Gates PowerGrip GT4 25mm Primary Belt for Sur Ron Ultra Bee | 640-8MR-25MM

Maximize drivetrain reliability on your Sur Ron Ultra Bee with the Gates PowerGrip GT4 25mm Primary Belt (640-8MR-25MM). Developed through GritShift R&D in collaboration with Gates® engineers, this is a direct OEM replacement and performance upgrade engineered specifically for the Ultra Bee's flanged primary pulley system. Manufactured in the USA.

Why the GT4?

The Ultra Bee's wider belt sprockets are designed to handle higher torque loads than narrower platforms. The 25mm GT4 belt maximizes belt width for proper pulley engagement — eliminating overhang, misalignment, and the accelerated edge wear common with inferior aftermarket belts. Load is distributed evenly across the full belt width, reducing heat buildup and friction for longer service life.

Features

• Direct OEM replacement and performance upgrade for the Sur Ron Ultra Bee
• 25mm wide — maximum width for OEM belt sprockets
• Gates PowerGrip GT4 high-torque carbon synchronous construction
• Optimized tooth profile for stable tracking on flanged pulleys
• Reduced friction for smoother power transfer and longer belt life
• Ethylene elastomer compound resists stretch and wear
• Ideal for stock and high-output modified builds
• Developed with Gates® engineers | Manufactured in the USA

Specifications

• Brand: Gates / GritShift
• SKU / Part Number: 640-8MR-25MM
• Belt Width: 25mm
• Construction: PowerGrip GT4 Carbon Synchronous
• Weight: 0.24 lbs
• Fitment: Sur Ron Ultra Bee
• Origin: Made in the USA