Changing a wheel safely

Changing a wheel is the one job in this course that lifts a car off the ground, and the only one where the car itself can fall on you. Mazda's handbook for the Mazda3 says it in two sentences: "Changing a tyre is dangerous if not done properly. The vehicle can slip off the jack and seriously injure someone."³ Done by the handbook, on the right ground, it is a job an owner can do. This lesson is that handbook order, what each step is for as far as the makers say, and the places and conditions where the right answer is not to start.

This is the lesson the callout's jack clause belongs to. Lesson 18, "A flat tyre: the decision, and spare, space saver, sealant or run-flat", decided whether you change the wheel at all; this one assumes the answer was yes. One section below reports what the Highway Code says, and which parts are advice. This is general information, not legal advice. The rules differ between England and Wales, Scotland, Northern Ireland and each US state, and they change.

The lesson uses UK words with the US one once: tyre (tire), wheel nuts (lug nuts), boot (trunk), handbrake or parking brake, wheel brace (lug wrench: the spanner in the car's kit that turns the nuts), space saver (compact spare). Torque is in N·m (newton metres) with lbf·ft (pound-feet).

First, whether the place will do

This is general information, not legal advice.

Changing a wheel is Yours, on conditions. Lesson 18 set them out; here they are as a check you run before the boot is opened:

• Not on a motorway or other fast road, and not on a hard shoulder or in an emergency area. On a motorway, the Highway Code's Rule 277, which is advice rather than a MUST, says "DO NOT attempt repairs on your vehicle", and Green Flag, which sells breakdown cover and repairs, says not to change a tyre on a motorway "even if you're on the hard shoulder or in an emergency area".⁷⁹ On any other fast road in Great Britain the callout's steps apply (everyone out on the side away from traffic, and nobody goes back to the car), so on this course's reading there's no wheel change there either, lay-by or not; lesson 17 has those roads. On a US freeway shoulder, this course's reading is the same, and the callout's US steps apply: stay in, belted, unless the shoulder is too narrow or there's a guardrail to wait behind (lesson 16).
• Firm, level ground. Toyota: "a hard, flat surface"; Honda: "a firm, level, non-slippery surface"; Mazda: "a hard, level surface off the right-of-way".¹²³ HSE, Great Britain's workplace safety regulator, in guidance written for garages, says the same for work away from the workshop: "the ground is firm and level before raising a vehicle".⁵
• Off the road, and nobody between the car and the traffic. Mazda's handbook says to drive "to a level spot that is well off the road and out of the way of traffic", and has everyone out and "away from the vehicle and traffic".³ In Great Britain, Rule 276, again advice: "do not stand (or let anybody else stand) between your vehicle and oncoming traffic".⁷
• The car's own jack, and a handbook with the method. All three handbooks read here say to use the jack that came with the car; step 9 has their words.

The third condition is the one people miss. Kneeling at a wheel on the traffic side of a car parked at the edge of a road puts you in the traffic Mazda says to keep away from, and in Great Britain exactly where Rule 276 advises not to stand. On this course's reading, if the flat is on the traffic side and the traffic passes close, the job is Call someone, however good the ground. Lesson 13, "A flat battery and jump-starting", applied these same placement rules to a jump start: off the road if you can, hazard lights on, and nobody standing between the car and traffic.

The order, and what each step prevents

The three handbooks this lesson re-read give nearly the same order. Toyota's is for the 2023 Corolla sold in the US, Honda's for the 2024 Civic Sedan sold in the US, Mazda's for the Mazda3 in its European English edition.¹²³ Where they differ, the difference is shown. Where a handbook says why, the reason is given; where none does, this course says so and doesn't invent one.

1. Stop on firm, level ground, off the road. The first section's check.

2. Parking brake on. All three.

3. P, or a gear. Toyota: "Shift the shift lever to P." Honda: P for its CVT automatic, R for a manual. Mazda: P for an automatic, "Reverse (R) or 1" for a manual.¹²³

4. Engine off. Toyota: "Stop the engine." Honda: power mode to "VEHICLE OFF". On a hybrid or electric car, off means switched off in the way its handbook describes. Such a car can be silent and still on, and so can a petrol car whose stop-start has stopped the engine: READY isn't off, and silence proves nothing. Lesson 14, "High voltage: hybrid and EV safety, charging at home, fire and flood", has why. And while the car is on the jack, Toyota: "Do not start the engine or drive the vehicle while the vehicle is supported by the jack." Mazda gives the reason: starting the engine or shaking the car "could cause the vehicle to fall off the jack resulting in an accident."¹²³

