2012 Mazda Demio Wheel Hub

The 2012 Mazda Demio relies on a lightweight rear torsion beam suspension. The wheel hub is a Unitized Assembly, meaning the bearing is factory-sealed into the hub housing. At Ksh 4,000, an Ex-Japan unit is often preferred over cheap “new” aftermarket brands because it features the original NTN or Koyo internal bearings, which are known for their extreme longevity and low rolling resistance.

The “ABS Signal” Criticality

The 2012 model—especially the SkyActiv version (DEJFS)—is electronically sensitive.

• Factory Encoder: The hub contains a magnetic ring that the ABS sensor “reads.” Generic aftermarket hubs often have weak magnetic signals that cause the ABS light to flicker or the brakes to behave erratically. The Ex-Japan unit provides a 100% factory-spec signal.

• Fuel Efficiency: For SkyActiv owners, a smooth-rolling hub is vital. Worn bearings create “parasitic drag” that forces the engine to work harder, subtly dropping your km/L. These Japanese units use high-quality, low-friction lithium grease.

Front vs. Rear: A Key Distinction

• Rear (Ksh 4,000): This is the complete assembly. It’s a 4-bolt unit that can be swapped out in under 30 minutes by a competent mechanic.

• Front (Bearing Only): If you need a front fix for 4,000/-, you are likely buying a new or Ex-Japan bearing kit (e.g., DAC3972). The front hub is part of the steering knuckle and requires a hydraulic press to install the bearing.

Signs of Failure

1. The “Droning” Noise: A sound like a distant airplane that gets louder as you accelerate past 50 km/h.

2. Wheel Play: If the car is on a jack and you can “wiggle” the wheel by holding it at the 12 and 6 o’clock positions.

3. ABS Warning: A dashboard light accompanied by a “Wheel Speed Sensor” error code on a diagnostic scanner.