Harddrive 20MM REAR BELT 133T OE# 40073-07 — Harley-Davidson Softail Fat Boy, Softail Custom, Softail Night Train (2007-2011)

Harddrive 20MM rear belt with 133 teeth, engineered with carbon fiber reinforcement for V-Twin drivetrains. Synthetic rubber construction resists temperature extremes from -30°C to +130°C and operates quietly under load.

Features

• Carbon fiber tension member for superior strength versus aramid alternatives
• Specially treated tooth facing resists punctures and road debris
• Synthetic rubber teeth deliver low noise and temperature stability
• Synthetic rubber backing increases flexibility and width stability
• Operates reliably from -30°C to +130°C
• Made in the USA

Specifications

• Brand: Harddrive
• Manufacturer Part #: 21203000
• UPC: 191361537721
• Belt Size: 20MM, 133 tooth
• Length: 14 in
• Width: 14 in
• Height: 2 in
• Weight: 3 lbs

Fitment

Fits V-Twin motorcycles using OEM part number 40073-07 rear belt specification.

Frequently Asked Questions

Is this a direct replacement for my OEM belt?

Yes — this Harddrive belt matches OEM part number 40073-07 specification and fits any V-Twin that originally used that part.

What makes carbon fiber tension better than aramid?

Carbon fiber delivers higher structural strength and durability, reducing stretch and wear compared to traditional aramid reinforcement.

Will this belt handle cold winters?

Yes — synthetic rubber construction maintains flexibility and grip from -30°C to +130°C, so winter riding is supported.

Is this belt made in the USA?

Yes — Harddrive manufactures this belt domestically.

How do I know when to replace this belt?

Inspect for visible cracks, fraying, or glazed teeth. Replace if you notice slipping or hear unusual noise under acceleration.