The Heavy Hitter 4340 Chromoly Upgraded E Ride Rear Axle is a heat-treated chromoly steel rear axle, made by Heavy Hitter and sold here at GritShift, for the E Ride Pro-S, Pro-SS, Pro-SS 2.0, 3.0, 4.0 and Pro-SR. It is turned from 4340 chromoly, weighs 0.5 lb and ships with its 17 mm hex flange nut.
Specs verified September 2026 against the live GritShift product page.
Specifications
| Material | 4340 chromoly steel, turned |
|---|---|
| Heat treatment | Heat treated for additional durability and hardness |
| Weight | 0.5 lb |
| Drive on the shaft | 6 mm Allen and 12 mm hex nut |
| Hardware | 17 mm hex flange nut included |
| Failure mode | Bend-resistant rather than breaking or snapping |
| Position | Rear wheel |
What bikes does the Heavy Hitter 4340 rear axle fit?
- E Ride Pro-S
- E Ride Pro-SS
- E Ride Pro-SS 2.0
- E Ride Pro-SS 3.0
- E Ride Pro-SS 4.0
- E Ride Pro-SR
Why replace the stock E Ride rear axle?
Heavy Hitter engineered this axle to withstand extreme conditions without bending, breaking or snapping. It is stronger than the OEM axle, and its bend-resistant failure mode keeps you riding instead of pushing the bike back to the truck. The 4340 chromoly is turned, then heat treated for additional durability and hardness.
How do I install the axle?
The shaft carries a 6 mm Allen socket and a 12 mm hex nut for easy installation, and the 17 mm hex flange nut is included with the axle. Heavy Hitter does not publish a torque value for the axle on the product page.
Which other Heavy Hitter chromoly hardware fits the E Ride Pro?
The rear axle is one of several chromoly upgrades Heavy Hitter makes for the E Ride Pro. The jackshaft has its own bolts, the Heavy Hitter 4340 Chromoly Upgraded 10MM E Ride Jackshaft Bolt and the Heavy Hitter 300M Chromoly Upgraded 12MM E Ride Jackshaft Bolt, and the rear suspension pivots are covered by the Heavy Hitter 4140 Chromoly E Ride Linkage / Triangle / Shock Bolt Upgrade Kit. Riders fitting a billet swingarm can read the Rogue 2.5 Inch Extended E Ride Billet Swingarm specs.
Where can I buy the Heavy Hitter 4340 Chromoly Upgraded E Ride Rear Axle?
Right here. We sell the Heavy Hitter 4340 Chromoly Upgraded E Ride Rear Axle at GritShift. Browse every Heavy Hitter part we carry in our Heavy Hitter collection.
