Hella 355123162 Vented Disc Brake Rotor, 7x130mm

The Hella 355123162 is a vented disc brake rotor cast from zinc-coated gray cast iron, sold as a single rotor. If you're replacing worn discs and want a straight, quiet, corrosion-resistant rotor that goes on without drama, this is a solid pick. It's a one-piece casting, so there's no bolted hat to loosen or corrode over the life of the part. What you install is what you get.

Let's talk about the vented design first, because it matters more than most people think. A vented rotor has cooling channels cast between its two friction faces. Those channels pull air through the disc as the wheel turns, and that airflow carries heat away from the braking surface. Heat is what kills brakes. Fade, glazing, warping, cooked pads, it all traces back to a rotor that can't shed heat fast enough. The vented casting here gives you real thermal headroom for repeated stops, long grades, and heavier loads.

The friction material is gray cast iron, which is still the standard for good reason. It bites consistently, it machines cleanly, and it damps vibration well so you get quiet, predictable braking. The zinc coating is the part worth calling out. Bare cast iron starts flash-rusting almost the moment it meets moisture, and that surface rust is what leaves ugly orange rings on a car parked for a week. The zinc coating protects the non-friction surfaces, the vanes, the hat, and the edges, so the rotor stays clean behind an open wheel and resists corrosion where road salt and spray collect.

Here are the numbers that decide fitment. The disc measures 28 millimeters thick across the friction faces and stands 68.40 millimeters tall overall. The hub size, or center bore, is 85 millimeters, and the inside diameter is also 85 millimeters. The wheel bolt pattern is 7 x 130 millimeters. Those figures need to match your hub and your wheel exactly, so measure your old rotor or check it against your vehicle's brake specs before you order. A rotor that's off by a millimeter on thickness or bore won't seat right, and it'll tell you with vibration or a soft pedal.

This rotor is sold individually. Brakes work as an axle set, so you should always replace rotors in pairs, left and right on the same axle, so both sides wear and heat evenly. Order two if you're doing a full axle. And whenever you fit fresh rotors, put fresh pads on with them. New pads mate to a new rotor surface during the bed-in process, and reusing old glazed pads on a new disc is the fastest way to end up with noise and uneven wear.

Installation is straightforward for anyone comfortable pulling a caliper. Clean the hub face down to bare metal so the rotor sits dead flat, because rust or grit trapped behind a rotor is a leading cause of runout and steering-wheel shimmy. The zinc coating on the friction faces wears off in the first few stops, so there's no need to scrub it, but a quick wipe with brake cleaner to lift any packing oil never hurts. Torque the caliper bracket to your vehicle's spec, then bed the pads in with a series of moderate stops from speed to lay down an even transfer layer.

Who's it for? Anyone doing a straightforward brake refresh who wants a quality replacement rotor at a fair price. It's a direct fit for applications that use the 7 x 130 millimeter pattern and the 85 millimeter bore, and the vented, zinc-coated construction runs cooler and looks better than a bare bargain disc. Confirm the specs against your vehicle, order in pairs, pair it with fresh pads, and you'll have a smooth, quiet brake job that lasts.