Surron Ultra Bee Primary Drive Front & Rear Pulley Kit V2

Quick Specs

Surron Ultra Bee Primary Drive Performance Upgrade

The heavier, higher-torque Surron Ultra Bee platform places substantial load on the primary drive during hard acceleration and off-road riding. Modified motor and controller setups can increase that load further.

The EBG V2 primary drive pulley kit combines a lightweight 7075-T6 aluminum rear hub with a heat-treated 420J2 stainless steel tooth ring. This hybrid construction reduces unnecessary rotating mass compared with an all-steel pulley while adding a wear-resistant surface where the belt contacts the pulley.

The system is designed to support stable belt tracking, smooth power transfer and consistent drivetrain response during demanding riding.

Built for Stock and Modified Surron Ultra Bee Builds

The EBG V2 kit is developed for everyday riding, off-road use and performance-modified Surron Ultra Bee builds. Its heat-treated pulley teeth help maintain consistent tooth geometry during extended operation, while the carbon-reinforced belt provides quiet, low-maintenance power transfer.

This pulley kit does not increase motor horsepower by itself. It is designed to improve primary-drive durability, belt engagement and the consistency of power transfer.

Hybrid Rear Pulley Construction

• CNC-machined 7075-T6 aluminum hub
• Heat-treated 420J2 stainless steel pulley ring
• Lightweight multi-level CNC pocketing
• Premium anodized finish
• Wear-resistant stainless steel tooth section
• High strength-to-weight ratio

The aluminum hub provides strength with reduced weight, while the heat-treated stainless steel ring handles belt contact and tooth wear.

Heat-Treated 420J2 Front Pulley

The front pulley is CNC machined from heat-treated 420J2 stainless steel. Its hardened tooth profile is designed for consistent belt engagement, improved resistance to tooth wear and stable operation under high drivetrain loads.

Carbon-Reinforced Drive Belt

The complete kit includes an EBG 25mm carbon-reinforced drive belt designed for smooth, quiet and low-maintenance power transfer on the Ultra Bee platform.

Motor Fitment

Confirm the required motor configuration before ordering: OEM Ultra Bee motor or the listed VTB Ryuga 81kW configuration.

If you are using an aftermarket motor or are unsure which option to choose, send us a clear photo of the motor output shaft before ordering.

This product is designed for Surron Ultra Bee and is not intended for other e-bike platforms.

Selectable Configurations and Package Contents

Full Pulley Kit + 25mm Carbon Belt

• 1 × EBG hybrid rear pulley
• 1 × EBG heat-treated 420J2 stainless steel front pulley
• 1 × EBG 25mm carbon-reinforced belt
• 1 × complimentary EBG Belt Tensioning Tool

Installation Notes

• Select the correct product and motor option before ordering.
• Check belt alignment, tension and clearance before riding.
• Check all fasteners and belt tension again after the first 50 km.
• Professional installation is recommended if you are unfamiliar with primary-drive alignment.

Frequently Asked Questions

Is this pulley kit made specifically for Surron Ultra Bee?

Yes. This product page is configured for Surron Ultra Bee. Do not use it for another bike platform.

Does this kit add horsepower?

No. The kit does not increase motor output. It is designed to improve belt engagement, drivetrain durability and the consistency of power transfer.

What is included in the kit?

The full configuration includes the front pulley, hybrid rear pulley, 25mm carbon-reinforced belt and complimentary EBG Belt Tensioning Tool.