The Motobike Mas 90/90-21 off-road motorcycle mousse insert is a nitrile rubber foam tire insert for enduro & MX front wheels. Standard fitment for full-size dirt bikes. Eliminates front pinch flats, reduces rotating mass. B2B wholesale from Tianjin, China.
| 1.1 バー | 最適なスピード性能 |
|---|---|
| 0.8バール | 砂漠、草原、ゴビ地帯に最適 |
| 0.5バール | 森林トレイルに最適 |
| 0.3バール | テクニカルなオフロード走行のためのエクストリーム・エンデューロ・ムース |
The Motobike Mas 90/90-21 off-road motorcycle mousse insert is a professional-grade closed-cell nitrile rubber foam tire insert engineered for the front wheels of enduro, motocross, and off-road motorcycles. The 90/90-21 is the standard front wheel size for virtually all full-size dirt bikes — making this mousse one of the most widely compatible front-end protection solutions in off-road racing.
This front mousse insert completely replaces the inner tube to eliminate dangerous front pinch flats, reduce unsprung rotating mass, and deliver consistent steering precision across the most demanding terrain. Available in soft, medium, and standard density formulations, the 90/90-21 mousse fits all standard full-size dirt bike front wheels.
中国・天津を拠点とするB2BメーカーであるMotobike Masは、世界中のディーラー、販売代理店、レースチーム向けに、OEMによるプライベートブランド製品、カスタマイズされた硬度配合、および工場直販の卸売価格を提供しています。.
| サイズ | 90/90-21 |
| 適合 | 90/90-21 front tires (standard full-size MX/enduro front wheel) |
| 素材 | 独立気泡ニトリルゴムフォーム |
| 密度のオプション | ソフト、ミディアム、スタンダード |
| 重量 | Approx. 1.0-1.2 kg |
| 回転質量の低減 | 最大40% 対 チューブ＋ヘビーデューティー・リムロック |
| 有効圧力相当値 | 8～12 psi |
| 耐用年数 | 通常、200～500レーシングマイル |
| 原産国 | 中国・天津 |
A front tire flat at speed is the most dangerous failure in off-road motorcycling — it causes immediate loss of steering control. The 90/90-21 front mousse eliminates this risk entirely. No pinch flats from square-edge log impacts, no puncture flats from rocks and thorns, no valve stem failures. For enduro racers navigating technical terrain and motocross racers landing heavy jumps, this means no DNFs from front-end failures.
Reducing unsprung rotating mass on the 21-inch front wheel dramatically improves steering response and suspension compliance. By eliminating the inner tube and allowing a lighter rim lock, the 90/90-21 front mousse reduces front wheel rotating mass by up to 40%. The result: lighter steering effort, reduced deflection off roots and rocks, and more precise front-end feedback.
Unlike pneumatic tires where front tire pressure changes with temperature, altitude, and riding time, a mousse insert delivers identical damping and steering characteristics from the first corner to the last. For enduro riders covering varied terrain over hours of racing, this predictability is invaluable for maintaining consistent corner entry speed and line choice.
The 90/90-21 front mousse allows riders to run effective pressures as low as 8 psi with zero risk of pinch flats. On loose over hardpack, wet roots, and sandy sections, this translates to significantly more front-end grip and confidence in corner entry. The foam absorbs square-edge impacts that would instantly collapse a tube at low pressure.
Once installed, the front mousse requires zero maintenance for the life of the tire. No air pressure checks before practice or race starts, no valve stem inspections, no gauges or pumps. For race teams managing multiple bikes and enduro riders preparing for long events, this simplifies preparation and eliminates one more variable.