5. Hazard lights on. All three.

6. Everyone out, and away. Mazda: "Have everyone get out of the vehicle and away from the vehicle and traffic." Toyota: "Do not raise the vehicle while someone is inside." Honda: "Do not use the jack with people or luggage in the vehicle." Mazda again gives the reason: "The occupant could cause the vehicle to fall resulting in serious injury."¹²³

7. Chock the diagonally opposite wheel. Honda: "Place a wheel block or rock in front and rear of the wheel diagonal to the flat tire." Mazda: "Block the wheel diagonally opposite the flat tyre. When blocking a wheel, place a tyre block both in front and behind the tyre."²³ Toyota's diagram puts a single chock on the same diagonal wheel, behind it for a front flat and in front of it for a rear flat.¹ And the reason, from Mazda: "Changing a flat tyre without using wheel blocks is dangerous because the vehicle may move and fall off the jack even with the shift lever in 1st or R, or the select lever is in P".³ So the parking brake and P aren't enough on their own. None of the handbooks says why the diagonal wheel in particular, and this course doesn't supply a reason.

Honda adds a step the other two don't, before the nuts are loosened: "Place the compact spare tire (wheel side up) under the vehicle body, near the tire that needs to be replaced."² Honda gives no reason, and this course doesn't supply one. It goes there while the car is still on its wheels. On this course's reading, step 12 still holds when the spare comes out again to be fitted: take hold of it from the side, and don't reach under the car.

No chock in the boot? Honda says "a wheel block or rock"; Mazda, "use rocks or wood blocks of sufficient size if possible".²³ The words that matter are "of sufficient size"; on this course's reading, a small stone is not one.

Schematic, seen from above with the front at the top, not to scale, drawn from the chocking instructions in the Honda and Mazda handbooks and Toyota's diagram on p. 374.¹²³

8. Loosen each nut about one turn, with the wheel still on the ground. Toyota: "Slightly loosen the wheel nuts (one turn)." Honda: "about one turn". Mazda: "Loosen the wheel nuts by turning them anticlockwise one turn each, but do not remove any wheel nuts until the tyre has been raised off the ground."¹²³ The handbooks don't say why the order is this way round. Green Flag, which sells breakdown cover and repairs, gives the danger it avoids, about a wheel that won't come off a raised car: "pushing and pulling it could bring the car off the jack."⁹ On this course's reading, that's the reason for doing the hard pull on the nuts while the tyre still carries the car.

If a nut won't turn with the car's own wheel brace, the job ends there, on this course's reading. No handbook read offers a way to force a nut. Honda's warning against "extra torque using your foot or a pipe" is about tightening, and on the same reading it's no better an idea for loosening. Call someone. The same goes for a locking wheel nut (one nut on the wheel that needs its own key) when the key isn't in the car; no handbook read covers them.

9. The maker's jack, at the maker's jacking point. Toyota: "Only use the tire jack that comes with this vehicle for replacing a flat tire." Honda: "Use the jack provided in your vehicle", because other jacks "may not support the weight" or "may not fit the jacking point"; and "Use only at the jacking points." Mazda: "Use only the jack provided with your Mazda", and "Use only the front and rear jacking positions recommended in this manual", because otherwise "The vehicle could slip off the jack and seriously injure or even kill someone."¹²³ The jacking points (Toyota's "jack point", Mazda's "jack-up position") are the places the handbook's drawing marks for the jack, and Honda and Mazda have you use the one closest to the flat. They aren't simply wherever looks strong. HSE, for garages, says the same: check that the lifting points are right for that vehicle and "consult the vehicle manufacturer's handbook for guidance".⁵

10. Nothing on or under the jack. Toyota: "When raising the vehicle, do not put an object on or under the jack." Honda: "Do not put anything on top of or underneath the jack." Mazda: "Never place objects under the jack", because "The jack could slip and someone could be seriously injured by the jack or the falling vehicle."¹²³

11. Raise it only as far as the job needs. Toyota: "Raise the vehicle until the tire is slightly raised off the ground", and "Do not raise the vehicle to a height greater than that required to replace the tire." Honda: "until the tire is off the ground". Mazda sets the height by the spare, not the flat: "raise the vehicle high enough so that the spare tyre can be installed", and "Jacking up the vehicle higher than is necessary is dangerous as it could destabilize the vehicle resulting in an accident."¹²³ So the makers put the height a little differently, and your handbook's words are the ones to follow.

