Syncros Headset Plasma 5
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What this headset is
A Syncros integrated drop-in headset designed exclusively for:
- Scott Plasma 5
Brand: Syncros
Key Standards
- Top: IS31/25.4
- Bottom: IS41/30
- Fork steerer: 1" → 1 1/8" tapered
Meaning:
- Top bearing seat: 31 mm internal / 25.4 mm steerer (1")
- Bottom bearing seat: 41 mm internal / 30 mm crown race
- Very narrow top = classic TT/triathlon design
System type
- Fully integrated (IS) “drop-in” bearings
- Not pressed cups (not ZS/EC)
- Sealed cartridge bearings
- Aluminium construction
Why this headset is unusual
This is a triathlon-specific tapered system, and it differs from all your previous ones:
- Uses 1" upper steerer (rare in modern bikes)
- Bottom is IS41, but with a 30 mm crown race standard
- Designed for aerodynamic stiffness + clean front end integration
Comparison with your other headset systems
| System | Bike | Top | Bottom | Fork | Type |
|---|---|---|---|---|---|
| Plasma 5 | TT/Tri | IS31/25.4 | IS41/30 | 1" → 1 1/8" | IS |
| Foil 2023 | Road aero | IS44/35 | IS52/40 | 1" → 1.5" | IS |
| Scale/Spark | MTB | IS42/28.6 | IS52/40 | 1 1/8" → 1.5" | IS |
| Addict/Solace | Road | IS41/28.6 | IS46/34 | 1 1/8" → 1 1/4" | IS |
| ZS44/EC44 | Road/MTB | ZS44 | EC44 | 1 1/8" | Press-fit |
Key takeaway
This headset is:
- NOT compatible with Foil / Addict / Scale / Spark systems
- ❌ NOT interchangeable with any IS41/IS44/IS42 systems
- ✔️ ONLY for Plasma 5 frames
Even though it shares the “IS” name, the dimensions are completely unique.
Simple explanation
Think of it like this:
- IS44/52 systems → modern road & MTB
- IS41 systems → older road
- IS42 systems → older MTB
- IS31/41 system → TT-specific (Plasma 5 only)
When you should use it
Only if your bike is:
- Scott Plasma 5
- And your current headset markings match:
- IS31/25.4 (top)
- IS41/30 (bottom)
