{"id":640,"date":"2026-05-25T02:14:54","date_gmt":"2026-05-25T02:14:54","guid":{"rendered":"http:\/\/motobikemas.com\/product\/90-90-21-off-road-motorcycle-mousse-insert-enduro-front-tires\/"},"modified":"2026-05-27T04:21:15","modified_gmt":"2026-05-27T04:21:15","slug":"90-90-21-off-road-motorcycle-mousse-insert-enduro-front-tires","status":"publish","type":"product","link":"https:\/\/motobikemas.com\/ja\/product\/90-90-21-off-road-motorcycle-mousse-insert-enduro-front-tires\/","title":{"rendered":"90\/90-21 \u30aa\u30d5\u30ed\u30fc\u30c9\u30e2\u30fc\u30bf\u30fc\u30b5\u30a4\u30af\u30eb\u7528\u30a8\u30f3\u30c7\u30e5\u30fc\u30ed\uff06MX\u30d5\u30ed\u30f3\u30c8\u30bf\u30a4\u30e4\u7528\u30e0\u30fc\u30b9\u30a4\u30f3\u30b5\u30fc\u30c8"},"content":{"rendered":"<h2>Professional 90\/90-21 Off-Road Motorcycle Mousse Insert for Enduro &amp; Motocross Front Wheels<\/h2>\n<p>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 \u2014 making this mousse one of the most widely compatible front-end protection solutions in off-road racing.<\/p>\n<p>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.<\/p>\n<p>As a Tianjin, China-based B2B manufacturer, Motobike Mas offers OEM private labeling, custom hardness formulations, and direct factory wholesale pricing for dealers, distributors, and race teams worldwide.<\/p>\n<hr \/>\n<h2>\u6280\u8853\u4ed5\u69d8<\/h2>\n<table>\n<tbody>\n<tr>\n<td><strong>Size<\/strong><\/td>\n<td>90\/90-21<\/td>\n<\/tr>\n<tr>\n<td><strong>Fitment<\/strong><\/td>\n<td>90\/90-21 front tires (standard full-size MX\/enduro front wheel)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u7d20\u6750<\/strong><\/td>\n<td>Closed-cell nitrile rubber foam<\/td>\n<\/tr>\n<tr>\n<td><strong>Density Options<\/strong><\/td>\n<td>Soft, Medium, Standard<\/td>\n<\/tr>\n<tr>\n<td><strong>Weight<\/strong><\/td>\n<td>Approx. 1.0-1.2 kg<\/td>\n<\/tr>\n<tr>\n<td><strong>Rotating Mass Reduction<\/strong><\/td>\n<td>Up to 40% vs. tube + heavy-duty rim lock<\/td>\n<\/tr>\n<tr>\n<td><strong>Effective Pressure Equivalent<\/strong><\/td>\n<td>8-12 psi<\/td>\n<\/tr>\n<tr>\n<td><strong>Service Life<\/strong><\/td>\n<td>200-500 racing miles typical<\/td>\n<\/tr>\n<tr>\n<td><strong>Country of Origin<\/strong><\/td>\n<td>Tianjin, China<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>Key Benefits<\/h2>\n<h3>Complete Front Flat Prevention<\/h3>\n<p>A front tire flat at speed is the most dangerous failure in off-road motorcycling \u2014 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.<\/p>\n<h3>Reduced Front Rotating Mass<\/h3>\n<p>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.<\/p>\n<h3>Consistent Steering Precision<\/h3>\n<p>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.<\/p>\n<h3>Lower Front Effective Pressure for Maximum Grip<\/h3>\n<p>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.<\/p>\n<h3>Zero Front Tire Maintenance<\/h3>\n<p>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.<\/p>\n<hr \/>\n<h2>Hardness Options Guide<\/h2>\n<p>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.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Density<\/th>\n<th>Effective Pressure<\/th>\n<th>Best Terrain<\/th>\n<th>Rider Weight<\/th>\n<\/tr>\n<tr>\n<td><strong>\u30bd\u30d5\u30c8<\/strong><\/td>\n<td>8-10 psi<\/td>\n<td>Mud, sand, wet roots, slippery conditions<\/td>\n<td>Under 70 kg<\/td>\n<\/tr>\n<tr>\n<td><strong>\u30df\u30c7\u30a3\u30a2\u30e0<\/strong><\/td>\n<td>9-11 psi<\/td>\n<td>Mixed terrain, enduro, all-around use<\/td>\n<td>70-90 kg<\/td>\n<\/tr>\n<tr>\n<td><strong>Standard<\/strong><\/td>\n<td>10-12 psi<\/td>\n<td>Rocky, hard-packed, desert, high-speed<\/td>\n<td>Over 90 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Selection Guide for 90\/90-21 Front Mousse<\/h3>\n<ul>\n<li><strong>Choose Soft<\/strong> for enduro riding in wet or technical conditions where maximum front-end traction is needed. Best for lighter riders and extreme enduro applications.