{"product_id":"michelin-21-inch-heavy-duty-inner-tube-tr-4-center-metal-valve-part-40953","title":"Michelin 21-Inch Heavy-Duty Inner Tube, TR-4 Center Metal Valve, Part 40953","description":"Inner Tube - Heavy Duty - 21\" - TR-4 - Center Metal Valve\n\u003cp\u003eThe Michelin Airstop Heavy-Duty Inner Tube is designed for 21-inch tire applications requiring dependable performance and enhanced durability. This model uses a TR-4 center metal valve for secure inflation and compatibility with tires that specify this valve configuration. Manufacturer and vendor part number 40953 identifies this Michelin replacement tube.\u003c\/p\u003e\u003cp\u003eIts splice is positioned opposite the valve to help promote a more balanced tube during installation and operation. The overlap splice design provides greater strength than the butt splice commonly used in many standard inner tubes, making it a suitable choice for demanding riding and service conditions. Michelin Airstop tubes are selected by riders and technicians seeking high-quality replacement components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e Intended for 21-inch tires that require a TR-4 center metal valve inner tube. Confirm tire specifications, valve placement, and application requirements before installation. The Michelin brand, Airstop construction, heavy-duty design, and part number 40953 make this tube a reliable replacement for compatible motorcycle and powersports tire assemblies.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSize: 21-inch inner tube for compatible tire applications\u003c\/li\u003e\n\u003cli\u003eModel: Airstop Heavy-Duty with TR-4 center metal valve\u003c\/li\u003e\n\u003cli\u003eBrand: Michelin\u003c\/li\u003e\n\u003cli\u003eManufacturer part number: 40953\u003c\/li\u003e\n\u003cli\u003eVendor part number: 40953\u003c\/li\u003e\n\u003cli\u003eSplice design: Overlap splice for increased strength compared with a traditional butt splice\u003c\/li\u003e\n\u003cli\u003eValve placement: Splice positioned opposite the valve to help provide a more balanced tube\u003c\/li\u003e\n\u003cli\u003eFitment: For 21-inch tires requiring a TR-4 center metal valve inner tube\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MICHELIN","offers":[{"title":"Default Title","offer_id":67544828772587,"sku":"21CH","price":42.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/112266.png?v=1790647031","url":"https:\/\/ctracingservices.com\/products\/michelin-21-inch-heavy-duty-inner-tube-tr-4-center-metal-valve-part-40953","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}