# What are the lightest and most portable mountain bikes available? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the lightest and most portable mountain bikes available?

## Products

### Specialized S-Works Epic 9 Ultralight LTD
```yaml
product: specialized-s-works-epic-9-ultralight-ltd
brand: Specialized
price_gbp: 10818.53
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 8.56 kg
wheel_size: 29 in
gear_number: 12-speed
braking_system: TRICKSTUFF Piccola 2-piston
frame_material: S-Works FACT 12m Carbon
suspension_type: Full suspension (RockShox SID SL Ultimate front, RockShox SIDLuxe Ultimate rear)
```

- **Price:** £10818.53 [^1]
- **Summary:** A feather‑light, race‑focused full‑suspension XC bike built on a S‑Works FACT 12m carbon frame with 110mm front/rear travel (size M) and high‑end RockShox SL suspension, lightweight Roval wheels, SRAM XX SL drivetrain, and Trickstuff Piccola brakes. It targets elite cross‑country racers seeking the lightest production full‑suspension bike for maximum acceleration and efficiency. The production weight is about 8.56 kg (size M).
- **Ideal For:** Ideal for riders seeking the lightest and most portable mountain bikes because it uses a 1.589 g S‑Works FACT 12m carbon frame and a complete build weight of about 8.56 kg, minimizing mass for transport and fast acceleration.
- **Additional Sources:** [^2], [^1], [^2]

---
## References & Sources
[^1]: Specialized, accessed 2026-06-14. https://www.specialized.com/us/en/s-works-epic-9-ultralight-ltd/p/4291037
[^2]: Bike Depot, accessed 2026-06-14. https://www.bikedepot.com/products/specialized-s-works-epic-9-ltd-ultralight