a bend on a mountain road, a thump from the front wheel, and the steering pulling to one side. You pull over, climb out, open the boot, lift the floor panel and find no spare wheel at all. Just a small can and a plug-in pump.
That isn’t a mistake by the rental company. Most Tenerife hire cars, particularly economy and hybrid models, now carry a sealant-and-compressor kit instead of a spare. It’s legal, it saves the company weight and boot space, and plenty of renters find out only when they need it. This guide explains what the kit can and can’t fix, what to check before you leave the car park, and who pays for the tyre.
What’s Under the Boot Floor
Lift the floor panel and you’ll find one of three things, or in a few cases nothing at all.
| What’s in the boot | What it fixes | What it won’t fix |
|---|---|---|
| Sealant and compressor kit | Small punctures in the tread (a nail or screw) | Sidewall cuts, blowouts and large punctures |
| Space-saver spare | Any flat, as a temporary measure | Long distances or high speeds; it’s smaller and lower-rated than a normal tyre |
| Full-size spare | Any flat, properly | Nothing: this is the real fix |
| Nothing | Nothing | Everything: call roadside assistance |
The sealant kit is the cheapest option for rental companies to stock, which is why it has become so common. On small hatchbacks and hybrids, a repair kit rather than a wheel is now the norm rather than the exception.
Check It Before You Drive Off
The best moment to find out what you have is at pickup, not 40 minutes up a mountain road. It takes about thirty seconds, and it fits into the inspection you should already be doing.
| Check | Why it matters |
|---|---|
| Lift the boot floor and see which of the options above you have | You know what you’re working with before you need it |
| If it’s a sealant kit, check the compressor and can are really there | Previous renters sometimes use a kit and nobody replaces it |
| Ask the desk: “Does this car have a spare wheel, or just a repair kit?” | It takes ten seconds and the answer is on record |
| Photograph all four tyres, including the sidewalls | Evidence if a tyre issue is questioned at return |
Our inspection checklist covers the rest of what to photograph and film at pickup, and it’s the same habit applied to a different part of the car.
A Flat on a Mountain Road: The First Ten Minutes
Roads like the TF-436 to Masca, the Anaga mountain roads and the TF-21 up to Teide are narrow with little or no shoulder, and a stopped car on a bend is a real danger. Loose gravel, sharp verges and roadside debris on routes like these also make punctures somewhat more likely than on the motorways, which is another reason to know what’s in your boot before you head up. Our driving in Tenerife guide shows which roads are the demanding ones.
| Situation | What to do |
|---|---|
| Flat tyre on a narrow road | Pull over somewhere flat and visible, hazard lights on, passengers out and away from the carriageway |
| Small tread puncture and a working sealant kit | Use the kit, then drive carefully at reduced speed to the nearest tyre garage |
| Sidewall tear, blowout or no usable spare | Don’t drive on it; call the number on your rental agreement |
| Unsure what’s wrong | Treat it as the second case and call |
On that last call, use the number in your rental agreement, not a breakdown truck you found online. Going outside the company’s own assistance line is often what turns a covered call-out into a disputed charge. Our guide to breakdowns in a hire car walks through what normally happens next.
A sealant kit is a temporary fix meant to get you to a garage, not a way to continue a day of driving. Once the tyre is sealed, head straight for repair.
Using a Sealant Kit, Step by Step
Kits differ, so read the label on yours first. Most work along the same lines:
| Step | What to do |
|---|---|
| 1 | Stop somewhere safe and flat, hazard lights on, handbrake set |
| 2 | Read the instructions on the can and compressor, and note any warning about objects stuck in the tyre (most kits say to leave a nail or screw in place) |
| 3 | Connect the sealant to the tyre valve and the compressor to the car’s 12V socket, as shown in the kit’s diagram |
| 4 | Inject the sealant and inflate to the pressure printed on the door frame, fuel flap or in the handbook |
| 5 | Drive gently for a few kilometres so the sealant spreads, then stop and check the pressure again |
| 6 | Head straight to a tyre garage and tell them a sealant was used, since it affects how they repair or replace the tyre |
If the pressure won’t hold, or you can see a cut in the side of the tyre, stop there and call the assistance line instead of trying a second can.
Who Pays for the Tyre
Tyre damage is usually treated separately from the rest of your cover, and this is the point where renters most often get caught out.
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| Part of your cover | What it normally means for a flat |
|---|---|
| Breakdown assistance included in the rental | Usually covers getting you moving again, such as a tow or a repair visit, not the tyre itself |
| The company’s excess or waiver cover | Varies: some policies carve out tyres, windscreen and undercarriage as separate items, even “zero excess” ones |
| A third-party excess policy bought separately | Varies: some cover punctures, some only collision damage; read the wording |
| A true no-deposit rate | Should list tyres as included; confirm it, as covered in our no-deposit guide |
Without cover, replacing a tyre in Tenerife is commonly reported at somewhere between €80 and €180 depending on the car, and the company may require the same brand and model, which can push the figure higher. Treat that as a rough guide rather than a quote.
The safest move is to ask in plain words at the desk: “If I get a flat tyre, am I covered, or is that separate?” Our guides to excess insurance and car hire insurance in Tenerife explain how the layers fit together.
Which Companies Hand Over a Real Spare?
Reports from renters suggest that local Canarian operators, Cicar and Autoreisen among them, are more likely to supply a proper spare, full-size or space-saver, than the larger international budget brands, which lean harder on sealant kits. We haven’t checked boots car by car, and it depends on the exact model you’re given, so treat it as a pattern worth testing, not a promise.
The same applies if you booked through a comparison platform: the cover you chose and the car you receive aren’t the same thing. If you’re weighing platforms, our DiscoverCars notes explain how they work. Whoever you booked with, the ten-second question at pickup tells you the real answer.
After the Repair
Keep the receipt, take photos of the damaged tyre if you can, and report the problem to the rental company straight away rather than hoping nobody notices. A tyre issue that turns up at return and wasn’t flagged or covered can be charged to your deposit or card afterwards, which is exactly the situation our complaint and dispute guide helps with.
If the flat wasn’t your fault, you’re still generally responsible for the repair cost unless you can show the tyre was already defective when you took the car. That’s the reason the pickup photos of all four tyres are worth the extra thirty seconds.
Quick Questions About Flats in a Hire Car
Can I fix a flat myself with the kit?
Yes, if it’s a small puncture in the tread and your car has a working sealant and compressor kit; that’s what it’s designed for. It won’t work on a sidewall tear or a full blowout.
How far can I drive on a sealed tyre?
Only as far as the nearest tyre garage, at reduced speed. It’s a temporary fix, not a repair.
Do rental cars in Tenerife have to carry a spare?
No. Handing over a car with a repair kit instead of a spare wheel is legal, and it has become standard on many small cars.
Does comprehensive cover include tyres?
It depends on the policy. Some do, some list tyres, windscreen and undercarriage as exclusions, so read the wording or ask the desk.
Can the company charge me after I’ve returned the car?
Yes, if tyre damage is found at return and wasn’t flagged or covered, the charge can be applied to your deposit or card. Reporting any tyre problem immediately is the safer route.
Are mountain roads more likely to cause punctures?
Somewhat. Loose gravel, sharp verges and debris on routes like Masca make punctures more common than on the main motorways.
Thirty Seconds at the Desk
You can’t prevent every flat, but you can turn one from a roadside crisis into a minor errand. Lift the boot floor before you leave, ask the one question about the spare, and photograph the tyres. The rest is a phone call.