MICHELIN Bib Mousse M14X 140/80-18 Enduro Xtrem NHS – Rear Off-Road Foam Insert
The MICHELIN Bib Mousse M14X is a dedicated rear foam insert engineered for 140/80-18 enduro tires, replacing the traditional inner tube to virtually eliminate punctures in off-road competition is tuned for low-pressure feel, delivering an equivalent pressure of around 0.9 bar (~13 psi) for outstanding traction and comfort over rough terrain.
This specific M14X version is optimized for the MICHELIN ENDURO XTREM NHS rear tire in size 140/80-18, in the 18 UHD Large format, offering a matched solution for hard and extreme enduro riders who demand grip, support and consistency in the most technical conditions.
Key Features & Benefits
- Puncture-eliminating foam insert: Closed-cell foam construction replaces the inner tube between rim and tire, so there is no air pressure to lose from punctures during off-road riding.
- Consistent low-pressure feel: Provides a stable, cushioned feel equivalent to approximately 0.9 bar (~13.05 psi), enhancing traction and control on rocks, roots and slippery climbs.
- Enduro Xtrem-specific fitment: Dimensioned as 18 UHD Large and specified for the MICHELIN ENDURO XTREM NHS rear tire in 140/80-18, ensuring precise fit and balanced carcass support for that tire.
- Designed for competition off-road use: Intended for Rally, Enduro and MX disciplines, particularly hard and extreme enduro events where maximum grip and impact absorption are critical.
- Lightweight versus reinforced tubes: Lighter than many ultra heavy-duty inner tubes while retaining high resistance to deformation and pinch-type damage.
- Longevity with dedicated gel: Developed to work with MICHELIN Bib Mousse Gel, which helps control operating temperature and extend service life when correctly applied.
- Premium motorsport pedigree: Part of the Bib Mousse family that has accumulated numerous wins in rally raid, Enduro and MX world-level competition since its introduction.
Technical Specifications
| Manufacturer | MICHELIN |
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| Product type | Rear foam mousse insert for off-road motorcycle tire |
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| Model designation | MICHELIN Bib Mousse M14X |
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| SKU / Article number | 156631 |
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| Tire compatibility (primary) | MICHELIN ENDURO XTREM NHS rear tire |
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| Recommended tire size | 140/80-18 |
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| Rim diameter | 18 inch (rear) |
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| UHD format | 18 UHD Large |
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| Nominal pressure feel | Approx. 0.9 bar (~13.05 psi) equivalent |
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| Construction | Closed-cell foam insert (solid mousse, no air chamber) |
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| Use category | Off-road competition (Rally, Enduro, MX) |
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| Homologation | NHS – Not for Highway Service, not approved for public road use |
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| Recommended maximum speed | Up to around 80 mph (129 km/h) in off-road use with Bib Mousse fitted |
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Typical Use Cases
The MICHELIN Bib Mousse M14X is tailored for demanding off-road riders and competitors looking for a zero-puncture solution and very high grip in technical terrain:
- Hard / Extreme Enduro stages: Steep, rocky climbs, wet roots, steps and trial-like sections where consistent low-pressure behavior and strong sidewall support are essential.
- Classic enduro special tests: Forest, singletrack and cross tests where predictable grip over long days is needed without worrying about pinch flats.
- Rally and cross-country racing: Stages that mix rocky tracks, ruts and fast sections, where the mousse’s resistance to punctures and controlled deformation are beneficial.
- Training for competition riders: Regular use in race-like conditions with the ENDURO XTREM 140/80-18 tire to replicate race setup and feedback.
Packaging Contents
Each MICHELIN Bib Mousse M14X package typically includes:
- One MICHELIN Bib Mousse M14X rear foam insert (140/80-18, 18 UHD Large)
- One tube of MICHELIN Bib Mousse fitting gel to help maximize lifespan and performance
- Usage and fitting instructions
- MICHELIN branding stickers and use-by information
Usage Notes
- Off-road only: Classified as NHS, intended exclusively for off-road riding and competition, not for public roads.
- Optimized for MICHELIN tires: Designed to be used inside MICHELIN off-road ranges, with this M14X model specifically paired with the ENDURO XTREM NHS 140/80-18 rear tire.
- Correct gel application: Performance and durability depend on using MICHELIN Bib Mousse Gel during mounting and whenever the mousse is removed and refitted.
- Temperature and service life: Service life varies according to discipline and riding intensity; higher loads and temperatures in disciplines like motocross tend to reduce longevity compared with enduro use.
