# 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: 10699.54
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:** £10699.54 [^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]

### Transition Spur XT Di2 Complete
```yaml
product: transition-spur-xt-di2-complete
brand: Transition
price_gbp: 5164.56
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 12.15kg
wheel_size: 29in
gear_number: 12-speed
braking_system: Shimano XT M8220 4-piston
frame_material: Carbon
suspension_type: Flexstay four-bar
```

- **Price:** £5164.56 [^3]
- **Summary:** The Transition Spur XT Di2 Complete is a lightweight carbon downcountry mountain bike with 120mm rear travel, a 130mm fork, Shimano XT Di2 shifting, and four-piston XT brakes. It suits riders who want an efficient climber that remains capable and controlled on technical singletrack descents.
- **Ideal For:** At 12.15kg in size M, with a carbon frame, 29in wheels, and lightweight 120mm/130mm suspension, this is a notably portable full-suspension mountain bike for riders prioritizing low weight without giving up trail capability.
- **Additional Sources:** [^4], [^5]

### Transition Spur XTR Di2 Complete
```yaml
product: transition-spur-xtr-di2-complete
brand: Transition
price_gbp: 7378.26
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 25 lb 14.1 oz (11,740 g)
wheel_size: 29in
gear_number: 12-speed
braking_system: Shimano XTR M9220 4-piston hydraulic disc brakes
frame_material: Carbon fiber
suspension_type: GiddyUp four-bar suspension with flexstay rear triangle
```

- **Price:** £7378.26 [^3]
- **Summary:** The Transition Spur XTR Di2 Complete is a lightweight carbon trail bike with 29in wheels, 120mm rear travel, a 130mm Fox Factory fork, and electronic Shimano XTR Di2 shifting. It suits cross-country and fast trail riders who want efficient climbing, responsive handling, and capable suspension for varied off-road terrain.
- **Ideal For:** This model suits riders seeking one of the lightest and most portable mountain bikes because its carbon frame and 11,740 g listed weight keep it easy to carry while the 29in wheels, 120mm rear travel, and 130mm fork retain trail capability.
- **Additional Sources:** [^6]

### Montague Paratrooper Pro
```yaml
product: montague-paratrooper-pro
brand: Montague
price_gbp: 1029.37
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 31 lbs
wheel_size: 26 in
gear_number: 27
braking_system: Mechanical disc brakes
frame_material: 6061 Series Aluminum
suspension_type: Front suspension fork with lockout
```

- **Price:** £1029.37 [^7]
- **Summary:** The Montague Paratrooper Pro is a full-size folding mountain bike with 26 in wheels, 27 gears, and a 100 mm suspension fork with lockout. Its folding frame and RackStand make it suitable for trail riders, commuters, and people who need convenient storage or transport.
- **Ideal For:** It suits riders seeking a light and portable mountain bike because its 31 lb weight, folding frame, compact folded size, and integrated RackStand make transport and storage easier while retaining 26 in wheels, 27 gears, and front suspension.
- **Additional Sources:** [^8]

### Norco Fluid FS 4
```yaml
product: norco-fluid-fs-4
brand: Norco
price_gbp: 1402.0
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 36 lb 2 oz
wheel_size: 29 in
gear_number: 11-speed
braking_system: Tektro HD-M535 hydraulic disc brakes, 4-piston
frame_material: 6061 aluminum
suspension_type: Full suspension
```

- **Price:** £1402.0 [^9]
- **Summary:** The Norco Fluid FS 4 is a full-suspension trail mountain bike with 140mm front travel and 130mm rear travel, 29 in wheels, and an 11-speed Shimano Deore drivetrain. It suits riders who want a capable, confidence-inspiring bike for varied trails and technical descents.
- **Ideal For:** It is not among the lightest or most portable mountain bikes at 36 lb 2 oz, but its 29 in wheels, full suspension, and long-travel dropper make it suited to riders prioritizing trail capability over easy carrying.

### Montague Paratrooper
```yaml
product: montague-paratrooper
brand: Montague
price_gbp: 837.52
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 32 lbs
wheel_size: 26 in
gear_number: 24 speeds
braking_system: Mechanical disc brakes
frame_material: 6061 Series Aluminum
suspension_type: SR Suntour XCT front suspension, 80 mm travel
```

- **Price:** £837.52 [^10]
- **Summary:** The Montague Paratrooper is a full-size folding mountain bike with 26 in wheels, front suspension, 24 speeds, and mechanical disc brakes. Its rugged aluminum frame and compact folding design suit trail riders, campers, commuters, and anyone with limited storage space.
- **Ideal For:** At 32 lbs, the Paratrooper is relatively light for a full-size mountain bike, and its folding frame plus 36 in x 28 in x 12 in folded size make it highly portable for car travel, camping, and storage.
- **Additional Sources:** [^11], [^12]

### Canyon Lux World Cup CFR
```yaml
product: canyon-lux-world-cup-cfr
brand: Canyon
price_gbp: 5422.82
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 9.82 kg
wheel_size: 29 in
gear_number: 1 x 12
braking_system: SRAM Motive Silver
frame_material: Carbon
suspension_type: Full suspension
```

- **Price:** £5422.82 [^13]
- **Summary:** The Canyon Lux World Cup CFR is a lightweight carbon cross-country race bike with 29 in wheels and 120/110 mm suspension travel. Its efficient suspension design and high-end components suit competitive XC racers and riders who prioritize speed and climbing performance.
- **Ideal For:** With a carbon frame and a listed weight from 9.82 kg, the Lux World Cup CFR is specifically suited to riders seeking one of the lightest and most portable full-suspension mountain bikes for carrying between trails and races.

