8x165.1 is the eight-lug GM heavy-duty pattern. You will find it on heavy-duty trucks — Chevrolet Silverado 2500/3500 and GMC Sierra HD. We stock 4,582 wheels drilled 8x165.1.
Measuring is simple: count the studs, then measure the diameter of the circle they sit on. Five studs are measured from the far edge of one hole to the centre of the one two holes away; six or eight studs across opposite centres. Ordering the wrong pattern is the most common fitment mistake — if your measurement falls between two patterns, confirm with the vehicle's spec sheet first.
