MICHELIN M14 Bib Mousse 140/80-18 Enduro Rear Insert
MICHELIN Bib Mousse M14 is a foam-based off-road inner insert that replaces the conventional inner tube in 140/80-18 rear tyres, providing a puncture-free solution for demanding enduro, rally and motocross use.
The technology delivers an air-pressure equivalent of around 0.9 bar, combining exceptional impact absorption with precise feedback on technical MICHELIN Bib Mousse concept has accumulated decades of top-level race success, including multiple Dakar Rally victories and world championship titles in enduro and motocross.
Key Features & Benefits
- Puncture-free foam construction – closed-cell mousse insert that cannot go flat, eliminating pinch flats and conventional punctures in off-road use.
- Dedicated 140/80-18 rear dimension – M14 reference matched to 140/80-18 rear tyres with 18 UHD Large profile for optimal fit and sidewall support.
- Optimised grip and handling – designed to work with MICHELIN off-road tyres to enhance traction, compliance and directional stability on roots, rocks and ruts.
- Lighter than reinforced inner tubes – reduces unsprung mass at the rear wheel, contributing to agile handling and improved suspension response.
- Competition-proven performance – developed for rally raid, enduro and MX racing, with a long record of success in the most demanding events worldwide.
- Consistent feel over rough terrain – stable pressure equivalent helps maintain predictable tyre behaviour through long special stages and hard enduro sections.
Typical Use Cases
- Modern enduro and hard enduro motorcycles using 140/80-18 rear tyres in technical singletrack, extreme climbs and rocky riverbeds.
- Rally and cross-country events where reliability and puncture resistance are critical over long special stages.
- Motocross and training on rough, stone-strewn or rooty tracks where conventional tubes are at high risk of damage.
- Holiday and adventure off-road riding where consistent traction and reduced puncture risk are prioritised.
Technical Specifications
| Manufacturer | MICHELIN |
| Product type | Foam Bib Mousse insert for off-road motorcycle tyres |
| Manufacturer reference | M14 Bib Mousse |
| SKU | 057337 |
| Wheel position | Rear |
| Compatible tyre size | 140/80-18 |
| UHD code | 18 UHD Large (Michelin UHD tube equivalence) |
| Approximate pressure equivalent | ≈ 0.9 bar (off-road use) |
| Recommended disciplines | Rally, enduro, motocross |
| Maximum recommended speed | Up to 129 km/h (80 mph), off-road use only |
| Road approval | Not approved for use on public roads (off-road competition and sport use only). |
Recommended Tyre Pairings (140/80-18)
The MICHELIN M14 Bib Mousse is engineered primarily for use with MICHELIN off-road rear tyres in size 140/80-18, where its shape and density are tuned to match the carcass combinations include MICHELIN Enduro Medium, Enduro Medium 2, Enduro Xtrem and Desert Race Baja in 140/80-18, as indicated in the manufacturer’s fitment tables.
The insert is specifically designed for MICHELIN tyres; performance in other tyre brands cannot be guaranteed by the manufacturer.
Installation & Service Life Notes
- Delivered as a complete kit including one MICHELIN Bib Mousse M14 insert, a dedicated Bib Mousse fitting gel, user instructions and a marked use-by date on the product.
- The dedicated gel reduces friction between mousse and tyre, helping to control operating temperature and extend service life.
- The manufacturer recommends first use within 18 months from the date of manufacture and use within approximately 6 months of initial fitting, depending on riding intensity and discipline.
- Service life is strongly influenced by factors such as bike power, rider level, terrain severity and whether the application is enduro, hard enduro, rally or motocross.
- Storage should avoid prolonged temperatures above 30 °C and any exposure above 40 °C, in order to preserve the mousse’s elastic properties.
- Before fast special stages, a progressive warm-up at moderate speed helps stabilise the mousse and tyre assembly for consistent feel.
With its dedicated 140/80-18 sizing, competition-developed foam construction and manufacturer-recommended combinations with leading MICHELIN enduro tyres, the MICHELIN M14 Bib Mousse provides a high-performance, puncture-free rear wheel solution for serious off-road riding and racing.
