MICHELIN Bib Mousse M16 90/100-21 Front Insert
MICHELIN Bib Mousse M16 is a foam insert for 21-inch off-road front tires in size 90/100-21, engineered to replace the traditional inner tube and virtually eliminate punctures in enduro, rally and motocross use.
Key features and benefits
- Anti-puncture foam insert that cannot deflate, providing continuous riding even after sharp impacts or cuts to the tire carcass.
- Lighter than an ultra heavy duty inner tube, reducing unsprung mass for more responsive suspension and steering.
- Pressure equivalence of approximately 0.9 bar (around 13 psi), delivering a large contact patch and consistent traction on loose and technical terrain.
- Developed to enhance grip and handling when used inside MICHELIN off-road tires, especially in demanding competition conditions.
- Proven technology with a long record of success in rally raid, enduro and motocross world championships.
Technical specifications
| Brand | MICHELIN |
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| Product type | Bib Mousse foam insert for off-road motorcycle front tire |
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| Michelin code | M16 |
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| Reference number (SKU) | 338000 |
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| Nominal tire size | 90/100-21 front |
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| Inner tube equivalence | Replaces 21 UHD reinforced inner tube |
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| Pressure equivalence | Approx. 0.9 bar (13 psi) |
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| Intended disciplines | Enduro, rally, cross-country, motocross |
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| Maximum recommended speed | Up to 80 mph (approx. 129–130 km/h) |
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| Road approval | NHS – Not for Highway Service, off-road use only |
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Recommended applications
This MICHELIN Bib Mousse M16 is designed for competition and intensive off-road use where puncture resistance, consistent grip and predictable handling are applications include:
- Enduro special tests with roots, rocks and sharp-edged obstacles.
- Rally and cross-country stages over long distances and mixed terrain.
- Motocross tracks with jump landings and heavy braking zones that stress the front tire.
- Extreme enduro events where a damaged tube would normally lead to immediate retirement.
Michelin tire compatibility (selection)
According to MICHELIN fitment documentation, the Bib Mousse M16 is intended for use with selected MICHELIN 21-inch off-road front tires in the following ranges and sizes:
| Brand | Model | Year |
|---|
| MICHELIN | StarCross 5 Soft (90/100-21 front) | – |
| MICHELIN | StarCross 5 Medium (90/100-21 front) | – |
| MICHELIN | StarCross 5 Hard (90/100-21 front) | – |
| MICHELIN | Enduro Medium (90/90-21 front) | – |
| MICHELIN | Desert Race (90/90-21 front) | – |
Usage notes
- Designed exclusively for MICHELIN brand off-road tires with the recommended dimensions.
- Requires the use of MICHELIN Bib Mousse Gel during mounting and at each tire change to control operating temperature and extend service life.
- Recommended to be first put into service within 18 months of manufacture and used for up to around 6 months after initial fitting, depending on riding intensity and discipline.
- Should not be stored for long periods above approximately 30 °C, and exposure to temperatures above about 40 °C should be avoided.