12. Nothing of you under the car. This is the callout's clause, and every handbook read says it. Toyota: "Do not put any part of your body under the vehicle while it is supported by the jack." Mazda: "No person should place any portion of their body under a vehicle that is supported by a jack." Honda: "never get under the vehicle when it is supported only by the jack", because "The vehicle can easily roll off the jack, seriously injuring anyone underneath."¹²³ Nissan, in its handbook for the 2024 LEAF sold in the US: "Never get under the vehicle while it is supported only by a jack."⁴ On this course's reading, "any part of your body" includes a hand reaching under to steady something, and a foot or a knee pushed under the sill.

13. Mind the brakes. Toyota: after driving, "the disc wheels and the area around the brakes will be extremely hot", and touching them "may result in burns."¹

14. Clean surfaces, and nuts the right way round. All three say to clean the wheel's mounting surface first. Honda: "Wipe the mounting surfaces of the wheel with a clean cloth." Toyota: if dirt is left there, "the wheel nuts may loosen while the vehicle is in motion". Mazda: "Do not apply oil or grease to wheel nuts and bolts", because "The wheel nuts could loosen while driving and cause the tyre to come off".¹²³ Toyota and Mazda have you fit each nut with its tapered or bevelled end facing inward.

15. Hand-tight, lower, then tighten in the handbook's order. Toyota and Mazda have you run the nuts on by hand, and Honda until they "touch the lips around the mounting holes"; all three then lower the car and tighten the nuts in the order their illustration shows. Toyota: "Firmly tighten each wheel nut two or three times in the order shown in the illustration." Honda: "Go around, tightening the nuts, two to three times in this order."¹²³ Toyota also says, "When lowering the vehicle, make sure that there is no-one near the vehicle."¹

16. Stow everything. Honda: "Loose items can fly around the interior in a crash and can seriously injure the occupants."²

The torque, and why this course prints no single figure

After the nuts are tightened with the wheel brace, Toyota wants a torque wrench (a different tool from the wheel brace, made to tighten a nut to a set figure), and soon: "Have the wheel nuts tightened with a torque wrench to 76 ft•lbf (103 N•m, 10.5 kgf•m) as soon as possible after changing wheels." It gives the reason in the same warning: failing to follow its precautions "could cause the wheel nuts to loosen and the tire to fall off, resulting in death or serious injury."¹ Honda gives 80 lbf·ft (108 N·m) for the Civic.² Mazda gives a range, 108 to 147 N·m (80 to 108 lbf·ft), and adds: "If you are unsure of how tight the nuts should be, have them inspected at an expert repairer".³

Lesson 1, "What a car is made of, and why the handbook comes first", put these side by side with Nissan's figure for the LEAF sold in the UK and made the point: several makers, several figures, and no reason given for any of them. That's why this course prints no single figure. A figure from a forum or a friend belongs to no car in particular.

Two things go wrong in the other direction. Honda: "Do not over tighten the wheel nuts by applying extra torque using your foot or a pipe." Mazda: "do not tighten the wheel nuts beyond the recommended tightening torque", because the nuts and bolts "could be damaged if tightened more than necessary".²³

Toyota's words set the deadline, "as soon as possible after changing wheels". On this course's reading, and for the reason lesson 1 gave (a page can't check a torque), the final torque is Call someone: a tyre fitter or a garage, on the way to having the flat tyre repaired, which lesson 18 said needs doing soon anyway. The RAC, which sells breakdown cover and repairs, suggests "giving the wheel nuts a final check for tightness", and Green Flag, which sells breakdown cover and repairs too, says to "Check them all twice".⁸⁹ Neither is a torque wrench.

Under the car: where this course stops

Toyota's handbook goes one step further than this course: "Use a jack stand if it is necessary to get under the vehicle."¹ Nissan's says, "If it is necessary to work under the vehicle, support it with safety stands."⁴ Those are the makers' steps. This course does not teach them, as its own scope decision, not because the work is unlawful: a page can't check a stand's footing or a car's support points. HSE's guidance for garages puts the principle in six words: "do not rely on jacks alone".⁵ At the roadside, with the car's own jack, the answer is simpler. Nothing of you goes under the car, at all.

