BBS-Style Gold Mesh Polished Lip Forged Wheels
Toyota Yaris / Honda Fit Fitment · 4-Lug
2003 Honda Mugen Civic Si Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Honda Mugen Civic Si wheels? This page gives the 2003 Honda Mugen Civic Si bolt pattern (4x100), centre bore, factory rim size and the offset range for aftermarket and forged Honda Mugen Civic Si rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2003 Honda Mugen Civic Si uses a 4x100 bolt pattern with a 56.1 mm centre bore and M12x1.5 lug nuts. Factory wheels: 17x7.0J ET45, front and rear. For aftermarket wheels, 17x7.0J ET40 sits flush and 17x7.0J ET35 is the most aggressive fit.
Forged wheels for the 2003 Honda Mugen Civic Si — drilled 4x100 with a 56.1 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in about 25 days.
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Honda Mugen Civic Si (2003): 4x100 bolt pattern, 56.1mm center bore. Factory wheels: 17x7.0J at ET45 offset, front and rear. Reference fitment ranges.
Bolt Pattern4x100
Wheel Bolt/NutM12x1.5 Nut
Center Bore56.1mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year2003
CategoryHot Hatch
Data check: the bolt pattern and center bore on this page have not yet been confirmed by a second independent source. Measure your hub or ask us before ordering. How we verify
Built to order by ANKUSI — IATF 16949 & ISO 9001 certified forged wheel manufacturer, TÜV/SFI/VIA compliant. See our factory & certifications →
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 17x7.0J F/R |
| Flush Fitment | 17x7.0J at ET40 offset |
| Maximum Aggressive | 17x7.0J at ET35 offset |
Forged wheels for the Honda Mugen Civic SiMachined to the 4x100 bolt pattern and 56.1 mm bore · 14–24 inch · offset calculated for your car · 3D drawing before production
How to Read Wheel Offset & Measurements
Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.
ANKUSI Engineering Expert Advice
Hot hatches and performance compacts are built around quick direction changes, so rotational mass at the wheel has an outsized effect on how the car actually feels to drive. Forging trims that mass while holding the same strength margin as the factory wheel, which is exactly the trade-off this kind of platform rewards.
The Honda Mugen Civic Si runs a 4x100 bolt pattern, 56.1mm center bore, and a 17x7.0J, front and rear, wheel from the factory. Our Flush Fitment reference is 17x7.0J ET40, which tucks the tire under the fender lip on a stock-height Honda Mugen Civic Si. Our Maximum Aggressive reference is 17x7.0J ET35 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Honda Mugen Civic Si OE Wheel Specs
The 2003 Honda Mugen Civic Si (Hot Hatch) uses a 4x100 bolt pattern with a 56.1mm center bore. Factory wheels are 17x7.0J F/R.
Why the factory spec works for most owners:
- Balances ride comfort with everyday drivability
- A commonly used size for this vehicle class, supporting parts and tire availability
- Maintains clearance for the factory suspension and brake components
- Provides stable, predictable handling across normal driving conditions
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Honda Mugen Civic Si (2003) we drill the 4x100 pattern and cut the centre bore to 56.1mm on our own CNC line, so the wheel hub-centres on the car with no spacer rings, in whatever diameter, width and offset you specify.
Converting these ET figures to backspacing? Use the wheel offset and backspacing calculator.
The figures on this page are part of our open wheel fitment dataset — 10,093 vehicles, free to download, CC BY 4.0.
Flush Fitment
For a flush look, F/R 17x7.0J ET40 is a commonly used starting point — clearance must be verified on a stock or mildly lowered Honda Mugen Civic Si.
