Custom forged wheels for BMW Z4 G29 (2018-present)

Technical specifications

Production period: 2018-present

Original fitment measurements: BMW Z4 G29

The measurements of the car as delivered new, to identify yours and compare. Each value refers, by a number, to the sources that give it. They are not a recommendation: Onyx does not advise any specific offset.

Hub

Measurement	Original value
PCD (bolt pattern)	5x112^{[1, 2, 3, 4]}
Centre bore	66.6 mm^{[1, 2, 3, 4]}
Thread	M14 x 1.25^{[1, 2, 3, 4]}
Fixing	Wheel bolts^{[1, 2, 3, 4]}
Bolt or nut seat	Not published
Tightening torque	140 Nm^{[1, 3, 4]}

“Not published”: no source gives it with the certainty we require at this stage (see the rule below).

Original fitments by version

Version and fitment	Front				Rear
Version and fitment	Diameter	Width	Original offset (manufacturer)	Tyre	Diameter	Width	Original offset (manufacturer)	Tyre
Z4 M40i, 250 kW, 19 inches, original equipment	19″^{[5, 6, 7]}	9J^{[5, 6, 7]}	ET 32^{[5, 6, 7]}	255/35 R19^{[5, 6, 7]}	19″^{[5, 6, 7]}	10J^{[5, 6, 7]}	ET 40^{[5, 6, 7]}	275/35 R19^{[5, 6, 7]}
Z4 M40i, 250 kW, 18 inches, original equipment	18″^{[5, 6, 7]}	9J^{[5, 6, 7]}	ET 32^{[5, 6, 7]}	255/40 R18^{[5, 6, 7]}	18″^{[5, 6, 7]}	10J^{[5, 6, 7]}	ET 40^{[5, 6, 7]}	275/40 R18^{[5, 6, 7]}
Z4 M40i, 250 kW, 18 inches, winter tyres, original equipment (winter tyres)	18″^{[5, 6, 7]}	8.5J^{[5, 6, 7]}	ET 30^{[5, 6, 7]}	255/40 R18^{[5, 6, 7]}	18″^{[5, 6, 7]}	9J^{[5, 6, 7]}	ET 32^{[5, 6, 7]}	255/40 R18^{[5, 6, 7]}
Z4 sDrive20i (145 kW) and sDrive30i (190 kW), 19 inches, original equipment	19″^{[8, 9, 10, 11, 12, 13]}	9J^{[8, 9, 10, 11, 12, 13]}	ET 32^{[8, 9, 10, 11, 12, 13]}	255/35 R19^{[8, 9, 10, 11, 12, 13]}	19″^{[8, 9, 10, 11, 12, 13]}	10J^{[8, 9, 10, 11, 12, 13]}	ET 40^{[8, 9, 10, 11, 12, 13]}	275/35 R19^{[8, 9, 10, 11, 12, 13]}
Z4 sDrive20i (145 kW) and sDrive30i (190 kW), 18 inches, 9J and 10J, original equipment	18″^{[8, 9, 10, 11, 12, 13]}	9J^{[8, 9, 10, 11, 12, 13]}	ET 32^{[8, 9, 10, 11, 12, 13]}	255/40 R18^{[8, 9, 10, 11, 12, 13]}	18″^{[8, 9, 10, 11, 12, 13]}	10J^{[8, 9, 10, 11, 12, 13]}	ET 40^{[8, 9, 10, 11, 12, 13]}	275/40 R18^{[8, 9, 10, 11, 12, 13]}
Z4 sDrive20i (145 kW) and sDrive30i (190 kW), 18 inches, 8J and 9J, original equipment	18″^{[8, 9, 10, 11, 12, 13]}	8J^{[8, 9, 10, 11, 12, 13]}	ET 20^{[8, 9, 10, 11, 12, 13]}	225/45 R18^{[8, 9, 10, 11, 12, 13]}	18″^{[8, 9, 10, 11, 12, 13]}	9J^{[8, 9, 10, 11, 12, 13]}	ET 28^{[8, 9, 10, 11, 12, 13]}	255/40 R18^{[8, 9, 10, 11, 12, 13]}
Z4 sDrive20i (145 kW) and sDrive30i (190 kW), 17 inches, original equipment	17″^{[8, 9, 11]}	7.5J^{[8, 9, 11]}	ET 24^{[8, 9, 11]}	225/50 R17^{[8, 9, 11]}	17″^{[8, 9, 11]}	8.5J^{[8, 9, 11]}	ET 26^{[8, 9, 11]}	255/45 R17^{[8, 9, 11]}
Z4 sDrive20i (145 kW) and sDrive30i (190 kW), 18 inches, winter tyres, original equipment (winter tyres)	18″^{[8, 9, 10, 11, 12, 13]}	8.5J^{[8, 9, 10, 11, 12, 13]}	ET 30^{[8, 9, 10, 11, 12, 13]}	255/40 R18^{[8, 9, 10, 11, 12, 13]}	18″^{[8, 9, 10, 11, 12, 13]}	9J^{[8, 9, 10, 11, 12, 13]}	ET 32^{[8, 9, 10, 11, 12, 13]}	255/40 R18^{[8, 9, 10, 11, 12, 13]}

