Since 2012 – Quality Wholesale Parts, Nationwide! Connect With Us Now

Auto Parts Glossary: Car Part Terms Explained

Auto parts come with a lot of jargon — PCD, offset, OEM, aspect ratio. This plain-English glossary explains the terms you’ll see most often when buying car parts in the Philippines, so you can shop with confidence.

Key Takeaways
  • Know these terms and you’ll avoid the most common buying mistakes.
  • Fitment terms (PCD, offset) matter most for wheels and tires.
  • Material terms (ceramic, semi-metallic) matter for brakes.
  • Still unsure? Message us with your car and we’ll translate.

PCD (Bolt Pattern)

The Pitch Circle Diameter — the number of wheel bolts and the diameter of the circle they form (e.g. 4×100). Your mags must match it. See our PCD guide.

Offset

How far a wheel’s mounting face sits from its centreline. The right offset gives proper clearance and a clean stance; the wrong one causes rubbing.

OEM

Original Equipment Manufacturer — parts made to match exactly what your car came with from the factory.

Aftermarket

Parts made by companies other than your car’s manufacturer. Quality ranges from budget to premium; brand and material matter most.

Ceramic Brake Pads

Brake pads made with ceramic compounds — quiet, low-dust, and long-lasting. Ideal for daily driving.

Semi-Metallic Brake Pads

Brake pads with high metal content for strong bite and heat resistance — great for loads and hard driving, but noisier.

Brake Shoe

The curved friction part in drum brakes (often on the rear of pickups and older cars), versus pads used in disc brakes.

DRL

Daytime Running Lights — lights that stay on during the day for visibility and a modern look.

Aspect Ratio

In a tire size like 185/65 R15, the 65 is the aspect ratio — the sidewall height as a percentage of the tread width.

Mags / Alloy Wheels

Lightweight wheels made from aluminium or magnesium alloy — better looks and performance than steel. See our mags price list.

PSI

Pounds per square inch — the unit for tire pressure. Use the value on your door-jamb sticker.

Fitment

Whether a part correctly fits your exact car (make, model, year, and variant).

Still have a question about a term?

Message us your car and what you’re trying to fix — we’ll translate the jargon and recommend the right part.

Chat with us — Viber 0907 133 4680

Frequently Asked Questions

What is PCD on a wheel?

PCD (Pitch Circle Diameter) describes the number of bolt holes and the diameter of the circle they form. Your mags must match your car’s PCD.

What’s the difference between OEM and aftermarket?

OEM matches your car’s factory parts exactly; aftermarket is made by other brands and ranges from budget to premium quality.

What does tire aspect ratio mean?

It’s the sidewall height as a percentage of the tire’s width — the middle number in a size like 185/65 R15.