Buick Regal Sportback Bolt Pattern

Catalog records for the Buick Regal Sportback use two bolt patterns: 5×108 for 2018 and 5×115 for 2019–2020.

Yes. Catalog records show two bolt patterns: 5×115 (2019–2020); 5×108 (2018). Choose the pattern that matches the vehicle you have.

Generation, year range, and configuration can change the hub. Catalog records for the Buick Regal Sportback list 5×115 for 2019–2020 and 5×108 for 2018. Do not assume later years match earlier years.

Catalog records show 5×115 for 2019–2020 (2 years).

Catalog records show 5×108 for 2018 (1 year).

Catalog records show 5 lugs on 5×115 (2019–2020); 5 lugs on 5×108 (2018).

5×115 means 5 lug positions on a 115 mm pitch circle. The first number is lug count; the second is the pitch circle diameter in millimetres.

5×108 means 5 lug positions on a 108 mm pitch circle. The first number is lug count; the second is the pitch circle diameter in millimetres.

Catalog records show 70.3 mm for the 5×115 variant and 63.4 mm for the 5×108 variant.

Catalog records show M12 x 1.5 for the 5×115 variant and M14 x 1.5 for the 5×108 variant.

Yes. 5×108 and 5×4.25 describe the same bolt circle: 5 lugs on 108 mm (4.25 in). Use either notation when comparing wheels.

Only with a bolt-on wheel adapter from the vehicle pattern (5×115 or the other recorded pattern) to the wheel pattern. Adapters are directional. Confirm thickness, center bore, thread, stud engagement, clearance, and load rating. Hub swaps and redrilling are not equivalent shortcuts.

You need a directed adapter whose source pattern is 5×115 and whose target pattern matches the wheels. 5×115 to another circle is not the same as the reverse unless the catalog lists both directions. Pick the target on this page; thickness is not chosen automatically.

Spacers must match the vehicle bolt pattern (5×115 or 5×108). Choose thickness for clearance and offset. Matching the pattern is not a claim that a given spacer fits the vehicle.

Only when the wheel center bore is larger than the vehicle hub. Catalog records show 70.3 mm for the 5×115 variant and 63.4 mm for the 5×108 variant. Rings fill that gap. They do not fix every vibration issue and they do not change bolt pattern.

The ring is wheel center bore (outer) to vehicle hub (inner). Enter the bore stamped on the wheel. Catalog matches are exact outer and inner millimetres, not nearby sizes.

No. A hub ring only fills a wheel bore that is larger than the hub. A smaller wheel bore cannot be opened with a ring.

Match the recorded thread. Catalog records show M12 x 1.5 for the 5×115 variant and M14 x 1.5 for the 5×108 variant. Seat style and length are not in this catalog — confirm those on the wheel before ordering.

Thread must match, but aftermarket wheels often need a different seat style or length. Matching thread is not enough by itself. Catalog records show M12 x 1.5 for the 5×115 variant and M14 x 1.5 for the 5×108 variant.

For odd lug counts such as 5, measure from the center of one hole to the far edge of a hole across the hub, then convert with a bolt-pattern gauge. 5×115 means 5 lugs on a 115 mm circle.