2018 Buick Regal TourX Wheel Backspacing
5.65 in · 6.18 in
Quick specs
- Backspacing
- 5.65 in · 6.18 in
- OEM offset
- ET42 · ET49
- Wheel size
- 8x18 · 8.5x18 · 8.5x19
- Bolt pattern
- 5×115
- Tire size
- 235/50R18 · 245/45R18 · 245/40R19
OEM configurations
| Configuration | Front | Rear | Offset | Backspacing | Tire | Bolt pattern | Center bore | Thread |
|---|---|---|---|---|---|---|---|---|
| 2.0T · 2.0L, LTG, I4, Petrol | 8x18 | 9x18 | ET42 / ET30 | 5.65 in | 235/50R18 | 5x115 | 70.3 mm | M12 x 1.5 |
| 2.0T · 2.0L, LTG, I4, Petrol | 8.5x18 | — | ET49 | 6.18 in | 245/45R18 | 5x115 | 70.3 mm | M12 x 1.5 |
| 2.0T · 2.0L, LTG, I4, Petrol | 8.5x19 | — | ET49 | 6.18 in | 245/40R19 | 5x115 | 70.3 mm | M12 x 1.5 |
Compare wheel position See wheel offset
Backspacing values above are calculated from OEM wheel width and offset using BS = width/2 + offset_mm/25.4 (same formula as the fitment calculator).
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More specs for the 2018 Buick Regal TourX
Backspacing on these pages is calculated from OEM wheel width and offset (width/2 + offset_mm/25.4). Higher backspacing seats the wheel farther inward; lower backspacing moves it outward.