What the injury figures show, and don't

The only injury study this course found is American and old. In 1998, NHTSA's statisticians published a four-page research note on injuries from "jack failures", which it defined as situations where "the vehicle is believed to have moved either as a result of the jack or car shifting, or as a result of the jack collapsing or losing pressure needed to hold the vehicle."⁶ It used the US Consumer Product Safety Commission's emergency-room injury data.

Here's what it found, and how far it goes. For one year, November 1994 to October 1995, it had "data from 102 cases", and from them it estimated that 4,822 people across the US were treated in hospital emergency rooms for injuries from a jack failure, in that sense, during some activity involving a motor vehicle. Of those, "Approximately three-fourths (74%) of the persons injured in motor vehicle jack failures were injured as a result of being struck by the vehicle as it fell from the jack." And by activity: "Another 913 (19%) persons were injured as they used the jack to lift the vehicle while attempting to change a tire."⁶

Its limits are these. It's an estimate scaled up from 102 cases. It counts people treated in hospital emergency rooms, and nobody else. Its data are over thirty years old. And the usual follow-up interviews weren't done: "funding limitations precluded this from being done in the present instance."⁶ So it is a picture of one year in the mid-1990s in one country, not a current rate. This course found no UK figure at all.

What it does show is where the harm comes from: the car coming down. HSE's page gives the workplace version: "Vehicles falling or rolling off incorrectly positioned jacks or stands, particularly where they are not chocked, are one of the main causes of fatal accidents in motor vehicle repair (MVR)." One of its examples is a roadside recovery: a fitter "crushed to death under the air-lifted axle of a tractor unit they were attempting to rescue from the roadside. No supplementary supports were used."⁵ That was a lorry, not a car, and a trade job, not an owner's. The mechanism is the same one every handbook's jack warning is about.

A wheel change in a Hornsea lay-by

Now a case worked through. A driver's Mazda3 gets a slow puncture in the nearside rear tyre (the left, the side away from the traffic) on a quiet local road out of Hornsea on a dry afternoon. Hers carries the temporary spare and a jack; the handbook says a Mazda3 "may or may not be equipped with a spare tyre, jack, wheel brace, and tool bag".³ A lay-by, set well back from the carriageway with a hard, level surface, is a few hundred metres on.

Whether. Not a motorway or other fast road. The lay-by is off the road, hard and level. The flat is on the nearside, so she won't be between the car and the traffic while she works. The Mazda3's handbook gives the method. Every condition is met, so it's Yours, on conditions.

The preparation. Parking brake on; P, since it's an automatic; switched off as the handbook describes; hazard lights on. Her passenger gets out and waits well away from the car and the road. She takes the spare, jack and tools from the boot.

The chock. The flat is rear left, so the diagonal wheel is front right. Mazda wants a block in front of it and behind it. She has no chocks, so she uses two stones from the edge of the lay-by, each big enough to hold the tyre, as Mazda allows.

The nuts. With the wheel on the ground, a turn each, anticlockwise. None comes off yet.

The jack. At the rear jack-up position the handbook's drawing shows, nothing under it, raised high enough for the spare to go on, as Mazda puts it, and no higher. She keeps her hands and knees out from under the car throughout.

The swap. Nuts off, wheel off, the mounting surfaces wiped, spare on, nuts on by hand with the bevelled edge inward. Car lowered with nobody beside it. Nuts tightened in the order the handbook's drawing shows.

After. Stones moved, tools stowed. The spare's speed limit is 80 km/h (50 mph) in Mazda's words; lesson 18 has what the law in Great Britain adds. And straight to a tyre fitter, both to have the puncture seen to and to have the nuts checked with a torque wrench against Mazda's range.

A harder one

Now one with a gap. A driver has a flat front tyre at dusk on a country road. The only place off the road is a soft grass verge with a slight slope. There's no chock in the car and nothing solid in sight. When she tries the first wheel nut with the brace, it won't move.