The offsets are the original ones, given by the manufacturer or by the sources cited; they help you identify your car's fitment.

What Onyx can make for the BMW Z4 G29

Custom forged wheels in forged 6061-T6 aluminium, designed to JWL/VIA standards, in monoblock or two-piece construction; three-piece wheels are made on quotation.

The diameters below start at the smallest original diameter recorded on this car (17″) and go up to 24″.

Diameter	Monoblock, set of four wheels	Two-piece, set of four wheels
18″	€3,200 Great Britain: £3,336 with UK import VAT	€4,300 Great Britain: £4,482 with UK import VAT
19″	€3,200 Great Britain: £3,336 with UK import VAT	€4,300 Great Britain: £4,482 with UK import VAT
20″	€3,300 Great Britain: £3,440.40 with UK import VAT	€4,400 Great Britain: £4,586.40 with UK import VAT
21″	€3,550 Great Britain: £3,700.80 with UK import VAT	€4,750 Great Britain: £4,951.20 with UK import VAT
22″	€3,750 Great Britain: £3,908.40 with UK import VAT	€5,200 Great Britain: £5,420.40 with UK import VAT
23″	€3,950 Great Britain: £4,117.20 with UK import VAT	€5,750 Great Britain: £5,992.80 with UK import VAT
24″	€4,100 Great Britain: £4,273.20 with UK import VAT	€6,300 Great Britain: £6,566.40 with UK import VAT

Amounts in pounds: our checkout on 4 October 2026, before the carrier's clearance fee and any import duty. The amount shown at checkout is the one charged for your order.

Wheels delivered in 4 to 8 working weeks, shipping included, from full payment for an order on the website, or from the deposit for an order on quotation, and at the earliest from your approval of the measurements, the colour or the 3D render you asked for, under article 5.1 of the Terms and Conditions.

The offset and width of your wheels do not come from a table: the Onyx Forged design office calculates them for your car and your brakes, and submits them to you before machining.

Configure wheels for the BMW Z4 G29

Frequently asked questions: wheels for the BMW Z4 G29

What are the original offsets for the wheels of a BMW Z4 G29?

A staggered fitment, according to its Swiss vehicle type records: 9J with an offset of 32 at the front and 10J with an offset of 40 at the rear, in both 18 and 19 inches; on the sDrive20i and sDrive30i, also 8J x 18 with an offset of 20 at the front and 9J x 18 with an offset of 28 at the rear.^{[5, 8, 13]}

Which tyres, and which load index, does a BMW Z4 G29 take?