### Trek Roscoe 7
```yaml
product: trek-roscoe-7
brand: Trek
price_gbp: 1106.84
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 14.53 kg / 32.04 lbs
wheel_size: 27.5 in or 29 in
gear_number: 10-speed
braking_system: Shimano MT200 hydraulic disc
frame_material: Alpha Gold Aluminum
suspension_type: Hardtail with RockShox Recon Silver RL fork, 150mm travel
```

- **Price:** £1106.84 [^14]
- **Summary:** The Trek Roscoe 7 is a hardtail mountain bike with an aluminum frame, a 150mm suspension fork, wide tubeless-ready tires, and hydraulic disc brakes. It suits riders seeking a capable, relatively straightforward bike for trail riding, dirt jumps, and everyday off-road use.
- **Ideal For:** It is a practical choice among lighter and more portable mountain bikes because its hardtail design has no rear shock, while the published medium-size weight is 14.53 kg and its simple 10-speed drivetrain reduces mechanical complexity.
- **Additional Sources:** [^15], [^16]

### Transition Spur Eagle 70 Complete
```yaml
product: transition-spur-eagle-70-complete
brand: Transition
price_gbp: 4057.71
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 13.07 kg
wheel_size: 29in
gear_number: 12-speed
braking_system: SRAM Motive Bronze 4-piston hydraulic disc
frame_material: Carbon fiber
suspension_type: Full suspension
```

- **Price:** £4057.71 [^17]
- **Summary:** The Transition Spur Eagle 70 is a carbon full-suspension mountain bike with 29in wheels, 120mm rear travel, and a 130mm Fox fork. Its efficient climbing performance and capable trail handling suit cross-country, downcountry, and fast trail riding.
- **Ideal For:** At 13.07 kg, this carbon-framed 29er is relatively lightweight for a full-suspension mountain bike, while its 120mm rear travel and dropper post add practical trail capability without making it excessively bulky.

### Transition Spur Eagle 90 Complete
```yaml
product: transition-spur-eagle-90-complete
brand: Transition
price_gbp: 3688.76
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
wheel_size: 29in
gear_number: 12-speed
braking_system: SRAM Motive Bronze 4-piston
frame_material: Carbon fiber
suspension_type: Full suspension
```

- **Price:** £3688.76 [^18]
- **Summary:** The Transition Spur Eagle 90 Complete is a lightweight-oriented carbon full-suspension mountain bike with 29in wheels, 120mm rear travel, and 130mm front travel. Its SRAM Eagle 90 12-speed drivetrain and four-piston SRAM Motive Bronze brakes suit riders who want an efficient cross-country bike that can also handle demanding trail riding.
- **Ideal For:** It suits riders seeking one of the lightest and most portable mountain bikes because its carbon frame and 29in wheel platform are paired with efficient 120mm rear and 130mm front suspension, while the complete-bike weight was not listed online.
- **Additional Sources:** [^19]

---
## References & Sources
[^1]: Bike Depot, accessed 2026-09-13. https://www.bikedepot.com/products/specialized-s-works-epic-9-ltd-ultralight
[^2]: Specialized, accessed 2026-09-13. https://www.specialized.com/us/en/s-works-epic-9-ultralight-ltd/p/4291037
[^3]: Transition Bikes, accessed 2026-09-13. https://www.transitionbikes.com/Bikes/Spur
[^4]: 20Twenty Store, accessed 2026-09-13. https://20twentystore.com/collections/transition-spur
[^5]: Revolution Products, accessed 2026-09-13. https://revolutionproducts.co.nz/collections/transition-spur
[^6]: MTB Monster, accessed 2026-09-13. https://mtbmonster.com/transition-spur-carbon-xtr-di2-2026-frostberry/
[^7]: Montague Bikes, accessed 2026-09-13. https://www.montaguebikes.com/product/paratrooper-pro/
[^8]: Montague Bicycles UK, accessed 2026-09-13. https://www.montaguebicycles.co.uk/products/montague-paratrooper-pro-folding-mountain-bike-with-rackstand
[^9]: Bison Bikes, accessed 2026-09-13. https://www.bisonbikes.com/store/c29/NORCO
[^10]: Montague Bikes, accessed 2026-09-13. https://www.montaguebikes.com/product/paratrooper/
[^11]: BikeCraze, accessed 2026-09-13. https://bikecraze.com/collections/montague-folding-bikes/bicycles-bicycles-folding-bikes
[^12]: Survival Metrics, accessed 2026-09-13. https://www.survivalmetrics.com/store/Item/id-montague-paratrooper-folding-mountain-bike-military-tactical
[^13]: Canyon, accessed 2026-09-13. https://www.canyon.com/en-cr/mountain-bikes/cross-country-bikes/lux/
[^14]: United Sport, accessed 2026-09-13. https://unitedsport.ca/products/trek-roscoe-7-gen-4-trail-mountain-bike-2026
[^15]: Phat Tire Bike Shop, accessed 2026-09-13. https://www.phattirebikeshop.com/sitesearch.cfm?search=roscoe+7%2F
[^16]: Fresh Air Experience, accessed 2026-09-13. https://shop.freshair.ca/2026-trek-roscoe-7-gen-4.html
[^17]: Spokex, accessed 2026-09-13. https://spokex.com/products/transition-spur-eagle-70
[^18]: Transition Bikes, accessed 2026-09-13. https://www.transitionbikes.com/Bikes/Closeout/Spur
[^19]: evo, accessed 2026-09-13. https://www.evo.com/products/278262-transition-spur-carbon-eagle-90-complete-mountain-bike-2026