Maximum Aggressive Fitment
F/R 17x7.0J ET35 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
5-Tier Configuration Options
A
Factory-Style
17x7.0J ET45Recommended setup: 17x7.0J ET45 | Economy impact: Negligible | Best for: Daily commuting, family use
Appearance: 7/10 | Comfort: 9.5/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $1,200-1,500 (wheels + tires + install)
B
Comfortable Upgrade
17x7.0J ET43Recommended setup: 17x7.0J ET43 | Economy impact: -2 to -4% | Best for: Daily / street
Appearance: 8/10 | Comfort: 9/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $1,950-2,550 (wheels + tires + install)
C
Balanced / Flush Fit
17x7.0J ET40Recommended setup: 17x7.0J ET40 | Economy impact: -4 to -6% | Best for: Street
Appearance: 8.5/10 | Comfort: 8/10 | Install difficulty: ★★☆☆☆
Estimated cost: $2,600-3,400 (wheels + tires + install)
D
Aggressive
17x7.0J ET38Recommended setup: 17x7.0J ET38 | Economy impact: -6 to -9% | Best for: Show / occasional track
Appearance: 9/10 | Comfort: 6.5/10 | Install difficulty: ★★★☆☆
Estimated cost: $3,900-5,000 (wheels + tires + install)
E
Max Aggressive
17x7.0J ET35Recommended setup: 17x7.0J ET35 | Economy impact: -8 to -12% | Best for: Show only
Appearance: 9.5/10 | Comfort: 4/10 | Install difficulty: ★★★★☆
Estimated cost: $4,800-6,200+ (wheels + tires + install)
Performance Comparison Matrix
| Metric | Tier A | Tier B | Tier C | Tier D | Tier E |
|---|---|---|---|---|---|
| Wheel Spec | 17x7.0J ET45 | 17x7.0J ET43 | 17x7.0J ET40 | 17x7.0J ET38 | 17x7.0J ET35 |
| Economy Impact | Negligible | -2 to -4% | -4 to -6% | -6 to -9% | -8 to -12% |
| Appearance | 7/10 | 8/10 | 8.5/10 | 9/10 | 9.5/10 |
| Comfort | 9.5/10 | 9/10 | 8/10 | 6.5/10 | 4/10 |
| Install Difficulty | ★☆☆☆☆ | ★☆☆☆☆ | ★★☆☆☆ | ★★★☆☆ | ★★★★☆ |
| Cost Range | $1,200-1,500 | $1,950-2,550 | $2,600-3,400 | $3,900-5,000 | $4,800-6,200+ |
| Best For | Daily commuting, family use | Daily / street | Street | Show / occasional track | Show only |
Real-World Reference Cases
The examples below are compiled from typical ANKUSI customer configurations and are labeled as reference cases, not individually verified real-world builds.
Case 1: Daily Driver (Factory-Style)
Profile: Everyday driving, prioritizes comfort and low running cost.
Setup: 17x7.0J ET45
Cost: ~$620
Outcome: Minimal visual change, ride and fuel economy essentially unaffected.
Case 2: Balanced Enthusiast (Balanced / Flush Fit)
Profile: Wants a sportier stance without sacrificing daily usability.
Setup: 17x7.0J ET40
Cost: ~$3,000
Outcome: Noticeable visual upgrade, fuel economy drop within the expected range.
Case 3: Show Build (Max Aggressive)
Profile: Built primarily for shows or occasional track/show use.
Setup: 17x7.0J ET35
Cost: ~$5,500
Outcome: Maximum visual impact; daily comfort and fuel economy are heavily compromised, physical test fit required before production.
Decision Guide
1
What's your primary use? Daily commuting → Tier A/B. Weekend street driving → Tier B/C. Show or occasional track use → Tier D/E.
2
What's your budget? Under $800 → Tier A. $800-3,400 → Tier B/C. $3,400+ → Tier D/E.
3
How much does fuel economy matter? Very important → Tier A. Somewhat important → Tier B/C. Not a priority → Tier D/E.
4
Still unsure? Tier C (Balanced / Flush Fit) is the default choice for most Honda Mugen Civic Si owners.
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: 17x7.0J ET45 → ~5.77″ backspacing
- Flush: 17x7.0J ET40 → ~5.57″ backspacing
- Max: 17x7.0J ET35 → ~5.38″ backspacing
A Note on Clearance
Final clearance depends on the exact tire model, suspension height, brake package, alignment and vehicle tolerances. A physical test fit is recommended before production.
Want to check a different width or offset before you order? Use our Offset & Backspacing Calculator to solve the numbers yourself, or looking for your exact Honda spec, or want a wheel built to a custom offset for your Honda Mugen Civic Si? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Custom Forged Wheels for the Honda Mugen Civic Si (2003)
Everything above is reference data. If you want wheels actually built to it, that is what ANKUSI does: we are a forged wheel factory in Guangzhou, China, IATF 16949 and ISO 9001 certified, forging on our own 10,000-ton press and producing over 120,000 wheels a year. Forging blank, CNC machining, finishing, coating and inspection all happen in the same building — nothing is subcontracted and nothing is relabelled from another manufacturer.