<\/li>\n<li><strong>Choose Medium<\/strong> as the default all-rounder for most conditions \u2014 offers the best balance of steering precision and bump absorption for the majority of riders.<\/li>\n<li><strong>Choose Standard<\/strong> for high-speed desert racing, rocky enduro, motocross on hard-packed tracks, or heavier riders who need more front-end support under hard braking.<\/li>\n<\/ul>\n<hr \/>\n<h2>\u4e92\u63db\u6027<\/h2>\n<p>This 90\/90-21 mousse insert fits all standard 90\/90-21 front tires \u2014 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.<\/p>\n<h3>Motocross Bikes (250cc)<\/h3>\n<ul>\n<li>Honda CRF250R<\/li>\n<li>Yamaha YZ250F<\/li>\n<li>KTM 250 SX-F<\/li>\n<li>Husqvarna FC 250<\/li>\n<li>Kawasaki KX250<\/li>\n<li>Suzuki RM-Z250<\/li>\n<li>GasGas MC 250F<\/li>\n<\/ul>\n<h3>Motocross Bikes (450cc)<\/h3>\n<ul>\n<li>Honda CRF450R<\/li>\n<li>Yamaha YZ450F<\/li>\n<li>KTM 450 SX-F<\/li>\n<li>Husqvarna FC 450<\/li>\n<li>Kawasaki KX450<\/li>\n<li>Suzuki RM-Z450<\/li>\n<\/ul>\n<h3>Enduro \/ Cross-Country \/ Dual-Sport<\/h3>\n<ul>\n<li>KTM 300 XC-W \/ 350 EXC-F \/ 500 EXC-F<\/li>\n<li>Husqvarna TE 300 \/ FE 350 \/ FE 501<\/li>\n<li>Beta RR 300 \/ RR 350 \/ RR 430 \/ RR 480<\/li>\n<li>Sherco SE 300 \/ SE 500 \/ SE 700<\/li>\n<li>GasGas EC 250 \/ EC 300<\/li>\n<li>Honda CRF450X \/ CRF450RL<\/li>\n<li>Yamaha WR250F \/ WR450F<\/li>\n<li>Suzuki RMX450Z<\/li>\n<\/ul>\n<hr \/>\n<h2>Front Mousse vs. Front Inner Tube \u2014 Comparison<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Factor<\/th>\n<th>Front Mousse Insert (90\/90-21)<\/th>\n<th>Front Inner Tube<\/th>\n<\/tr>\n<tr>\n<td><strong>Flat prevention<\/strong><\/td>\n<td>100% \u2014 no front flats possible<\/td>\n<td>Vulnerable to pinch flats, especially on log impacts<\/td>\n<\/tr>\n<tr>\n<td><strong>Steering precision<\/strong><\/td>\n<td>Consistent throughout race<\/td>\n<td>Changes with pressure and temperature<\/td>\n<\/tr>\n<tr>\n<td><strong>Maintenance<\/strong><\/td>\n<td>Zero \u2014 install and forget<\/td>\n<td>Check pressure before every ride<\/td>\n<\/tr>\n<tr>\n<td><strong>Rotating mass<\/strong><\/td>\n<td>Lower (no tube + lighter rim lock)<\/td>\n<td>Higher<\/td>\n<\/tr>\n<tr>\n<td><strong>Safety<\/strong><\/td>\n<td>No sudden steering loss<\/td>\n<td>Sudden control loss on front flat<\/td>\n<\/tr>\n<tr>\n<td><strong>Installation<\/strong><\/td>\n<td>Moderate difficulty<\/td>\n<td>Easier<\/td>\n<\/tr>\n<tr>\n<td><strong>Terrain adaptability<\/strong><\/td>\n<td>Fixed by density choice<\/td>\n<td>Adjustable via pressure<\/td>\n<\/tr>\n<tr>\n<td><strong>Reusability<\/strong><\/td>\n<td>Transfer to new tire (if in good condition)<\/td>\n<td>Replace each tire change<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>90\/90-21 vs. 80\/100-21 \u2014 Choosing the Right Front Mousse Size<\/h2>\n<table>\n<tbody>\n<tr>\n<th>\u4ed5\u69d8<\/th>\n<th>90\/90-21<\/th>\n<th>80\/100-21<\/th>\n<\/tr>\n<tr>\n<td><strong>Section Width<\/strong><\/td>\n<td>90 mm<\/td>\n<td>80 mm<\/td>\n<\/tr>\n<tr>\n<td><strong>Aspect Ratio<\/strong><\/td>\n<td>90% (taller sidewall)<\/td>\n<td>100% (taller profile overall)<\/td>\n<\/tr>\n<tr>\n<td><strong>Overall Diameter<\/strong><\/td>\n<td>Slightly larger<\/td>\n<td>Slightly smaller<\/td>\n<\/tr>\n<tr>\n<td><strong>Typical