In 19 inches, 255/35 R19 with load index 96 at the front, i.e. 710 kg per tyre, and 275/35 R19 with load index 100 at the rear, i.e. 800 kg; in 18 inches, 255/40 R18 with load index 95 and 275/40 R18 with load index 99, i.e. 690 and 775 kg.^{[5, 7, 14]}

What is the load per wheel on a BMW Z4 G29?

The M40i's Swiss vehicle type record gives it a permissible load of 865 kg on the front axle and 995 kg on the rear axle, i.e. 432.5 and 497.5 kg per wheel: on this rear-wheel-drive roadster, the rear carries the most. The 275/35 R19 rear tyre with load index 100 carries 800 kg.^{[5, 14]}

What PCD, centre bore and bolts does a BMW Z4 G29 use?

The PCD is 5x112, the centre bore 66.6 mm, and the wheels are held by M14 x 1.25 bolts tightened to 140 Nm: wheelfitment.eu, koleso.ee and SCC give these measurements (SCC gives no torque).^{[1, 2, 3, 4]}

Same fixing measurements

As original equipment, these cars have the same PCD, centre bore, thread and fixing as the BMW Z4 G29: PCD 5x112, centre bore 66.6 mm, thread M14 x 1.25, fixing: wheel bolts.

BMW i4 M50 (G26) (2021–2025)
BMW M2 G87 (since 2023)
BMW M240i G42 (since 2021)
BMW M340i G20 and G21 (since 2019)
BMW M440i G22 and G23 (since 2020)
BMW M5 F90 (2017–2023)
BMW 1 Series F40 (2019–2024)
BMW 3 Series G20 (since 2019)
BMW X3 M F97 (2019–2024)
BMW X4 M F98 (2019–2025)
BMW X5 G05 (since 2018)
MINI Cooper F56 (2014–2024)

Same fixing measurements; original diameters and offsets: see each car's page. The seat of the bolts or nuts, the width of the wheels and brake clearance are not compared here: this comparison is not an opinion on compatibility.

Sources for the measurements and answers

koleso.ee, BMW Z4 G29 [2018 .. 2022], 145, 190 and 250 kW (secondary source, consulted on 21 October 2026)
SCC Fahrzeugtechnik (spurverbreiterung.de), BMW Z4, type G29, 2019 onwards (secondary source, consulted on 21 October 2026)
wheelfitment.eu, BMW Z4 G29 (2018 - ) (secondary source, consulted on 21 October 2026)
koleso.ee, BMW Z4 G29 Facelift [2022 .. ], 145, 190 and 250 kW (secondary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. 1BN837 (BMW Z4 M40i, type G4Z (HF51), 250 kW, November 2018): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. 1BR684 (BMW Z4 M40i, type G4Z (HF51), 250 kW, June 2020): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. ABA363 (BMW Z4 M40i, type G4Z (HF51), 250 kW, October 2022): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. 1BN841 (BMW Z4 sDrive20i, type G4Z (HF11), 145 kW, November 2018): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. 1BV285 (BMW Z4 sDrive20i, type G4Z (HF11), 145 kW, January 2021): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. ABA365 (BMW Z4 sDrive20i, type G4Z (HF11), 145 kW, October 2022): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. 1BN843 (BMW Z4 sDrive30i, type G4Z (HF31), 190 kW, November 2018): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. 1BR688 (BMW Z4 sDrive30i, type G4Z (HF31), 190 kW, June 2020): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Swiss Federal Roads Office (ASTRA), vehicle type record no. ABA368 (BMW Z4 sDrive30i, type G4Z (HF31), 190 kW, October 2022): permitted tyre and wheel combinations (tyre, width x diameter, offset) and axle loads (primary source, consulted on 21 October 2026)
Fiches-auto.fr, tyre load index table (index → kg) (reference table, for a conversion, consulted on 3 October 2026)

Publication rule: a measurement is shown only if a primary source gives it (a manufacturer's document, an official vehicle type record, an original parts catalogue, the maker of the original wheel) without another primary source contradicting it, or if two independent specialist sources agree without a primary source contradicting them. The press and forums do not count. Measurements checked on 21 October 2026 by the Onyx Forged design office.

