Sirris
Sirris F43 CMX Front Fork for Ventus One+
$2,250
Ships in 1–3 business days
Backordered until . Order now to hold one — it ships as soon as it’s back in stock.
Backordered at the supplier — restock date still to be confirmed. Order now to hold one; it ships the day it lands.
- Sourced & tested by riders
- Install service at our Colorado Springs shop
- Fitment questions? Text us — we ride these
Off-road / closed-course use unless your state says otherwise. Supermoto wheels do not make a bike street-legal — titling, lighting and registration are the rider's responsibility.
Confirm your exact model and year before ordering.— fits Ventus V1+
Description
Fits: Ventus One+ (V1+)
The Sirris F43 pairs an oversized 43 mm chassis with the CMX (Compact Motocross) tuned closed-cartridge damper. Tool-free compression adjusters give nearly 30 clicks of quick external adjustment, and the direct-mount crown bolts to a 4-bolt direct-mount stem.
Spring rate
Pick the range that matches your weight. Sirris tunes the Ventus One+ fork in two ranges (rider weight without gear; 15 lb of riding gear is already built in). Rates are left/right.
- Medium, 140–180 lb: 3.6/3.6 springs
- Heavy, 180–220 lb: 4.0/3.6 springs
Drop clamp option: raises the front 25 mm for a 21 in wheel while keeping 220 mm travel. Raising the front keeps the bike balanced when paired with a longer shock that raises the rear.
Fork specs
- Architecture: Upside-down fork
- Travel: 220 mm
- Free length: 775 mm (the drop clamp adds another 25 mm)
- Fork spacing: 178 mm, for unlimited tire choice (dirt or street)
- Fork weight: 4 kg per leg
- Stanchions: Ø43 high-tensile steel with hard chrome
- Outer tubes: Seamless 7050 aluminum, type 3 hard anodized
- Drop outs: 6061 aluminum, type 2 anodized; replaceable caliper mount brackets allow caliper and wheel upgrades
- Axle: Ultra-high-tensile hard-chromed axle
- Triple clamps: Billet 6061 aluminum, type 2 anodized, black or blue; the drop clamp is black only
- Steer tube: Seamless 7050 aluminum, type 2 anodized
- Damping: Symmetrical, adjustable closed cartridge with spring-backed modified IFP
- Damper bodies: Seamless 7050 aluminum, type 3 hard anodized
- Rebound: Dual-side high-tensile steel spring, adjustable
- Adjusters: External tool-free compression; rebound adjusted with a tool
- Seals / bushings: NOK MX seals, Daido MX bushings
- Guards: High-impact PP, 210-degree wraparound
Genuine part. Message us to confirm fitment before it ships.
Fitment
Fits: Ventus V1+
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Sirris F43 CMX Front Fork for Ventus One+
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