Vendor: GritShift
Gates GT4 Primary Belt 640-8MR-25MM
Throttle Bros score
Not rated
How we score · both scores use the same four questions
This part = 69 entries towards the next giveaway
Description
The Gates PowerGrip GT4 640-8MR-25MM Primary Belt is a direct OEM replacement and performance upgrade for the Sur Ron Ultra Bee. Designed specifically for the flanged primary pulley system, this 25mm-wide GT4 belt delivers increased torque capacity, stable tracking, and long service life for stock and high-power builds. Developed through GritShift R&D with Gates engineers. Manufactured in the USA.
Fitment:
- Sur Ron Ultra Bee
The PowerGrip GT4 construction uses a high-torque synchronous design with an optimized tooth profile that maintains correct clearance on flanged pulleys. Load is distributed evenly across the 25mm belt width, reducing heat buildup, minimizing friction, and preventing premature failure common with inferior aftermarket belts. Durable ethylene elastomer compound resists stretch and wear. Whether replacing a failed belt or upgrading ahead of time, this GT4 belt is the proven solution for Ultra Bee reliability.
Fitment guide
Does it fit your bike?
No fitment data yet. Got this part on your bike? Tell us if it fit.
No Throttle Bros rating yet
Every product we test gets a real score and a video. Want this one next?
Rider Score
What riders say
$10 off your next order for any honest rating
Be the first to rate this. Same four scores the crew uses, about a minute, no account needed. Any honest rating earns $10 off your next order.
Rider gallery
On real bikes
$10 off your next order for an approved photo
No rider photos yet. Got this on your bike? Show it off and take $10 off your next order.