Application<\/strong><\/td>\n<td>Enduro, trail, off-road<\/td>\n<td>Motocross, supercross<\/td>\n<\/tr>\n<tr>\n<td><strong>Steering Feel<\/strong><\/td>\n<td>More front-end grip, slightly heavier steering<\/td>\n<td>Lighter steering, faster turn-in<\/td>\n<\/tr>\n<tr>\n<td><strong>Best Terrain<\/strong><\/td>\n<td>Loose, soft, technical enduro<\/td>\n<td>Hard-packed, berms, deep loam<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>Maintenance and Service Life<\/h2>\n<h3>Expected Lifespan<\/h3>\n<p>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.<\/p>\n<h3>Signs It Needs Replacement<\/h3>\n<ul>\n<li>Mousse feels noticeably softer or spongy compared to new<\/li>\n<li>Visible tears, chunks missing, or deformation<\/li>\n<li>Vague steering feel \u2014 reduced front-end confidence in corners<\/li>\n<li>Excessive heat during use (mousse should be warm, not hot)<\/li>\n<\/ul>\n<h3>Storage Tips<\/h3>\n<ul>\n<li>Store in a cool, dry place away from direct sunlight<\/li>\n<li>Do not store compressed or folded<\/li>\n<li>Keep away from ozone sources (electric motors, welding equipment)<\/li>\n<li>Shelf life in sealed packaging: 3-5 years<\/li>\n<\/ul>\n<hr \/>\n<h2>Installation Guide (Front Wheel)<\/h2>\n<ol>\n<li>Remove existing front tire and tube from rim completely<\/li>\n<li>Clean 21-inch front rim bead seat area thoroughly<\/li>\n<li>Apply mousse lubricant generously inside the front tire casing<\/li>\n<li>Apply lubricant to the 90\/90-21 mousse insert itself<\/li>\n<li>Insert mousse into tire, working evenly around the casing<\/li>\n<li>Mount one bead onto the rim using tire irons<\/li>\n<li>Seat second bead carefully to avoid pinching the mousse<\/li>\n<li>Install front wheel, ensuring axle and spacers are properly aligned<\/li>\n<\/ol>\n<p><strong>Important:<\/strong> Never use petroleum-based lubricants on mousse inserts \u2014 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.<\/p>\n<hr \/>\n<h2>B2B Wholesale \u2014 Why Partner with Motobike Mas?<\/h2>\n<p>Motobike Mas is a Tianjin, China-based manufacturer of mousse inserts for off-road motorcycle racing tires. We supply dealers, distributors, race teams, and aftermarket brands worldwide with factory-direct pricing and full customization.<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>Factory Pricing<\/strong><\/td>\n<td>Direct wholesale \u2014 no middlemen<\/td>\n<\/tr>\n<tr>\n<td><strong>OEM \/ Private Label<\/strong><\/td>\n<td>Custom branding, packaging, and colors<\/td>\n<\/tr>\n<tr>\n<td><strong>Custom Formulations<\/strong><\/td>\n<td>Adjust density and material properties including front-specific formulations<\/td>\n<\/tr>\n<tr>\n<td><strong>MOQ<\/strong><\/td>\n<td>Contact for minimums<\/td>\n<\/tr>\n<tr>\n<td><strong>Shipping<\/strong><\/td>\n<td>Sea (FOB Tianjin), air freight, DDP available<\/td>\n<\/tr>\n<tr>\n<td><strong>Samples<\/strong><\/td>\n<td>Pre-production samples for evaluation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>Related Products<\/h2>\n<ul>\n<li><a href=\"https:\/\/motobikemas.com\/ja\/product\/100-90-19-high-performance-motorcycle-mousse-for-motocross-tires\/\">100\/90-19 High Performance Motorcycle Mousse<\/a> \u2014 Rear wheel mousse for MX and enduro<\/li>\n<li><a href=\"https:\/\/motobikemas.com\/ja\/product\/110-90-19-motocross-mousse-insert-mx-dirt-bike-racing\/\">110\/90-19 Motocross Mousse Insert<\/a> \u2014 Rear wheel mousse for full-size MX bikes<\/li>\n<li><a href=\"https:\/\/motobikemas.com\/ja\/product\/120-90-18-%e3%82%a8%e3%83%b3%e3%83%87%e3%83%a5%e3%83%bc%e3%83%ad%e3%83%a2%e3%83%bc%e3%82%bf%e3%83%bc%e3%82%b5%e3%82%a4%e3%82%af%e3%83%ab%e7%94%a8%e3%83%a0%e3%83%bc%e3%82%b9%e3%82%a4%e3%83%b3%e3%82%b5\/\">120\/90-18 \u30a8\u30f3\u30c7\u30e5\u30fc\u30ed \u30e2\u30fc\u30bf\u30fc\u30b5\u30a4\u30af\u30eb\u7528\u30e0\u30fc\u30b9\u30a4\u30f3\u30b5\u30fc\u30c8<\/a> \u2014 For enduro and rally rear wheels (18-inch)<\/li>\n<li><a href=\"https:\/\/motobikemas.com\/ja\/product\/70-100-19-front-wheel-motorcycle-mousse-for-motocross-dirt-bikes\/\">70\/100-19 Front Wheel Motorcycle Mousse<\/a> \u2014 Front mousse for youth MX and pit bikes<\/li>\n<li><a href=\"https:\/\/motobikemas.com\/ja\/product\/140-80-18-heavy-duty-motorcycle-mousse-for-enduro-adventure-bikes\/\">140\/80-18 Heavy Duty Motorcycle Mousse<\/a> \u2014 For adventure and heavy-duty enduro applications<\/li>\n<\/ul>\n<hr \/>\n<h2>Frequently Asked Questions<\/h2>\n<h3>Is 90\/90-21 a front or rear tire size?<\/h3>\n<p>90\/90-21 is a front wheel tire size \u2014 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.<\/p>\n<h3>What is the difference between 90\/90-21 and 80\/100-21?<\/h3>\n<p>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.<\/p>\n<h3>How long does a 90\/90-21 front mousse last?<\/h3>\n<p>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.<\/p>\n<h3>Will a 90\/90-21 mousse fit my bike?<\/h3>\n<p>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.<\/p>\n<h3>Can I run a mousse on the front wheel only?<\/h3>\n<p>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.<\/p>\n<h3>Does Motobike Mas offer samples before bulk orders?<\/h3>\n<p>Yes. B2B clients can request samples for evaluation before committing to volume orders. Contact our sales team to arrange sample shipments.<\/p>\n<h3>What is the lead time for OEM orders?<\/h3>\n<p>Typical lead time is 15-30 days for standard OEM production, depending on quantity and customization requirements.<\/p>","protected":false},"excerpt":{"rendered":"<p>The Motobike Mas 90\/90-21 off-road motorcycle mousse insert is a nitrile rubber foam tire insert for enduro &amp; MX front wheels. Standard fitment for full-size dirt bikes. Eliminates front pinch flats, reduces rotating mass. B2B wholesale from Tianjin, China.<\/p>","protected":false},"featured_media":607,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[18],"product_tag":[112,109,123,114,110,72,116,125,119,122,121,117,111,118,124,126,113,127,115,120],"class_list":["post-640","product","type-product","status-publish","has-post-thumbnail","product_cat-motorcycle-mousse","product_tag-21-inch-mousse","product_tag-90-90-21","product_tag-beta-enduro","product_tag-cross-country","product_tag-enduro-front-tire","product_tag-enduro-racing","product_tag-front-end-grip","product_tag-front-tire-safety","product_tag-honda-crf450x","product_tag-husqvarna-fe","product_tag-ktm-exc","product_tag-log-impact-protection","product_tag-off-road-front-mousse","product_tag-rock-deflection","product_tag-sherco-enduro","product_tag-single-track","product_tag-steering-stability","product_tag-technical-terrain","product_tag-trail-riding","product_tag-yamaha-wr450f","first","instock","shipping-taxable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.1 (Yoast SEO v25.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>90\/90-21 Off-Road Motorcycle Mousse Insert for Enduro &amp; MX Front Tires | Motobike Mas<\/title>\n<meta name=\"description\" content=\"B2B wholesale 90\/90-21 off-road motorcycle mousse insert for enduro &amp; MX front tires. 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Nitrile rubber foam replaces front inner tube. Eliminates pinch flats. 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