Chevy S10 Wheel Bolt Pattern by Year
Direct Answer for a 1998 S10
A 1998 Chevrolet S10 uses a 5x120.65 mm wheel bolt pattern, commonly listed as 5x4.75 inches. This applies to both two-wheel-drive and four-wheel-drive trucks for that model year. The specification describes five lug holes arranged on a circle with a diameter of 120.65 mm. The center bore and offset differ from some other GM trucks, so the bolt pattern is not the only number to check when fitting wheels.
Bolt Pattern by Year, 1982 to 2004
For the first-generation S10 from 1982 through 1993, the pattern is consistent at 5x4.75 inches, or 5x120.65 mm. That includes model years such as 1991, 1992, and 1993. The second-generation S10, sold from 1994 through 2004, kept the same pattern. A 1994 S10 or 1995 S10 therefore also uses 5x4.75 inches. No factory S10 generation changed to a 5x5-inch or 6-lug layout during the standard production run.
Model Years | Bolt Pattern | Lug Count | Common Listing; 1982-1993 | 120.65 mm | 5 | 5x4.75 in; 1994-2004 | 120.65 mm | 5 | 5x4.75 in; 1991 2WD/4WD | 120.65 mm | 5 | 5x4.75 in; 1992 2WD/4WD | 120.65 mm | 5 | 5x4.75 in; 1994 2WD/4WD | 120.65 mm | 5 | 5x4.75 in; 1995 2WD/4WD | 120.65 mm | 5 | 5x4.75 in; 1998 2WD/4WD | 120.65 mm | 5 | 5x4.75 in
52 mm Hub Bore and Why It Matters
Most Chevrolet S10 trucks use a hub bore of approximately 70.3 mm. This is an area where confusion appears because other 5x4.75-inch GM vehicles can have a smaller hub register. The bolt pattern can match, but the wheel will not seat correctly if the center hole is too small for the S10 hub. Checking hub bore prevents the error of buying a wheel that bolts on but does not sit flush.
Offset and Backspacing
The S10 does not use an aggressive modern offset. Stock wheels generally sit at a positive offset, but published values vary by wheel width and trim. If a specific offset is needed for an aftermarket wheel, measure the current backspacing or use the range listed by the wheel maker for the S10. Relying only on bolt pattern can produce a wheel that clears the hub but rubs suspension or bodywork.
How to Confirm the Pattern on a Truck
With a 5-lug wheel, measure from the center of one stud to the outer edge of the lug hole directly across from it. Do not measure from center to center, because that does not work for odd-numbered lug patterns. For a 120.65 mm pattern, the center-to-outer-edge number should be close to 120.65 mm, or about 4.75 inches. Rust, worn hubs, or aftermarket spacers can make a quick tape measurement uncertain, so treat the number as a confirmation rather than a replacement for a model-specific fitment chart.
What the Bolt Pattern Does Not Tell You
A 5x4.75-inch pattern appears on several older GM passenger cars and trucks, but that does not make their wheels a direct S10 fit. Differences in hub bore, offset, brake clearance, and load rating can make a wheel unsuitable even when the lug holes line up. Before buying wheels for a 1991, 1992, 1994, 1995, or 1998 S10, confirm the bore and offset rather than selecting only by bolt pattern.