Why choose hubcentric BMW G chassis wheel spacers over non-hubcentric alternatives?

Hubcentric BMW G chassis wheel spacers center the wheel on the hub bore — not the wheel bolts. The MMX spacers are machined with a 66.5mm center bore that matches the G-chassis hub diameter exactly, ensuring correct load distribution and eliminating the vibration at speed associated with non-hubcentric fitment, which leaves a gap between the spacer bore and the hub.

Why do these BMW G chassis wheel spacers also fit the Toyota GR Supra?

The A90/A91 GR Supra shares the same 5x112 bolt pattern and 66.5mm center bore as the G-chassis BMW range — a result of the Supra's BMW-co-developed Z4 platform. These spacers are a direct fitment for both vehicles without any modification or adapter.

What width should I choose?

12mm (24mm per axle) suits a subtle flush fitment on most G-chassis models. 15mm (30mm per axle) is the most popular choice for an aggressive flush or slightly proud stance. 18mm (36mm per axle) is suited to pronounced stance builds or where additional caliper clearance is needed. Check your current offset and measure arch liner clearance at full lock before ordering.

Are extended wheel bolts included?

Yes. Each pair of MMX BMW G chassis wheel spacers includes ten extended-length grade 10.9 carbon steel black wheel bolts, correctly sized for the spacer thickness. Grade 10.9 exceeds OEM specification — this is a critical safety requirement that many budget kits omit.

What is the difference between these and the F-chassis spacers?

The G-chassis spacers use a 5x112 bolt pattern and 66.5mm center bore, matching the G20/G22/G80/G82 and GR Supra. The F-chassis spacers use a 5x120 bolt pattern and 72.6mm center bore, matching the F20/F30/F80 and earlier BMW generations. The two sets are not interchangeable.

Description

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Description

MMX Hubcentric Wheel Spacers for BMW G-Chassis Models and Toyota GR Supra (12mm, 15mm, 18mm)

BMW G chassis wheel spacers from MMX Performance are hubcentric, precision-machined from aerospace-grade 7075-T6 aluminum, and available in 12mm, 15mm, or 18mm widths to suit G-chassis BMW models from the 3 Series through to the M3, M4, M8, and Z4, as well as the A90/A91 Toyota GR Supra which shares the same 5×112 / 66.5mm hub specification. The hubcentric design incorporates a CNC-machined 66.5mm center bore that matches the G-chassis and GR Supra hub diameter exactly, ensuring the wheel is centered on the hub rather than the bolts eliminating the vibration risk that comes from non-hubcentric fitment and ensuring correct load distribution at all speeds. 7075-T6 aluminum delivers significantly higher tensile strength than the 6000-series alloys used in most aftermarket spacers, with less weight and greater resistance to deformation under sustained lateral loads the correct specification for a structural component in this role. Each pair comes complete with ten extended-length grade 10.9 carbon steel black wheel bolts for immediate safe fitment, and the black anodized finish prevents hub bonding while machined cutouts allow clean removal after extended use. Available in 12mm (24mm per axle), 15mm (30mm per axle), or 18mm (36mm per axle).

Why Hubcentric?

The MMX BMW G chassis wheel spacers are engineered with a precision-machined alloy spigot that provides accurate wheel alignment and full engagement with the vehicle hub. This ensures correct load distribution, minimizes vibration risk, and enhances stability at all speeds. For performance applications, non-hubcentric spacers are not advised.

