{"product_id":"pirelli-mt-21-rallycross-rear-tire-120-90-17-64r-part-number-3988400","title":"Pirelli MT 21 Rallycross Rear Tire 120\/90-17 64R, Part Number 3988400","description":"Tire - MT 21™ Rallycross - Rear - 120\/90-17 - 64R\n\u003cp\u003eThe Pirelli MT 21 Rallycross rear tire is a dual-sport tire designed for riders who demand dependable off-road performance over extended distances. Its 120\/90-17 size, 64R load and speed rating, and rear-wheel fitment make it a suitable replacement for compatible adventure, enduro, and dual-sport motorcycles. The tire is engineered primarily for off-road riding while maintaining on-road capability for connecting trails and paved routes.\u003c\/p\u003e\u003cp\u003eManufactured by Pirelli and supplied under vendor part number 3988400, the MT 21 Rallycross is recognized as a popular dual-sport choice in the United States. Its tread design supports traction across dirt, gravel, rocky paths, and other challenging off-road surfaces. With a 90% off-road and 10% on-road application, it is best suited for riders who prioritize trail performance while retaining limited street versatility.\u003c\/p\u003e\u003cp\u003eConfirm motorcycle fitment, wheel position, load requirements, and manufacturer recommendations before installation. This Pirelli rear tire is intended for compatible motorcycles using a 17-inch rear wheel and the specified 120\/90-17 sizing. Professional mounting and balancing are recommended for safe, reliable operation.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSize: 120\/90-17\u003c\/li\u003e\n\u003cli\u003eModel: MT 21 Rallycross\u003c\/li\u003e\n\u003cli\u003ePosition: Rear\u003c\/li\u003e\n\u003cli\u003eBrand: Pirelli\u003c\/li\u003e\n\u003cli\u003eManufacturer: Pirelli\u003c\/li\u003e\n\u003cli\u003eVendor Part Number: 3988400\u003c\/li\u003e\n\u003cli\u003eLoad and Speed Rating: 64R\u003c\/li\u003e\n\u003cli\u003eApplication: Dual-sport tire with a 90% off-road and 10% on-road focus\u003c\/li\u003e\n\u003cli\u003ePerformance: Designed for dependable off-road traction over long distances\u003c\/li\u003e\n\u003cli\u003eFitment: Compatible with motorcycles specified for a 120\/90-17 rear tire\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PIRELLI","offers":[{"title":"Default Title","offer_id":67544881070315,"sku":"03170649","price":160.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/2496836.png?v=1790649413","url":"https:\/\/ctracingservices.com\/products\/pirelli-mt-21-rallycross-rear-tire-120-90-17-64r-part-number-3988400","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}