Most people meet Mugen wheels through the GP — the seven-spoke forged wheel that has been the brand’s signature for years. What almost nobody realises is how wide the rest of the range is, and that Mugen wheels are not all 5×114.3.
The Short Version
- The GP is forged, made by metal spinning, and Mugen claims 2.4 kg saved per wheel against the 17-inch OE.
- The TT is cast, 19 inch — and its centre cap is made by RAYS, which Mugen says on its own site.
- 4×100 exists. MD8, MD4, MDF and the smaller XJ and NR sizes are all four-bolt.
- 5×120 exists too — one NR size, and the revived MF10 for the FK8 and FL5 Civic Type R.
- Genuine GPs are stamped “Mugen Forged” and “Made in Japan”.
The GP
Mugen’s flagship. Forged, then metal spun — the rim is formed by pressing it against a rotating mandrel, which thins and work-hardens the material rather than cutting it away. Mugen’s own technical page states the rim gets down to 2.5 mm at its thinnest point.
The weight claim is stated plainly on Mugen’s own parts list: 2.4 kg lighter than the 17-inch original equipment wheel. That is per wheel, and on a car where the OE wheel is already reasonable it is a large number.
Sizes run 17 to 18 inch, 5×114.3, in Honda-specific fitments: 18×7.5J at +48 and +60, 17×7.5JJ at +52, 17×7J at +48.
The TT
“Touring and Touring.” A 19-inch cast one-piece wheel, 19×7.5JJ at +50 on 5×114.3.
The detail worth knowing is that Mugen credits RAYS with manufacturing the TT’s centre cap on its own product page. It is the only wheel in the range where Mugen names an outside manufacturer, and it is a small window into how these companies actually work — even a brand with Mugen’s engineering history does not make every component itself.
The Full Range, and the Bolt Pattern Surprise
| Model | Construction | Bolt pattern | Sizes |
|---|---|---|---|
| GP | Forged, metal spun | 5×114.3 | 17–18″ |
| MFZ | Metal spun | 5×114.3 | 17×7J +48 |
| MDA | Metal spun, two-tone | 5×114.3 | 18–19″ |
| MD8 | Metal spun | 4×100 | 16–17″ |
| MD4 | Metal spun, 4 spoke | 4×100 | 15–16″ |
| MDF | Cast | 4×100 | 16×6J +53 |
| XJ | Cast mesh | 5×114.3 and 4×100 | 15–19″ |
| NR | Cast, 10 spoke | 5×114.3, 4×100 and 5×120 | 14–18″ |
| TT | Cast one-piece | 5×114.3 | 19×7.5JJ +50 |
This is the practical takeaway. “Mugen wheels are 5×114.3” is a reasonable summary that will get you the wrong wheel. The MD4 in 15×5J +45 on 4×100 exists because older and smaller Hondas exist, and the NR spans three different bolt patterns depending on size.
Check the pattern for the specific size, not for the model name.
MF10, Then and Now
The MF10 was an S2000-era forged wheel — we have seen an original Mugen MF10 catalogue dated around 1999 — and it is not on the current parts list.
Mugen America has since revived the name for the FK8 and FL5 Civic Type R, in 18×9.5 at +45 on 5×120. That is worth flagging because 5×120 is a BMW pattern to most people’s ears, and it is here because the FK8 and FL5 Type R use it.
A modern MF10 and a 1999 MF10 share a name and nothing else.
Telling a Genuine One
Owner forums — TSX Club, Honda-Tech, 8thCivic — converge on a consistent set of checks for the GP:
- “Mugen Forged” and “Made in Japan” stamped on the back, near or under a spoke.
- Machining marks inside the wheel near the lug holes, which replicas commonly lack.
- Weight. An owner weighed a genuine 18×7.5 +48 GP at roughly 16.5 lb. Replicas run heavier.
We should be straight about how we know this. Those forums blocked our attempts to load them directly, so the above is a summary of their content rather than text we read on the page. Treat it as a strong lead to verify against the wheel in front of you, not as a specification.
What We Could Not Verify
- Whether genuine Mugen wheels carry
JWLandVIAmarks. As road wheels sold in Japan they would be expected to, but we did not confirm it against a photograph or spec page. - Any Mugen statement about counterfeit wheels. We found none.
- Current catalogue specs for the FS10 and MDCF straight from Mugen — that page would not render for us, so those figures come from retailers.
- The original MF10’s release and discontinuation dates.
- Verbatim forum wording on the GP stamping, for the reason given above.
Related Guides
- RAYS — who makes the TT’s centre cap
- BBS RS: real, replica or counterfeit — the same three-way distinction applies here
- Honda Civic and Honda S2000
- Honda Integra Type R
Finding Mugen Wheels
Mugen is a domestic Japanese brand and the used market for it is here. Tell us the Honda and the size through the Request page — and tell us the bolt pattern your car actually uses, because on this brand that is not a formality.