The Heavy Hitter Ultra Bee F/R Brake Rotor Upgrade is a 240 mm stainless steel rotor for the Sur Ron Ultra Bee, sold by GritShift, that fits either the front or the rear wheel. It is 3.5 mm thick, quenched and tempered SUS420J2 stainless steel, machined in the same cut style as the Heavy Hitter sprocket.
Specs verified September 2026 against the live GritShift product page.
Specifications
| Position | Front or rear wheel |
|---|---|
| Diameter | 240 mm |
| Thickness | 3.5 mm |
| Material | SUS420J2 stainless steel, quenched and tempered |
| Design | Enhanced heat dissipation to prevent overheating during intense braking and reduce brake fade |
| Styling | Cut pattern matched to the Heavy Hitter sprocket |
What bikes does the Heavy Hitter Ultra Bee rotor fit?
- Sur Ron Ultra Bee
Front or rear: which wheel does it go on?
Either. Heavy Hitter sells this as one 240 mm rotor for the front or the rear wheel of the Sur Ron Ultra Bee, which is why the product name carries F/R. The upgrade is engineered for superior stopping power, improved heat dissipation and reduced brake fade during intense riding, whichever end of the bike it is fitted to.
Why SUS420J2 stainless steel, quenched and tempered?
The rotor is made from SUS420J2 stainless steel that has been quenched and tempered, a heat treatment Heavy Hitter specifies for improved longevity and strength. The disc is 3.5 mm thick, half a millimeter more than the 3 mm rotors Heavy Hitter makes for its 220 mm e-moto range.
How does the rotor reduce brake fade?
Brake fade comes from heat. The rotor's enhanced heat dissipation design prevents overheating during intense braking, which is what reduces brake fade on long descents and repeated hard stops. Together with the 240 mm diameter, that is the basis of the superior stopping power Heavy Hitter claims for the upgrade.
Does it match the Heavy Hitter sprocket?
Yes. The cut style of the rotor is matched to the Heavy Hitter sprockets so the two ends of the bike carry the same look; the Ultra Bee sprocket is the Heavy Hitter 520 Ultra Bee Super Sprocket.
Where can I get it?
The Heavy Hitter Ultra Bee F/R Brake Rotor Upgrade is made by Heavy Hitter and sold by GritShift.
