The Sirris F43 CMX fork brings full-size suspension construction and adjustable closed-cartridge damping to the E-Ride Pro SR. With 43mm stanchions, 220mm of travel, and CMX (Compact Motocross) tuning, it delivers the support and control needed for aggressive riding.
External compression and rebound adjustments let you dial in the fork for your riding style, while sturdy construction provides the strength needed when pushing the SR to its limits.
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Key Features
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CMX Tune: Compact Motocross tuning designed for aggressive riding.
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Full-size construction: 43mm hard-chrome steel stanchions and sturdy aluminum outer tubes provide strength and steering precision.
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220mm of travel: Suspension travel to handle rough terrain and demanding riding.
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Symmetrical closed-cartridge dampers: Adjustable dampers with spring-backed modified internal floating pistons.
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External adjustments: Tool-free compression adjustment and tool-operated rebound adjustment.
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Upgrade flexibility: Replaceable caliper mount brackets accommodate brake and wheel upgrades, while 178mm fork spacing provides clearance for a wide range of dirt and street tires.
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Optional drop clamp: Adds 25mm of extended length and allows for a 21-inch front wheel conversion.
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Quality seals and bushings: NOK MX seals and Daido MX bushings support smooth operation and durability.
Rider Weight and Spring Selection
Sirris offers two weight ranges when selecting your CMX Tune F43 fork for the E-Ride Pro SR. Select your spring option based on rider weight without riding gear. Sirris already accounts for 15 lbs of riding gear in the ranges below.
Fork spring rates are listed as left side / right side.
| Rider Weight Without Gear |
Spring Option |
Springs — Left / Right |
| 140–180 lbs |
Medium |
4.0 / 4.0 |
| 180–220 lbs |
Heavy |
4.4 / 4.0 |
Specs
F43 CMX Tune Specifications
| Specification |
Details |
| Fitment |
E-Ride Pro SR |
| Tune |
CMX — Compact Motocross |
| Architecture |
Upside-down fork |
| Travel |
220mm |
| Free Length |
775mm; optional drop clamp adds 25mm of extended length |
| Fork Spacing |
178mm |
| Fork Weight |
4 kg per leg |
| Stanchions |
Ø43mm, high-tensile steel with hard chrome |
| Outer Tubes |
Seamless 7050 aluminum, Type 3 hard anodized |
| Dropouts |
6061 aluminum, Type 2 anodized, with replaceable caliper mount brackets |
| Axle |
Ultra-high-tensile, hard-chromed axle |
| Triple Clamps |
Billet 6061 aluminum, Type 2 anodized; blue or black |
| Optional Drop Clamp |
Black only; allows for 21-inch front wheel conversion |
| Steer Tube |
Seamless 7050 aluminum, Type 2 anodized |
| Damping |
Symmetrical, adjustable closed cartridges with spring-backed modified IFP |
| Damper Bodies |
Seamless 7050 aluminum, Type 3 hard anodized |
| Springs |
Dual-side high-tensile steel springs, adjustable |
| Adjusters |
External tool-free compression adjustment and tool-operated rebound adjustment |
| Seals |
NOK MX seals |
| Bushings |
Daido MX bushings |
| Guards |
High-impact PP, 210-degree wraparound |
Fitment
Note: If you are planning to run a 21-inch front wheel, please select the optional drop clamp.
