Name: Vorsprung Secus Fork Air Spring Upgrade Kit - Fox & Rockshox Forks
Brand: S4 Suspension
SKU: VG-SECUS-FOX-A1
Price: 495.0 CAD
Availability: InStock

$495.00

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For the first time, we created an air spring with a truly better spring rate, everywhere in the travel, than a coil. The Secus upgrade delivers the first and only air spring system to really come indistinguishably close to the linear spring rate of a coil fork for the entire first 2/3rds of its travel, with the advantage of a gentle end stroke progression to prevent bottoming without the “wall of force” harshness that excessively progressive springs create.

Secus Advantages:

An enlarged negative air spring chamber delivers a soft, supple initial stroke for ultimate small bump compliance (yes, even compared to the Luftkappe)

Proprietary Midstroke Support Valve improves predictability and support beyond the sag point

Reduced lower leg pneumatic ramp means better scalability of the air spring, particularly for light riders who previously struggled to use full travel

Plush and predictable like a coil, bottomless like an air spring

Allows full use of travel in both directions - fully extends to topout without any quibbles (including on Debonair B1 air springs) and fully compresses without excessive ramp

Allows more lower leg bath oil to be used for superior lubrication

Considerably lighter than coil conversions - adds approximately 130g

Simple setup - inflate fork, bounce on it a few times, press MSV charge button, go ride

Compatible with OEM volume spacers for end-stroke progression adjustment

Compatible with other aftermarket top-cap systems such as DSD Runt and MRP Ramp Control

Lower compression ratios mean a more consistent spring rate

Transferrable between any Secus-compatible forks with only a footstud to change at most

Initial stroke - enlarged negative air spring chamber delivers a soft, supple initial stroke for ultimate small bump compliance

Midstroke - where traditional air spring rates drop off in the midstroke, our proprietary Midstroke Support Valve technology boosts the midstroke spring rate to maintain linearity, for support, predictability, ride height and compliance

End stroke - enlarged lower leg volume reduces overall progression even at higher pressures and allows for a wider range of end-stroke ramp options to be utilised with standard fork volume spacers.

COMPATIBILITY:

Fork	Year & Specification	Secus Variant
Fox 32	2018+ (unless footnut on spring side is recessed)	Fox A1
Fox 34	2018+ (unless footnut on spring side is recessed)	Fox A1
Fox 36	2018+	Fox A1
Fox 38	2021+	Fox A2
Fox 40	2018+ (Note: Installation tool sold here, air spring is difficult to disassemble)	Fox A3
Fox 32 StepCast	Not Compatible
Fox 34 StepCast	Not Compatible
Marzocchi Z1	2019+	Fox A1
Rockshox Pike / Revelation (2014-2018)	Requires 2019-20 (B1/B2) Debonair Airshaft update to be directly compatible, or you may use the (2021) C1 Debonair Airshaft and replace the sealhead. The BIP (Bananas in Pyjamas) B1/B2 sealheads can be included in the kit by selecting the dropdown option in 'Tools Required', and may also be purchased separately here. Secus is not compatible if air side footbolt is recessed in the lowers (some 2018 forks).	Rockshox A3
Rockshox Pike / Revelation (2019-2020)	Compatible unless footbolt on spring side is recessed. No replacement sealhead needed if using stock air shaft (B1/B2).	Rockshox A3
Rockshox Pike / Revelation (2021+)	Requires 2019-20 (B1/B2) Debonair Airshaft update to be directly compatible, or you may use the (2021) C1 Debonair Airshaft and replace the sealhead with the BIP (B1/B2) sealheads. The BIP (Bananas in Pyjamas) B1/B2 sealheads can be included in the kit by selecting the dropdown option in 'Tools Required', and may also be purchased separately here.	Rockshox A3
Rockshox Lyrik / Yari (2016-2018)	Requires 2019-20 (B1/B2) Debonair Airshaft update to be directly compatible, or you may use the (2021) C1 Debonair Airshaft and replace the sealhead with the BIP (B1/B2) sealheads. The BIP (Bananas in Pyjamas) B1/B2 sealheads can be included in the kit by selecting the dropdown option in 'Tools Required', and may also be purchased separately here.	Rockshox A3
Rockshox Lyrik / Yari (2019+)	Compatible. No replacement sealhead needed for 2019-21 (B1), BIP sealhead is required for C1 air shafts (red footstud) on 2021-22 forks.	Rockshox A3
Rockshox Zeb (2021+)	Compatible. No replacement sealhead needed.	Rockshox A3
Rockshox Boxxer (2019+)	Compatible. No replacement sealhead needed.	Rockshox A3
Any year Rockshox Pike or Lyrik forks with 35mm C1 (2021+ style) air shaft kit installed	Requires Bananas In Pyjamas (BIP) Sealhead to be installed. The BIP (Bananas in Pyjamas) B1/B2 sealheads can be included in the kit by selecting the dropdown option in 'Tools Required', and may also be purchased separately here.	Rockshox A3
Rockshox Lyrik (2023+)	Compatible. No replacement sealhead needed. Includes A3 adaptor to replace Buttercups on relevant air shafts.	Rockshox A3
Rockshox Pike (2023+)	Compatible. No replacement sealhead needed. Includes A3 adaptor to replace Buttercups on relevant air shafts.	Rockshox A3
Rockshox Zeb (2023+)	Compatible. No replacement sealhead needed. Includes A3 adaptor to replace Buttercups on relevant air shafts.	Rockshox A3

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