Every set is cut to order, so the 4x100 pattern and the 56.1mm centre bore are machined for this car specifically rather than shimmed with adaptor rings. Diameter, width, offset, concavity, monoblock or multi-piece construction and the finish are all yours to choose — most Honda orders on this platform land somewhere between the 17x7.0J ET40 flush setup and the 17x7.0J ET35 aggressive setup referenced above.
Designs we already tool for the 4x100 pattern — each one is re-cut to your sizes and offsets:
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What bolt pattern (PCD) does the Honda Mugen Civic Si use?
The 2003 Honda Mugen Civic Si uses a 4x100 bolt pattern.
How many lug bolts does the Honda Mugen Civic Si use?
The Honda Mugen Civic Si uses a 4-lug bolt pattern (4x100), so you need a 4-lug forged wheel to bolt straight on.
What is the center bore size on the Honda Mugen Civic Si?
The Honda Mugen Civic Si's center bore is 56.1mm. If an aftermarket wheel has a larger center bore than this, hub-centric rings are recommended so the wheel centers on the hub itself rather than relying on the lug bolts alone.
What size are the factory (stock) wheels on the Honda Mugen Civic Si?
Factory wheels on the Honda Mugen Civic Si are 17x7.0J F/R.
What is the biggest wheel size I can fit on my Honda Mugen Civic Si without rubbing?
The most aggressive fitment we recommend without fender work is 17x7.0J at ET35 offset. Going beyond this typically causes rubbing under compression unless you roll the fenders or add camber correction.
What does a flush wheel fitment look like on the Honda Mugen Civic Si?
For a flush look with minimal to no rubbing, we recommend 17x7.0J at ET40 offset as a starting point on a stock or mildly lowered Honda Mugen Civic Si.
Do I need wheel spacers for my Honda Mugen Civic Si?
No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.
How do I calculate wheel backspacing for my Honda Mugen Civic Si?
Backspacing (in inches) = wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance). For example, the flush spec above works out to roughly 5.57" of backspacing.
What's the difference between wheel offset and backspacing?
Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.
Can I run staggered wheels (different sizes front and rear) on my Honda Mugen Civic Si?
The Honda Mugen Civic Si runs the same wheel size front and rear from the factory, so staggered fitment is not required. ANKUSI can still forge a staggered set (wider rear) on request if you want a more aggressive stance.
Vehicles With the Same Hub as the Honda Mugen Civic Si (4x100, 56.1 mm Bore)
In our database, 40 other vehicle entries from 9 makes use exactly the same 4x100 bolt pattern and 56.1 mm center bore. Factory wheels from these cars bolt on and center on the hub without rings; offset and width still have to be checked.
4x100 is used by 6.9% of the vehicle pages in our English fitment guide (451 of 6,503); 9.1% of those also use a 56.1 mm center bore.
Offset and Backspacing: Factory Wheel vs Options
Backspacing ≈ width/2 + ET/25.4 + 0.5 in. "Inward" means closer to the suspension; "outward" means closer to the fender lip.
| Setup | Size | ET | Backspacing | Inward vs OE | Outward vs OE |
|---|---|---|---|---|---|
| Factory (OE) | 17x7J | ET45 | 5.77 in (147 mm) | — | — |
| Flush | 17x7J | ET40 | 5.57 in (142 mm) | −5 mm | +5 mm |
| Maximum | 17x7J | ET35 | 5.38 in (137 mm) | −10 mm | +10 mm |
Hub-Centric Rings for a 56.1 mm Center Bore
A wheel with a center bore larger than 56.1 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 57.1 mm | 57.1 → 56.1 mm |
| 60.1 mm | 60.1 → 56.1 mm |
| 63.4 mm | 63.4 → 56.1 mm |
| 64.1 mm | 64.1 → 56.1 mm |
| 73.1 mm | 73.1 → 56.1 mm |
ANKUSI forged wheels are bored to exactly 56.1 mm for this vehicle, so no ring is needed.
Sources and Last Update
Data checked against: avtoreference.com, tirewheelguide.com.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Other cars on the same factory size: 17x7 wheels · 17 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.
Forged Wheel Designs for the Honda Mugen Civic Si
Every design below is forged to order, so it can be machined to the Honda Mugen Civic Si's 4x100 bolt pattern and 56.1 mm center bore, with the width and offset calculated for your setup.
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Bolt pattern and center bore on this page come from published fitment references and are still awaiting a second independent check. Last reviewed 2026-09-18. Spotted an error? Email info@ankusi.com and we will verify and correct it.