Three cars, one bolt pattern, and one number that changed
The Mazda3, the CX-30 and the CX-5 all run 5x114.3 on a 67.1 mm hub with M12 x 1.5 studs and 60-degree cone-seat lug nuts. That is convenient, and it is also the trap, because a wheel that bolts on is not the same thing as a wheel that fits.
Mazda changed the factory offset partway through both the Mazda3 and the CX-5. The bolt pattern did not change, the hub bore did not change, so a set off the older car will thread up on the newer one and sit five millimetres out of position. Nothing will warn you. That is the single most common fitment mistake we see on these three vehicles.
One honest caveat before the tables. Mazda does not publish wheel offset in any document we could find. The owner's manuals and the spec decks give wheel size and tire size and stop there. The offsets below come from OEM-replacement wheel catalogues at part-number level, cross-checked against fitment databases, and they are consistent across sources. They are not, strictly, Mazda's own published figures, and we would rather say so than imply a precision that does not exist.
Mazda3
| Generation | Years | Wheel | Offset | Tire |
|---|---|---|---|---|
| BM / BN | 2014-2018 | 16 x 6.5J | ET50 | 205/60R16 |
| BM / BN | 2014-2018 | 18 x 7J | ET50 | 215/45R18 |
| BP | 2019-present | 16 x 6.5J | ET45 | 205/60R16 |
| BP | 2019-present | 18 x 7J | ET45 | 215/45R18 |
There is no factory 17-inch or 19-inch Mazda3 in this market. If you have seen those sizes listed, they belong to European or Japanese cars.
The 2.5 Turbo gets no unique wheel. It runs the same 18 x 7J ET45 as any other 18-inch BP Mazda3. What it does get is the all-wheel-drive car's larger 295 mm front rotor instead of the front-driver's 280 mm. That matters less than people expect, because Mazda still ships a 16-inch temporary spare with the all-wheel-drive cars, which is a manufacturer's own confirmation that 16-inch wheels clear that brake. Sixteen-inch winter wheels on a Mazda3 Turbo are fine.
CX-30
| Years | Wheel | Offset | Tire |
|---|---|---|---|
| 2020-present | 16 x 6.5J | ET45 | 215/65R16 |
| 2020-present | 18 x 7J | ET45 | 215/55R18 |
The CX-30 has run one offset since launch, which makes it the simplest of the three. The caution here is the Turbo. Mazda USA's spec deck gives the Turbo a larger front rotor than the naturally aspirated car, and the Turbo is never offered from the factory with 16-inch wheels. Mazda Canada's own sheet disagrees with the US document on those brake sizes, which is an unusual thing for two manufacturer documents to do, and we have not been able to resolve it. Practical position: we will not sell you a 16-inch winter package for a CX-30 Turbo without test-fitting it first.
CX-5
| Generation | Years | Wheel | Offset | Tire |
|---|---|---|---|---|
| KE | 2013-2016 | 17 x 7J | ET50 | 225/65R17 |
| KE | 2013-2016 | 19 x 7J | ET50 | 225/55R19 |
| KF | 2017-2025 | 17 x 7J | ET45 | 225/65R17 |
| KF | 2017-2025 | 19 x 7J | ET45 | 225/55R19 |
The CX-5 has a brake catch that the Mazda3 does not. From the 2021 model year on the Grand Touring, GT Reserve and Signature, and from 2022 on every 19-inch trim whether turbocharged or not, the front rotor grows from 297 mm to 320 mm. Seventeen inches is the practical minimum diameter on any of those cars. Whether a 16-inch wheel clears that 320 mm brake is genuinely unresolved in the sources, and Mazda's own spec decks contradict each other on which spare ships with those trims. We assume it does not clear and quote 17-inch minimum.
The offset change is the thing to get right
Mazda3 went from ET50 to ET45 at the 2019 generation break. CX-5 went from ET50 to ET45 at the 2017 break. Five millimetres does not sound like much and in isolation it is not, but it stacks with whatever the aftermarket wheel does. A set of ET40 wheels on a 2016 CX-5 is ten millimetres further out than factory, not five.
The general guidance from owners of these cars is to stay inside roughly five millimetres of the factory offset and ideally closer than that before steering feel and bump steer start to change. That is a reasonable place to begin, and it is why we ask for the year rather than just the model.
What actually fits
On all three cars, the constraint people expect is the fender and the constraint that actually bites is the front strut. A wide wheel with a high offset pulls the barrel inboard toward the strut body, and that is where it touches. This is reported independently by retailers and by owners on the BP Mazda3 and the CX-30, and CX-5 owners report the factory 225/55R19 already leaving witness marks on the front struts on some cars.
The workable band across all three is roughly ET40 to ET50 on a 7.5 to 8.0 inch wheel. Inside that, the reported real-world fitments are:
- Mazda3 BM. 18x8 around ET40 clears with no fender work. 18x8.5 ET35 needs lowering and rolled fenders. 19x8.5 ET35 fits but rubs at full lock.
- Mazda3 BP. 17 to 19 inch, 8.5 inch wide, ET35 to ET45, with strut clearance as the limit rather than the arch.
- CX-30. ET35 to ET48 works. 18x8 ET45 on a 235/50R18 is confirmed with no rubbing, though the rear tires sit close to the struts.