Selecting the correct mousse hardness for the 90/90-21 front wheel is critical for both performance and safety. The wrong density can cause vague steering, excessive deflection, or premature wear.
| 密度 | 有効圧力 | 最適な地形 | ライダーの体重 |
|---|---|---|---|
| ソフト | 8～10 psi | Mud, sand, wet roots, slippery conditions | 70kg未満 |
| ミディアム | 9～11 psi | Mixed terrain, enduro, all-around use | 70～90 kg |
| 標準 | 10～12 psi | Rocky, hard-packed, desert, high-speed | 90kg以上 |
This 90/90-21 mousse insert fits all standard 90/90-21 front tires — the industry-standard front tire size for full-size off-road motorcycles. It is compatible with virtually all full-size dirt bikes from every major manufacturer.
| 因子 | Front Mousse Insert (90/90-21) | Front Inner Tube |
|---|---|---|
| Flat prevention | 100% — no front flats possible | Vulnerable to pinch flats, especially on log impacts |
| Steering precision | Consistent throughout race | Changes with pressure and temperature |
| Maintenance | Zero — install and forget | Check pressure before every ride |
| Rotating mass | Lower (no tube + lighter rim lock) | Higher |
| Safety | No sudden steering loss | Sudden control loss on front flat |
| Installation | Moderate difficulty | Easier |
| Terrain adaptability | Fixed by density choice | Adjustable via pressure |
| Reusability | Transfer to new tire (if in good condition) | Replace each tire change |
| 仕様 | 90/90-21 | 80/100-21 |
|---|---|---|
| セクション幅 | 90 mm | 80 mm |
| アスペクト比 | 90% (taller sidewall) | 100% (taller profile overall) |
| 全径 | 少し大きい | 少し小さい |
| Typical Application | Enduro, trail, off-road | Motocross, supercross |
| ステアリングの感触 | More front-end grip, slightly heavier steering | Lighter steering, faster turn-in |
| 最適な地形 | Loose, soft, technical enduro | Hard-packed, berms, deep loam |
A 90/90-21 front mousse insert typically lasts between 200 and 500 racing miles, depending on terrain, rider weight, riding speed, and lubrication during installation. Front mousses generally wear more slowly than rear units due to lower heat generation from braking loads compared to the driving loads on a rear wheel.
重要： Never use petroleum-based lubricants on mousse inserts — they degrade nitrile rubber. Use only water-based mousse lubricant. Proper seating is especially critical on 21-inch front wheels where any imbalance will be felt through the handlebars at speed.
Motobike Masは、中国・天津を拠点とする、オフロードバイク用レースタイヤ向けムースインサートのメーカーです。当社は、世界中のディーラー、販売代理店、レースチーム、アフターマーケットブランドに対し、メーカー直販価格と完全なカスタマイズサービスを提供しています。.
| メーカー直販価格 | 直接卸売 — 中間業者なし |
| OEM／プライベートブランド | カスタマイズされたブランドデザイン、パッケージ、およびカラー |
| カスタム配合 | 密度や材料特性を調整し、フロント固有の配合を含める |
| 最小発注数量（MOQ） | 最低注文数量に関するお問い合わせ |
| 配送 | 海上輸送（FOB天津）、航空輸送、DDPも対応可能 |
| サンプル | 評価用の試作サンプル |
90/90-21 is a front wheel tire size — the industry standard front tire for virtually all full-size motocross and enduro motorcycles. The 21-inch diameter rim is universal across 250cc and 450cc dirt bike classes from every major manufacturer.
The 90/90-21 has a 90 mm section width with a 90% aspect ratio, while the 80/100-21 has an 80 mm width with a 100% aspect ratio. The 90/90-21 offers slightly more front-end grip and a slightly larger overall diameter, making it popular for enduro and off-road riding. The 80/100-21 provides lighter steering feel and is more common in motocross.
Typically 200-500 racing miles. Front mousses often last longer than rear units because they generate less heat under braking compared to the driving loads on a rear mousse.
If your motorcycle has a 21-inch front wheel and uses 90/90-21 front tires, this mousse will fit. This covers virtually all full-size motocross and enduro bikes from Honda, Yamaha, Kawasaki, Suzuki, KTM, Husqvarna, GasGas, Beta, Sherco, and more.
Yes. Many enduro and trail riders choose a mousse for the front wheel for safety and consistency while running a tube on the rear. However, running mousse on both wheels provides the best overall performance and flat protection.
はい。B2Bのお客様は、大量注文を確定する前に、評価用のサンプルをご請求いただけます。サンプルの発送手配については、弊社営業チームまでお問い合わせください。.
標準的なOEM生産の場合、数量やカスタマイズ要件にもよりますが、通常、リードタイムは15～30日程度です。.
