Wheel offset (ET) decoder
What does 7.5Jx17 ET40 5x112 mean?
The rim is 7.5 inches wide (J flange) and 17 inches in diameter; ET40 means 40 mm of offset; 5x112 is the bolt pattern (5 bolts on a 112 mm circle). A smaller ET pushes the wheel further out.
- Effective offset
- ET35
- Outer face change
- +22.7 mm
- Inner clearance change
- +2.7 mm
Wheel position visual
Suspension / brake sideWheel arch side
- Current wheel:
7.5Jx17 ET45 - New wheel:
8.5Jx18 ET35 - Hub face · Effective offset: ET35 · Spacer effect: 0 mm
Positive outer change moves toward the arch; positive inner change reduces suspension/brake clearance.
Example decoded
| Width | 7.5″ J |
|---|---|
| Diameter | 17″ |
| offset | 40 mm |
| Bolt pattern | 5×112 |
| Centre bore | 66.6 mm |
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What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.