- CX-5 KF. 19x7.5 ET45 on 245/50R19 and 255/50R19 are both proven. 19x8 and 19x8.5 at ET45 on a 245/50R19 are reported clean. Keep overall diameter within about half an inch of stock.
Those are owner and retailer reports, not manufacturer data, and we are labelling them as such deliberately. We could not find a wheel manufacturer fit-check tool that publishes Mazda-specific offset ranges, which is worth knowing if you are shopping online and a site tells you a wheel is guaranteed to fit.
The 67.1 mm bore is small, and it matters
Most aftermarket wheels are machined to a 73.1 mm centre bore so that one wheel can serve several platforms. Mazda's hub register is 67.1 mm. That six-millimetre gap means the wheel is not locating on the hub at all unless you fit hub-centric rings, and the lug nuts are being asked to centre the wheel as well as clamp it.
This is the number one cause of the complaint that starts "I put new wheels on and now it vibrates at highway speed." It is not the balance and it is not the tires. Hub-centric rings on these three cars are not optional in our view, and we fit them as a matter of course.
TPMS flips mid-model, and this is the winter wheel trap
This catches people every autumn, because the answer changed without the car changing much.
- Mazda3 2014-2018. Indirect TPMS. There are no sensors in the wheels at all. The system reads wheel speed from the ABS sensors. A winter wheel set needs no TPMS hardware whatsoever, but the system has to be re-initialised with the SET button after fitting and after any pressure change.
- Mazda3 2019 and newer. Direct TPMS at 315 MHz. Every wheel needs a sensor.
- CX-5 2013-2016. Indirect. No sensors.
- CX-5 2017 and newer. Direct, 315 MHz. Sensors required.
- CX-30. Direct from launch. Sensors required.
Quoting a sensor-free winter package on a 2017 CX-5 because a 2016 did not need them is exactly how this goes wrong. We supply and fit TPMS sensors in-house, and we check which system the car has before we quote rather than after.
Lug nuts and torque
All three use lug nuts on pressed-in studs, not bolts. M12 x 1.5, 60-degree acorn seat, 21 mm hex. Many aftermarket wheels come with nuts that have the correct seat but the wrong hex size for a recessed lug pocket, so check that the socket actually reaches.
Mazda's own owner's manuals give a torque range of 108 to 147 Nm, which is 80 to 108 ft-lb, and that same range appears in four different Mazda manuals across all three models. Mazda does not narrow it to a single figure and neither will we. The numbers you will see quoted on retailer sites are their numbers, not Mazda's. Use the manual in your glovebox.
Wheels that suit these cars
All three are ET45-ish cars on a small bore with limited strut clearance, which rules out a lot of the aggressive fitment catalogue and leaves a good range of sensible flow-formed wheels. Konig makes several that land in the right band in 5x114.3, including the Hypergram, the Dekagram, the Ampliform and the Countergram. Fast Wheels, Braelin, Enkei, TSW and Motegi all have models in the size and offset range these cars want.
We are not going to tell you which one to buy. What we will do is check the exact size and offset against your specific year before anything is ordered, because on these cars the year is the variable that matters.
All specifications above are North American market only. Cars imported privately from Japan or Europe run different fitments, and the European CX-30 in particular is offered in sizes that were never sold here.
Confirm the fitment with us before you order. Send us the year, model, trim and whether it is front-wheel or all-wheel drive, and we will check it against the wheel you are looking at.
Wheels we can actually put on these cars
All three of these are 5x114.3 wheels we stock and can order, and all three come in the diameter and offset band these cars want. Remember the small 67.1 mm bore: whichever wheel you choose, it gets hub-centric rings.
Konig Dekagram. Ten thin spokes that fork near the rim. A light flow-formed wheel and one of the more conservative-looking options, which suits a car that came with a 7-inch factory wheel. Available in 5x114.3 among several other patterns, so confirm the drilling as well as the size.
Konig Countergram. Thin spokes with a machined outer lip. The exposed lip is worth a thought on a car that lives in Victoria: it looks good and it is the first thing a curb finds, so if you park tight to concrete regularly, weigh that.
Konig Myth. Five split spokes reading as ten tips. A larger-looking face than the Dekagram at the same diameter, which suits the CX-5 and CX-30 better than it suits a Mazda3 sedan. Also offered in 5x114.3.
These are three of many. The website lists a fraction of what we can order, so if you have found something elsewhere, send us the model and the size and we will check it against your year.
About SHC Auto
We have been fitting wheels and tires in Victoria since 1991, out of the same shop at 474 Bay Street. Alongside wheels and tires we do window tint, paint protection film, vinyl wraps, ceramic coating, paint correction and detailing, suspension, caliper painting, chrome delete, and vehicle graphics and signage. We also do the things most shops send out: tint removal, curb rash repair and wheel refinishing, TPMS sensor supply and fitting, and re-torque after install.
The catalogue on our website is a fraction of what we can actually order. We are an authorized dealer for more than three hundred aftermarket brands, and a good number of them never made it onto the site because there is no data feed for them. If you cannot find something, ask us rather than assuming we cannot get it.
SHC Autographx and Tires
474 Bay Street, Victoria, BC
Monday to Friday, 9:00 to 5:30. Closed weekends.
Free shipping anywhere on Vancouver Island.
Getting a real answer on your car. Tell us the year, model and trim and what you are trying to achieve, and we will come back with sizes that work and what they cost fitted, balanced and with hub rings.