The Complete B-G and MOMO Porsche Steering Wheel Hub Guide
Porsche is a MOMO make, and that is the single most useful thing I can tell you before you start searching. I am Cameron, I look after the steering wheel side of things at GSM Performance.
MOMO list nineteen Porsche hubs against five from B-G, and the B-G ones are almost entirely the 981 Boxster and Cayman. If you are in anything air-cooled, a 924, a 944 or a 928, your hub comes from MOMO or OMP. The good news for the early cars is that one part, MC0230, covers the 356, the pre-1974 911, the 912 T, the 1600 and the six cylinder 914, so a lot of owners are all buying the same hub under different listings.
Below is the whole Porsche range, what each hub covers, and the wheels that bolt to it.
The in-car photograph in this guide is an AI illustration, generated from our own MOMO Prototipo product photography so the wheel and its horn button are the real thing.
Why you need a B-G or MOMO boss kit
An aftermarket wheel will not bolt onto a Porsche column on its own. The column has splines, the back of the wheel has a bolt pattern, and the boss kit is the part that joins the two. It also sets how far the wheel sits from the dash, which on a 911 decides how much of the five dial binnacle you can actually see through the rim.
Both brands machine theirs from cast aluminium and put the fixing screws, the Allen key and the horn button retaining ring in the box, so nothing is missing halfway through the job. The B-G kits are made in Italy and drilled twice, for 6 x 70mm and 6 x 74mm. The MOMO kits are drilled 6 x 70mm.
It joins two different fittings
Your column has splines. The back of the wheel has a bolt pattern. The hub is the only part that speaks both.
It sets how far the wheel sits
The hub decides the distance from the dash, which changes your reach to the indicator stalks and the clearance over your knees.
Nothing else to buy
The fixing screws, the Allen key and the horn button retaining ring are all in the box, so nothing stops you halfway through the job.
The 911 changes hub three times across its air-cooled life. MC0230 covers the 356 and everything up to 1973, MC0231 takes over for the 1974 to 1989 cars, and the 964 Carrera 2, 4 and RS from 1989 to 1994 moves to ML7004. The 997 jumps to MK8017R, which is the same modern part the Boxster 987, the Cayman 987 and the first Cayenne use.
The transaxle cars split on year too. The 924 up to 1982 and the 944 up to 1984 share MC8010, the 944 from 1985 takes ML7004, and the 928 splits at 1989 between MC0231 and ML7005.
Steering wheel installation explained
So how does a Sparco wheel end up on a MOMO hub? Because nearly every aftermarket motorsport wheel is drilled to the same pattern, six bolts on a 70mm circle, written as 6 x 70mm PCD. MOMO, Sparco, OMP, Simoni Racing and the Mountney M-Range all use it. The hub is chosen by your car, the wheel is chosen by you, and nothing locks you into one brand.
MOMO, Sparco, OMP, Simoni Racing and the Mountney M-Range.
Nardi, Personal and Raid.
Fitting it, in order
- 1Hub onto the column
- 2Wheel onto the hub
- 3Horn wire onto the tab
- 4Retaining ring holds the horn button
How each brand drills its hubs
The Porsche B-G boss kit range
Five B-G Porsche hubs. Three of them are BG8373, which covers the 981 Boxster, the 981 Cayman and the Cayman GT4 Clubsport, and it is a collapsible design. The other two are listed as Various Models under their part numbers, BG8377 and BG8383, so send us your registration and we will tell you whether either one suits your car.
All five are dual drilled, so any wheel further down this page will bolt straight to them.
Our top MOMO Porsche boss kit collection
Nineteen MOMO hubs, and this is where nearly every Porsche is served. All drilled 6 x 70mm.
MC0230 is the big one, covering the 356, the pre-1974 911, the 912 T, the 1600 and the six cylinder 914. MC0231 does the 1974 to 1989 911, the 912 S and the pre-1989 928. ML7004 covers the 964 Carrera and the 1985 onward 944, and MK8017R handles the 997, the 987 Boxster and Cayman and the 2003 to 2010 Cayenne.
One to know about: the four cylinder 914 from 1972 takes MA8002, and it is the only solid hub in the MOMO Porsche range. Every other one is a collapsible design.
Explore our full range of B-G and MOMO boss kits
The links here run a live search across the store, so they stay current as the range moves. OMP are worth a proper look on a Porsche because they cover the 911, the 912, the 914, the 924, the 928, the 944, the 996, the Boxster and the 981 GT4 Clubsport, and they have a hub listed for all models up to 1973. Those are a solid, non-collapsible design, which is what most track and competition cars run. If your Porsche is not showing up in any of the three ranges, ask. The early cars in particular share columns across models more than the listings suggest.
B-G Racing
5 Porsche hubs
Dual drilled and made in Italy. Three of the five are BG8373 for the 981 Boxster and Cayman.
View the B-G Racing Porsche range
MOMO
19 Porsche hubs
Collapsible and drilled 6 x 70mm. Nineteen hubs, and where nearly every Porsche is served.
View the MOMO Porsche range
OMP
8 Porsche hubs
A solid, non collapsible design. The 911, 912, 914, 924, 928, 944, 996, Boxster and 981 GT4 Clubsport.
View the OMP Porsche rangeWhy not add a steering wheel quick release kit
A quick release sits between the boss kit and the wheel and lets you pull the wheel off the column in a second. Two reasons people fit them. Getting in and out past a fixed wheel in a caged car is awkward, and a wheel that comes off with you is a wheel nobody can drive away with.
B-G Racing do four. The universal and the standard bolt-on versions suit most road and track cars and need nothing modifying. The weld-on 3-point and 6-point are for a car where the column is being cut and welded anyway. All four take the same 6 x 70mm wheels as everything else on this page.
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Pair your boss kit with a high performance steering wheel
Once the hub is sorted the wheel is entirely your choice. These are the ones I would put in a Porsche, and I have leaned classic because that is what most of these cars want.
The Prototipo is the obvious one and it is in here at both 350mm and 370mm, plus the Heritage version. If you are running a 911 with the tan interior and want something warmer, the Mod.07 Heritage Wood or the California Heritage Wood look like they left the factory that way. For a 944 or a 924 being used on track, the Sparco 345 or the OMP Corsica is the more sensible rim.
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Every wheel we sell is drilled 6 x 70mm, so any of them will bolt to any of the hubs above. The only real decision is diameter and dish, which changes how heavy the steering feels and how close the rim sits to your chest.
Final thoughts
Between MOMO, OMP and the handful of B-G parts there is a Porsche hub for almost everything from a 356 to a 981 Cayman. The part is cheap next to the wheel, and getting it right is a case of matching the model and the year in the listing to your own car.
If you are stuck between two listings, drop us a line and ask for me. Send the registration over and I will tell you which hub you need before you spend anything.
Cameron
