Is it time to replace your race suit? Let’s get you track-ready. The Complete B-G and MOMO Mazda Steering Wheel Hub Guide
Ask for a Mazda boss kit and about forty listings come back at you. That is enough to make anyone close the tab, because it looks like you already need to know which one of the forty belongs to your car.
You do not. Fifteen parts cover every Mazda we hold, and one of them does most of the work. The MOMO MK5702 fits seven different Mazda families: the 121, the 323, the 626 with its MX-6 and Eunos 500 cousins, the 929 and RX-4, the MX-3, the MX-5 and the first RX-7. Same casting in every box, one listing per car.
So the useful question is not which of the forty, it is which of the fifteen. The chart below puts every dated Mazda fitment we list on a single year axis. Find your model, read the part number off it, then order the listing that names your car.
Fifteen parts cover forty years of Mazda
MK5702 is the one worth knowing. Our listings put it on the 323 from 1981, the 626, MX-6 and Eunos 500 up to 1991, the 929, RX-4 and Cosmo from 1983, the MX-3 between 1992 and 1998, the MX-5 between 1989 and 2005, the first RX-7 up to 1985 and the 121 up to 1995. MOMO’s own application list goes wider still and includes the Ford Laser, the Ford Probe and the Kia Sportage. It is the non airbag hub, so it suits the cars that left the factory with a plain wheel.
Where MK5702 stops, another part picks the car up. The RX-7 moves to MK5705 from 1986. The 626 family moves to MK5712 from 1992. The 121 changes twice, to MK4529 for the 1996 car and MA4536R from 1997. The MX-5 moves across to the B-G BG8178 when the Mk3 arrives in 2005, and that is the one modern Mazda in the range where B-G rather than MOMO has it covered.
Two things are worth a look on the listing itself. The first is the years. A few of ours say all years or pre-1980 rather than naming a range, so if your car sits near a changeover it is worth asking before you order. The second is that most of these parts appear twice on the site, once on an older listing and once on a newer one. The newer listings carry the boss kit number and the model in the description, so they are the ones to work from.
The 121 is the one I look up every single time. Three hubs across three date bands, and the listings sit next to each other in the search results. Sorting that sort of thing out is the job I do here, so if you are not certain which side of a changeover your car falls on, send us the registration and we will check it. I am Cameron and I look after fitment.
Why one hub takes wheels from four different brands
Every MOMO, Sparco, OMP and Simoni wheel we sell uses the same bolt pattern, six bolts on a 70mm circle. Your Mazda’s column is splined, and every make of car splines it differently, so the hub is the piece that turns your car’s spline into that one shared pattern. Get the right hub on the car and the wheel choice opens up completely.
B-G drill their hubs twice, 6 x 70mm and 6 x 74mm, so a Nardi, Personal or Raid wheel bolts straight on as well as anything on the MOMO pattern. They are cast aluminium and made in Italy. MOMO drill theirs for the 70mm pattern only.
Collapsible or solid is the other line to read, and it does not run neatly by brand. Across the Mazda range the MOMO hubs are collapsible apart from MA4536R and MA4538R, which our listings describe as solid. B-G runs the other way: BG8178 for the MX-5 Mk3 is collapsible and the older Mazda kits are solid. Both OMP hubs are solid. Every product page states which it is, so read that line rather than assuming.
The B-G Mazda hubs
B-G’s Mazda range is mostly the older cars, and two parts do most of the covering. BG8070 turns up on four listings, the 1000, the 1300 Savanne, the 323 before 1980 and the RX5 Cosmo. BG8325 covers three more, the pre-1980 RX7, the RX4 and 929, and the 929 from 1977. After that it is one apiece: BG8324 for the 10, 1500 and 1800, BG8071 for the Festiva and BG8072 for the Xedos.
The modern one is BG8178, the MX-5 Mk3 hub for cars built between 2005 and 2014. If you have a Mk3 and you have been searching MOMO, that is why you have not found it.
The MOMO Mazda hubs
Thirteen MOMO listings, six actual parts. Seven of those listings are MK5702 under a different car name each time. MK5712 accounts for two more, the 626 family from 1992 and the Xedos. Then one each: MK5705 for the RX-7 from 1986, MK4529 for the 1996 121, MA4536R for the 121 from 1997 and MA4538R for the Mazda 2 between 2002 and 2007.
That is worth saying out loud, because it changes how you shop. If your car is on MK5702 you are not hunting for a rare part, you are buying the most common hub MOMO make for a Mazda.
The OMP and Sparco Mazda hubs
OMP do two Mazda hubs. MA215 fits the 323, and MA218 covers the 626, Eunos 500 and MX-6 built after January 1992 along with the Xedos, which makes it a third option on that family alongside the MOMO and B-G parts. Both are solid.
Sparco do one. The listing does not name the model it goes on, so ask us before you order that one and we will confirm the fitment for your car.
If you would rather browse than work off the chart, these buttons land on our full Mazda range for each brand. Eleven kits from B-G, thirteen from MOMO and two from OMP.
Why not add a steering wheel quick release kit
A quick release sits between the boss kit and the wheel, in the spot shown on the diagram further up the page. Press the collar, pull, and the wheel comes off in your hand. It locates in one position going back on, so the wheel returns straight every time.
Two reasons people fit one. The first is getting in and out. With a cage, a bucket seat or the roof up on a small car, taking the wheel off buys a surprising amount of room. The second is that a car sitting there with no steering wheel in it is a good deal less appealing to anyone who fancies driving it away.
Our quick releases use the same six bolt 70mm pattern as the wheels and the hubs, so one drops into the middle of the stack without anything else changing.
Pair your Mazda boss kit with a steering wheel
With the hub sorted the wheel choice is open, and anything on the 70mm pattern fits. On an older Mazda a 350mm to 370mm classic three spoke suits the driving position and keeps the dials in view. On an MX-5 most people go smaller, somewhere around 320mm to 350mm. The steering gets a shade heavier at parking speeds and you gain room to get in and out.
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From £247.99 Excl. VAT Select options This product has multiple variants. The options may be chosen on the product page
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From £152.00 Excl. VAT Select options This product has multiple variants. The options may be chosen on the product page
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From £160.00 Excl. VAT Select options This product has multiple variants. The options may be chosen on the product page
Every wheel we list uses that same six bolt 70mm pattern, so once the hub is on the car you can change the wheel later without touching anything else.
Final thoughts
If you take one thing off this page, make it MK5702. It covers more Mazdas than any other hub in the range, and if your car is on it you are buying a part we stock in numbers rather than chasing something rare. Check the years your listing names, work from the newer listing where a part appears twice, and if the 121 or the 626 has you second guessing, send us the registration and we will confirm it.
Cameron, GSM Performance