Specialized Future Shock 3.0 Spring Kit Soft Medium Firm OEM
Specialized Future Shock 3.0 Spring Kit Soft Medium Firm OEM
Stage 21 Bikes
23582 Moulton Parkway
#111
Laguna Woods CA 92637
United States
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Specialized Future Shock 3.0 Main Spring Kit
Soft, Medium & Firm Booster Springs | Complete 3-Spring Kit | S233100001
The Specialized Future Shock 3.0 Main Spring Kit is the genuine factory replacement and tuning spring set for Future Shock 3.0 cartridges.
The kit includes **all three available booster spring rates—Soft, Medium, and Firm—**allowing the Future Shock system to be tuned for rider weight, riding style, and preferred suspension feel. Changing the booster spring adjusts the system's spring support and preload characteristics while maintaining the factory Future Shock configuration.
Specialized recommends consulting the Future Shock 3.0 User Manual to select the appropriate spring rate based on rider weight.
Available from Stage 21 Bikes, your trusted source for hard-to-find Specialized OEM replacement parts.
Key Features
- Genuine Specialized Future Shock replacement and tuning kit
- Compatible with Future Shock 3.0 cartridges
- Includes all three spring rates
- Soft, Medium, and Firm booster springs
- Allows Future Shock spring feel to be tuned for rider weight and preference
- Factory-spec replacement components
- Complete three-spring kit
- Specialized MPN S233100001
Spring Rates
| Spring | Identification | Spring Rate | Imperial Rate |
|---|---|---|---|
| Soft | Blue | 2.3 kg/mm | 129 in-lbs |
| Medium | Blue | 2.6 kg/mm | 146 in-lbs |
| Firm | Yellow | 2.9 kg/mm | 162 in-lbs |
Kit Includes
- 1 × Soft Future Shock 3.0 Spring – Blue
- 1 × Medium Future Shock 3.0 Spring – Blue
- 1 × Firm Future Shock 3.0 Spring – Yellow
Three springs total.
Specifications
| Specification | Details |
|---|---|
| Brand | Specialized |
| Product | Future Shock 3.0 Main Spring Kit |
| Application | Future Shock 3.0 |
| Spring Rates | Soft / Medium / Firm |
| Quantity | 3 Springs |
| Soft Rate | 2.3 kg/mm / 129 in-lbs |
| Medium Rate | 2.6 kg/mm / 146 in-lbs |
| Firm Rate | 2.9 kg/mm / 162 in-lbs |
| MPN | S233100001 |
OEM Compatibility
2027
- Vado SL 5.0 Step Through EQ 2
- Vado SL 5.0 EQ 2
- Turbo Vado SL 2 6.0 EQ Carbon
- Turbo Vado SL 2 6.0 Carbon
- Turbo Vado SL 2 4.0 Step-Through EQ
- Turbo Vado SL 2 4.0 Step-Through
- Turbo Vado SL 2 4.0
- Turbo Creo 2 Expert – Shimano GRX Di2
- Turbo Creo 2 Comp E5 – SRAM Apex Eagle
- Turbo Creo 2 Comp – Shimano GRX Di2
- Sirrus X 5.0
- S-Works Turbo Creo 2 – SRAM RED / XX1 Eagle AXS
- S-Works Roubaix SL8 – SRAM RED AXS
- Roubaix SL8 Sport – Shimano 105
- Roubaix SL8 Pro – SRAM Force AXS
- Roubaix SL8 Expert – SRAM Force AXS
- Roubaix SL8 Comp – Shimano 105 Di2
- Roubaix SL8 Comp – SRAM Rival AXS
- Roubaix SL8 – Shimano Tiagra
- Diverge 4 Pro – SRAM Force XPLR
- Diverge 4 Pro LTD – Shimano XTR / GRX Di2
- Diverge 4 Expert – SRAM Rival XPLR
2026
- Turbo Vado SL 2 5.0 Step-Through
- Turbo Vado SL 2 5.0
- Turbo Vado SL 2 4.0 Step-Through
- Turbo Vado SL 2 4.0
- S-Works Roubaix SL8 LTD – Red Bull–BORA–hansgrohe Edition
- Creo SL E5 Comp
2025
- Turbo Vado SL 2 Carbon LTD – Forward 50 Collection
- Turbo Vado SL 2 6.0 EQ Carbon
- Turbo Vado SL 2 6.0 Carbon
- Turbo Creo 2 Expert
- Turbo Creo 2 Comp E5
- Turbo Creo 2 Comp
- Sirrus X 6.0
- Sirrus X 5.0
- Sirrus X 4.0 EQ
- Sirrus X 4.0
- S-Works Turbo Creo 2
- S-Works Roubaix SL8 – SRAM RED AXS
- S-Works Roubaix SL8 LTD – SRAM RED AXS
- S-Works Roubaix SL8 Frameset
- S-Works Roubaix SL8 Di2
- Roubaix SL8 Sport Apex
- Roubaix SL8 Sport 105
- Roubaix SL8 Pro
- Roubaix SL8 Expert
- Roubaix SL8 Comp
- Diverge STR Comp
2024
- Turbo Creo 2 Expert
- Turbo Creo 2 Comp E5
- Turbo Creo 2 Comp
- S-Works Turbo Creo 2
- S-Works Roubaix SL8 Frameset
- S-Works Roubaix SL8
- S-Works Diverge STR
- Roubaix SL8 Sport Apex
- Roubaix SL8 Sport 105
- Roubaix SL8 Pro
- Roubaix SL8 Expert
- Roubaix SL8 Comp
- Roubaix SL8
- Diverge STR Pro
- Diverge STR Expert
- Diverge STR Comp
2023
- Turbo Creo 2 Expert
- Turbo Creo 2 Comp
- S-Works Turbo Creo 2
- Future Shock 3.3 applications
Spring Selection
The three included springs allow the Future Shock system to be configured for different rider weights and desired ride characteristics.
- Soft – 2.3 kg/mm: Lower spring rate
- Medium – 2.6 kg/mm: Intermediate spring rate
- Firm – 2.9 kg/mm: Higher spring rate
For the correct spring selection, consult the Specialized Future Shock 3.0 User Manual and use Specialized's recommended spring rate for your rider weight and Future Shock configuration.
Compatibility Notes
- Designed for Specialized Future Shock 3.0 cartridges.
- Kit contains all three available booster spring rates.
- This listing is for the spring kit only; the Future Shock cartridge is not included.
- Soft and Medium springs are both identified as blue, but have different spring rates.
- Firm spring is identified as yellow.
- Future Shock-equipped bicycles can use different generations and cartridge configurations. A bike having Future Shock does not automatically mean this spring kit is compatible.
- Verify MPN S233100001 and your Future Shock generation before ordering.
Fine-Tune Your Future Shock 3.0
Future Shock performance depends in part on matching the spring configuration to the rider. Genuine Specialized S233100001 gives riders and mechanics all three factory spring options in one kit, making it possible to adjust the system without purchasing individual springs separately.
Whether replacing an original spring or changing the setup for rider weight and preferred suspension feel, this complete Soft, Medium, and Firm Future Shock 3.0 spring kit provides the factory components needed to properly tune a compatible cartridge.
Stage 21 Bikes carries genuine Specialized factory replacement and service parts to help keep current and previous-generation Specialized bikes properly maintained.