The Sirris F43 CMX Fork Upgrade for the E Ride Pro-SS 3.0, Pro-SS 4.0 and Pro-SR is a purpose-built electric dirt bike fork, made by Sirris and sold here at GritShift. It bolts on with 220 mm of bottom-out-resistant travel, closed-cartridge dampers in Medium or Heavy spring tunes, a 178 mm width and a 20 lb weight.
Specs verified October 2026 against the live GritShift product page.
Specifications
| Fork type | Bolt-on fork designed specifically for the E Ride Pro SR and SS 3.0 |
|---|---|
| Travel | 220 mm (17 mm more than stock) |
| Weight | 20 lb |
| Width | 178 mm, knobby or supermoto tires |
| Dampers | Closed cartridge, tuned for rider weight and style |
| Compression | Tool-free adjuster |
| Spring tunes | Medium (140 to 180 lb riders) or Heavy (180 to 220 lb riders) |
| Clamps | Scalloped billet, direct mount compatible on the standard bolt pattern |
| Axle and dropouts | Stiff for improved steering feel |
| Caliper brackets | Swappable for brake upgrades |
| Stem | Threaded stem conversion for proper preload |
| Stem riser note | OEM post mount style stem risers will not work with this fork |
What bikes does the Sirris F43 CMX E Ride fork fit?
- E Ride Pro-SS 3.0
- E Ride Pro-SS 4.0
- E Ride Pro-SR
Why upgrade the E Ride Pro front end to the F43 CMX?
Most forks on the market are generic rebrands or repurposed mountain bike parts, and Sirris set out to build something else: a fork engineered from the ground up for electric dirt bikes with real geometry, travel, stiffness and damping work behind it. The 220 mm of travel resists bottom-out and gives 17 mm more than the stock E Ride fork, so the bike feels more planted at speed and more controlled over jumps. We hammered this setup for over 6 months on our shop bikes and kept feeding results back to Sirris until it was dialed.
Medium or Heavy spring for an E Ride Pro-SS or Pro-SR?
The Medium tune is set for riders between 140 and 180 lb and suits trail and all-around riding. The Heavy tune covers 180 to 220 lb riders, senders, and anyone who wants extra headroom. Sirris adds a tip for lighter riders who ride hard: the Heavy spring gives more tunability and holds up better when landing big. Whichever you choose, the closed-cartridge dampers are tuned for that rider weight and style and the compression clicker needs no tools.
Will my stem riser and brakes carry over?
Not every riser will. OEM post mount style stem risers do not work with this fork; the F43 CMX uses scalloped billet clamps that are direct mount compatible on the standard bolt pattern, and a threaded stem conversion allows proper headset preload. Brakes are easier: swappable caliper brackets make brake upgrades simple, the stiff axle and dropouts sharpen steering feel, and the 178 mm width fits knobbies or supermoto tires.
Where can I buy the Sirris F43 CMX Fork Upgrade E Ride Pro 3.0/SR (220mm Travel)?
Right here. We sell the Sirris F43 CMX Fork Upgrade E Ride Pro 3.0/SR (220mm Travel) at GritShift, made by Sirris. Browse every fork and shock we carry in our Forks & Shocks collection.
