Let's explore the world of motorcycle and scooter bearings – essential components for ensuring the proper functioning of engines, wheels, transmissions, and much more. They're small, but they make a big difference in terms of reliability and smoothness.

🔩 1. Crankshaft Bearings (Bench)

Mounted at the ends of the crankshaft.

• Types:
  🔹 Ball bearings
  🔹 Roller bearings
• They often require specific seals (oil seals).
• They must withstand high temperatures and high rpm.

🛞 2. Wheel Bearings (Hubs)

Mounted in the front and rear wheel hub

• They must withstand radial and axial loads.
• Watertight or shielded (ZZ, 2RS)

⚙️ 3. Transmission / Gearbox Bearings

Present in the gearboxes of geared motorcycles.

• Often on primary/secondary shafts and gears
• High precision, they must withstand constant loads

🧩 4. Variator and Clutch Bearings (Scooter)

Some scooters have bearings in the torque converter or clutch.

Also present in multivar and overrange systems.

🛠️ 5. Steering Bearings (Headsets / Fifth Wheels)

• Spherical or conical
• They allow the fork to rotate smoothly
• In kit with caps and grease

🧰 6. Swingarm Bearings / Suspension Linkages

On enduro, cross and sports bikes

• They must be resistant to dust, water, mud → or with dust covers

🧪 How to choose the right bearing?

You need to know:

• 📌 Measurements
• 🧾 Initials
• 📍 Mounting position (wheel, bench, variator, etc.)
• 🚨 If it needs to be reinforced (racing) or is it for normal use

🔧 Useful acronyms to know

2RS -> Rubber seal on both sides

ZZ -> Metal shielded

C3 / C4 -> Increased internal clearance (high performance)

TN9 -> Polyamide cage