👑 SIRRIS F43 SX TUNE | 260 MM TRAVEL | Sur Ron Ultra Bee ⚡

Developed with Josh Hill. The ultimate Sur Ron Ultra Bee suspension solution 🔥

The F43 SX Tune is the top of the F43 range and it is not subtle. Developed in collaboration with Josh Hill to deliver the ultimate Ultra Bee front end, it runs a full 260 mm of travel with firmer damping, reinforced bottom out circuitry and increased oil volume over the standard F43 platform.

This is a supercross grade setup aimed at pro level and sponsored riders. In Sirris' own words, if you are not hitting 50+ foot jumps, this is not for you 🤯

⚙️ Key Specifications

• 📏 Travel: 260 mm
• 📐 Free Length: 856 mm
• ⚖️ Weight: 22 lbs / 10 kg (includes clamps and steerer)
• 🏗️ Architecture: Upside down fork
• 🔩 Stanchions: Ø43 mm high tensile steel, hard chrome
• 🛡️ Outer Tubes: 7050 aluminium, type 3 hard anodised
• 🔧 Drop Outs: Forged 6061 aluminium, type 3 hard anodised
• 🎯 Triple Clamps: Billet 6061 aluminium, type 2 anodised
• 🗜️ Steerer Tube: 7050 aluminium, type 2 anodised
• 💧 Damping: Symmetrical adjustable closed cartridge with spring backed modified IFP
• 🎛️ Adjusters: External LSC (low speed compression) and rebound adjustment
• 🔄 Rebound: Dual side high tensile steel spring, adjustable
• 🛢️ Oil Volume: Increased over standard F43
• 🧱 Bottom Out: Reinforced bottom out circuitry
• 🧴 Seals: NBR
• 🛡️ Guards: High impact PP, 210 degree wraparound

🏋️ Rider Weight Ranges & Spring Rates

The SX Tune is supplied in two spring rate options. Listed weights are rider weight without riding gear, with 15 lbs of gear already factored into the ranges.

• 🔵 Light (under 160 lbs): 5.4 / 5.0 springs
• 🔴 Medium (over 160 lbs): 5.8 / 5.0 springs

Spring rates are listed as left side / right side.

🎨 Clamp Colour Options

• ⚫ Black
• 🔵 Blue

📦 What's Included

• ✅ Pair of Sirris F43 SX Tune forks, 260 mm travel
• ✅ Billet 6061 triple clamps in your chosen colour (top and bottom)
• ✅ 7050 aluminium steerer tube
• ✅ 210 degree wraparound fork guards
• ✅ Springs matched to your selected rider weight range
• ✅ Fitting hardware

🚀 Why Choose The F43 SX Tune?

• 🏆 Josh Hill developed. Built and tested with one of the biggest names in freeride and supercross
• 📏 260 mm of travel. The longest stroke in the F43 range for the biggest hits
• 🧱 Reinforced bottom out circuit. Designed to survive landings that destroy normal forks
• 🛢️ Increased oil volume. Better heat management and consistent damping through a full session
• 🎨 Choose your look. Black or blue billet triple clamps
• 👑 Pro spec, no compromise. The absolute ceiling for Ultra Bee front end performance

📉 Optional Lowering Kit

If you want the SX damping package at a reduced ride height, select the Lowering Kit Installed option at checkout and the forks are supplied with the Sirris lowering kit professionally fitted before dispatch. Not sure whether lowering suits your riding? Message us first.

⚠️ Important — Please Read Before Ordering

🛠️ Made to order. Every F43 SX is built and valved to your selected spring rate and clamp colour. These are not held as generic stock items.

⏱️ Build time: approximately 5 to 20 working days.

🚚 Shipping time: approximately 5 to 10 working days depending on destination.

📅 Total estimated lead time: approximately 2 to 6 weeks from order. These are estimates and are not guaranteed.

🚫 Once your build has entered production, the order is non cancellable and non refundable due to the bespoke spring rate, valving, colour and labour involved. If a lowering kit is selected this also applies to the fitting labour.

🏁 This is a race product. The SX Tune is intended for advanced and pro level riders. It will feel firm for trail and general use. If you are unsure, the Trail or MX Tune is the better buy and we will tell you that honestly.

💬 We will keep you updated at every stage, from build confirmation through to dispatch.

📮 Order Tracking & Updates

Full tracking is issued the moment your forks leave us. Once the parcel is with the courier, transit times are outside of our control and occasional courier delays can happen, particularly on international shipments. International customers may be responsible for any duties and taxes charged on import.

❓ Got Questions?

Not sure if the SX is right for you? Message us before you order. We ride these bikes and we set these forks up, so we will point you at the right spec rather than just take the sale 👊

Sirris F43 SX Tune. The last word in Ultra Bee front end performance 👑⚡

Shop now at WGTracing.store 🔥