Designs for this generation

Three models from our catalogue, forged to measure for your BMW Z4 G29. The price is for a set of four wheels: it depends on the construction and the diameter.

Amounts in pounds: our checkout on 4 October 2026, before the carrier's clearance fee and any import duty. The amount shown at checkout is the one charged for your order.

Find my wheel · All 24 designs in the catalogue

See these wheels on your car

Custom forged wheels for the BMW Z4 G29

Forged 6061-T6 aluminium
5-axis CNC machining
Designed to JWL/VIA standards
Fitment worked out for your BMW Z4 G29

Z4 G29: 5x112, a 66.6 mm hub, M14 x 1.25 bolts

The third-generation BMW Z4 (G29), whose first Swiss vehicle type records date from November 2018, in sDrive20i, sDrive30i and M40i form, is 5x112 on a 66.6 mm hub, with M14 x 1.25 wheel bolts tightened to 140 Nm: wheelfitment.eu, koleso.ee and SCC give these measurements, each cited in the table (SCC gives no torque).

A staggered fitment, from 17 to 19 inches

The vehicle type record of the Swiss Federal Roads Office (ASTRA), the document that sets the tyre and wheel combinations a car may carry, permits for the Z4 a staggered fitment: 9J with an offset of 32 at the front and 10J with an offset of 40 at the rear, in 19 inches (255/35 R19 and 275/35 R19) as well as in 18 inches (255/40 R18 and 275/40 R18), on all three versions. The sDrive20i and sDrive30i also take, in 18 inches, 8J with an offset of 20 at the front and 9J with an offset of 28 at the rear, and their records from 2018 to 2021 permit a 17-inch wheel: 7.5J with an offset of 24 at the front, 8.5J with an offset of 26 at the rear. For winter, the record permits 8.5J x 18 with an offset of 30 at the front and 9J x 18 with an offset of 32 at the rear.

A rear-wheel-drive roadster: the rear carries the most

The M40i's record gives a permissible load of 865 kg on the front axle and 995 kg on the rear axle, i.e. 432.5 and 497.5 kg per wheel. That is the load the rear wheel must carry, and the rear tyre must keep at least the load index of the original fitment (reading a tyre (page in French)).

What these measurements say about a forged wheel

The offset positions the wheel in the wheel arch: a wider wheel, or a lower offset, brings it closer to the wing. The Onyx Forged design office starts from the measurements on this page, your brakes and your tyres to calculate the width and offset of your wheels, then submits them to you. The offset calculator compares two fitments: it compares, it does not choose the measurement for you.

Roadworthiness test: what is examined

The French roadworthiness test (contrôle technique) examines the wheel without removing it (cracks, deformation, a wheel that protrudes beyond the bodywork) and verifies that the tyre size is one provided for by the manufacturer or accepted as equivalent. Keeping a tyre size from the original fitment, and at least its load index, avoids having to justify it; the details are on the roadworthiness test and registration page.

What we record before machining

The exact version, stated on the registration document, and the current diameter of your wheels.
The braking system, on which the smallest possible diameter depends (wheels and brakes (page in French)).
The current fitment, axle by axle, and the 66.6 mm hub bore.

Configure your forged wheels for the BMW Z4 (G29)

The Onyx Forged design office works out the measurements of your car from its exact version, stated on the registration document, and shows them to you before machining. Each set is cut from forged 6061-T6 aluminium, machined on a 5-axis CNC centre, as monoblock, two-piece or three-piece wheels; our wheels are designed to JWL/VIA standards. Prices by diameter and the lead time are given on this page, under “What Onyx can make”. Start your configuration or write to contact@onyxforgedwheels.com.

Configure custom wheels for your BMW Z4 G29: free 3D render, on request.

Useful guides

See all generations of the BMW Z4, or all BMW models.