Features

Hubcentric design with precision-machined 66.5mm center bore for vibration-free fitment
Aerospace-grade 7075-T6 aluminum — stronger and lighter than 6000-series alternatives
Available in 12mm, 15mm, and 18mm widths
Black anodized finish resists corrosion and prevents hub bonding
Machined rear cutouts for clean removal after extended use
Increases track width for improved stability and cornering response
Creates clearance for larger brake calipers or suspension components
Flush, aggressive fitment within the wheel arch
Laser-etched MMX branding

Applications

BMW 3 Series: G20, G21, G28 | 2019-present
BMW 4 Series: G22, G23, G26 | 2021-present
BMW 5 Series: G30, G31, G38 | 2017-2023
BMW 6 Series: G32 | 2017-2023
BMW 7 Series: G11, G12 | 2016-2022
BMW 8 Series: G14, G15, G16 | 2019-present
BMW M3: G80 | 2021-present
BMW M4: G82, G83 | 2021-present
BMW M8: F91, F92, F93 | 2019-present
BMW X3: G01 | 2018-2024
BMW X4: G02 | 2018-present
BMW Z4: G29 | 2018-present
Toyota GR Supra: A90, A91 | 2020-present

Care and Maintenance

Use only pH-balanced, non-abrasive cleaners. Avoid acidic or alkaline products
Wash with mild soap and water only. Do not use solvent-based or abrasive chemicals
Avoid commercial car washes that use harsh chemicals such as traffic film remover (TFR)
Before installation, ensure the spacer sits flat against the hub and wheel, and check wheel arch clearance at full left and right lock

Notes

Sold as a pair
This item is non-returnable
Images are generic; actual product may vary

Frequently Asked Questions

Why choose hubcentric BMW G chassis wheel spacers over non-hubcentric alternatives? Hubcentric BMW G chassis wheel spacers center the wheel on the hub bore not the wheel bolts. The MMX spacers are machined with a 66.5mm center bore that matches the G-chassis hub diameter exactly, ensuring correct load distribution and eliminating the vibration at speed associated with non-hubcentric fitment, which leaves a gap between the spacer bore and the hub.
Why do these BMW G chassis wheel spacers also fit the Toyota GR Supra? The A90/A91 GR Supra shares the same 5×112 bolt pattern and 66.5mm center bore as the G-chassis BMW range a result of the Supra’s BMW-co-developed Z4 platform. These spacers are a direct fitment for both vehicles without any modification or adapter.
What width should I choose? 12mm (24mm per axle) suits a subtle flush fitment on most G-chassis models. 15mm (30mm per axle) is the most popular choice for an aggressive flush or slightly proud stance. 18mm (36mm per axle) is suited to pronounced stance builds or where additional caliper clearance is needed. Check your current offset and measure arch liner clearance at full lock before ordering.
Are extended wheel bolts included? Yes. Each pair of MMX BMW G chassis wheel spacers includes ten extended-length grade 10.9 carbon steel black wheel bolts, correctly sized for the spacer thickness. Grade 10.9 exceeds OEM specification this is a critical safety requirement that many budget kits omit.
What is the difference between these and the F-chassis spacers? The G-chassis spacers use a 5×112 bolt pattern and 66.5mm center bore, matching the G20/G22/G80/G82 and GR Supra. The F-chassis spacers use a 5×120 bolt pattern and 72.6mm center bore, matching the F20/F30/F80 and earlier BMW generations. The two sets are not interchangeable.

About MMX Performance

MMX Performance is a UK-based specialist in performance parts for BMW and MINI vehicles, crafting high-quality upgrades that blend precision engineering, rigorous testing, and motorsport heritage. Driven by enthusiast culture, MMX designs its products in the UK and puts them through track validation to ensure durability, fitment accuracy, and on-road performance. Their catalog spans drivetrain components, spacers, hardware, and chassis enhancements, all tailored to elevate both the driving experience and visual appeal of BMW and MINI models.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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MMX Hubcentric Wheel Spacers for BMW G-Chassis Models / A9x Toyota GR Supra [MMR37-1612/MMR37-1615/MMR37-1618]

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MMX Hubcentric Wheel Spacers for BMW G-Chassis Models and Toyota GR Supra (12mm, 15mm, 18mm)

Why Hubcentric?

Features

Applications

Care and Maintenance

Notes

Frequently Asked Questions

About MMX Performance

Reviews