A Chico driveway, and the US handbook

One US case, briefly. A 2023 Corolla has a flat in a level concrete driveway in Chico. Everything in the place check passes, and there is no traffic to stand between. The owner follows Toyota's pages 370 to 378 (the chock on the diagonal wheel, the nuts loosened a turn, the jack at its point, the tyre raised "slightly" off the ground), and afterwards has the nuts set to Toyota's 76 lbf·ft (103 N·m) with a torque wrench, as the handbook says, "as soon as possible". The compact spare then carries Toyota's own limit of 50 mph (80 km/h), and its pressure isn't watched by the car's warning system, as lesson 18 showed.

What people get wrong

"A plank under the jack makes it steadier." The RAC, which sells breakdown cover and repairs, says "Placing a small plank of wood under the jack will help keep it stable."⁸ All three handbooks re-read here forbid anything under the jack, and Mazda says why: the jack could slip. For your car, the handbook governs.

"A quick look underneath is fine." Not while it's on the jack. "Any part of your body", in Toyota's words, and Mazda's "any portion of their body".

"Tighten them as hard as you can." Honda forbids extra force by foot or pipe, and Mazda says too much can damage the nuts and bolts. The handbook's figure, with a torque wrench.

"Any strong-looking point will take the jack." Honda: "Use only at the jacking points." Mazda: other positions could let the car "slip off the jack", and could "deform the vehicle body".³

"It's in P with the handbrake on, so it can't move." Mazda: without wheel blocks the car "may move and fall off the jack even with" the lever in P.

Practice

For your plan

Add the wheel change to the wheel page lesson 18 started: the handbook's section and pages, the jack warning in its words, where the jacking points and tools are, the torque, and your three good places and one bad one.

Connections

Lesson 18 made the decision this lesson carries out. Lesson 1 set the torque spread, and lesson 16, "When the car stops: where, who stands where, and the call", the places of relative safety this lesson's conditions build on. Lesson 13 applied these placement rules to a jump start. Tools in general, and eye protection, are Home Repair and Maintenance lesson 13's, "Tools, dust and fumes: a small kit used safely"; axle stands aren't taught in either course. Lesson 20, "The law on a car's condition: Great Britain and Northern Ireland", begins the law.

Go deeper

• Your own handbook, its wheel-change pages. Read three here in full; yours is the one with your car's jacking points and torque.
• HSE, "Working under vehicles", free. Read here in full. Written for garages, but its list of incidents shows why the jack clause is absolute.
• NHTSA, "Injuries Associated With Hazards Involving Motor Vehicle 'Jack Failures'" (1998), free PDF. Read here in full. Four pages, and a good lesson in what a small, old study can and can't tell you.

Sources

1. Toyota, 2023 Corolla Owner's Manual (OM02568U), US market, section 7-2 "Steps to take in an emergency". A maker's handbook for its own car. Read: pp. 370 to 379, re-read 26 September 2026.
2. Honda, 2024 Civic Sedan Owner's Manual, "Changing a Flat Tire", online, US market. A maker's handbook for its own car. Read: full section, re-read 26 September 2026.
3. Mazda, Mazda3 Owner's Manual, "Flat Tyre", online, European English edition (8GD7-EE-17H). A maker's handbook for its own car. Read: every page of the chapter, re-read 26 September 2026.
4. Nissan North America, 2024 LEAF Owner's Manual and Maintenance Information, US market. A maker's handbook for its own car. Read for this lesson: p. 8-2, "Maintenance precautions", 26 September 2026.
5. Health and Safety Executive, "Working under vehicles", motor vehicle repair pages. Great Britain's workplace safety regulator; guidance written for workplaces. No date shown. Read: full page, re-read 26 September 2026.
6. NHTSA, National Center for Statistics and Analysis, Research Note, "Injuries Associated With Hazards Involving Motor Vehicle 'Jack Failures'", September 1998. US. A scanned PDF. Read: all four pages, by this course's own OCR checked against the scan, 26 September 2026.
7. The Highway Code, "Breakdowns and incidents (275 to 287)", updated 14 September 2021. Great Britain. Read: full text, re-read 26 September 2026 through the GOV.UK content API.
8. RAC (a UK motoring organisation that sells breakdown cover and repairs; not an official body), "How to change a tyre in 10 simple steps". No date shown. Read: full article, re-read 26 September 2026.
9. Green Flag (a UK breakdown provider; not an official body), "Changing a tyre". No date shown. Read: full article, re-read 26 September 2026.