{"product_id":"tusk-severe-duty-3mm-inner-tube-80-100x21-reinforced-butyl-tr-4-valve-tough-trail-replacement","title":"Tusk Severe Duty 3mm Inner Tube 80\/100x21 – Reinforced Butyl, TR-4 Valve, Tough Trail Replacement","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eWhen you need reliability on challenging terrain, the Tusk Severe Duty 3mm inner tube stands up to the task. Built for front tires sized 80\/100x21, it combines a thick, reinforced wall with durable butyl rubber to deliver steady air retention and confident performance as you push through rocky trails and dusty gravel lanes. The centered TR-4 valve stem simplifies inflation and pressure checks, so you can ride with fewer interruptions. Use it as a sturdy spare or a trusted replacement for rough-terrain rides where reliability matters.\u003c\/p\u003e\n\u003ch2\u003eWhy it stands out\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e3 mm reinforced wall adds puncture and impact resistance for rugged riding conditions\u003c\/li\u003e\n  \u003cli\u003eHigh-quality butyl construction delivers stable air retention and long-term durability\u003c\/li\u003e\n  \u003cli\u003eCentered TR-4 valve stem ensures a consistent fit on most rims and straightforward inflation\u003c\/li\u003e\n  \u003cli\u003ePrecise 80\/100x21 sizing tailored for front tires on many dual-sport and trail bikes\u003c\/li\u003e\n  \u003cli\u003eRugged spare or replacement designed to be ready when off-road conditions get tough\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eReal-world use and practical tips\u003c\/h2\u003e\n\u003cp\u003eOn the trail, you’ll notice the tube’s balance between pliability and protection. The thicker wall resists pinch flats when you roll over sharp edges, while the butyl compound maintains air pressure across long stretches between top-ups. The 80\/100x21 sizing helps ensure a snug fit with compatible rims, supporting predictable handling and quick tire maintenance mid-ride.\u003c\/p\u003e\n\u003cp\u003eConsider these practical scenarios:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePlentiful backcountry rides where puncture resistance helps reduce downtime\u003c\/li\u003e\n  \u003cli\u003eRides across rocky singletrack and rough gravel where a dependable spare is welcome\u003c\/li\u003e\n  \u003cli\u003eFront-wheel replacements during a multi-day off-road trip for peace of mind\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMounting and care reminders\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eInspect rim edges for sharp burrs or damage before mounting to protect the tube\u003c\/li\u003e\n  \u003cli\u003eVerify tire and rim compatibility and ensure proper bead seating\u003c\/li\u003e\n  \u003cli\u003eInflate to the recommended pressure and check the valve seating regularly\u003c\/li\u003e\n  \u003cli\u003eKeep this tube as a ready spare for long off-road days or weekend trips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAt a glance\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e3 mm Reinforced Wall\u003c\/li\u003e\n  \u003cli\u003eButyl rubber construction\u003c\/li\u003e\n  \u003cli\u003eCentered TR-4 valve stem\u003c\/li\u003e\n  \u003cli\u003e80\/100x21 exact sizing\u003c\/li\u003e\n  \u003cli\u003eRugged spare or replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What tire size and rim does the Tusk 3mm inner tube fit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Fits 80\/100x21 front tires; verify rim compatibility before mounting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this tube suitable for rugged off-road use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, its 3mm reinforced wall and durable butyl support reliability on tough trails; ideal as a spare.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TUSK","offers":[{"title":"Default Title","offer_id":42469610782805,"sku":"B09YK9RVPF","price":52.67,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/tusk-severe-duty-3mm-inner-tube-80-100x21-reinforced-wall.jpg?v=1778098762","url":"https:\/\/plentytorque.co.uk\/products\/tusk-severe-duty-3mm-inner-tube-80-100x21-reinforced-butyl-tr-4-valve-tough-trail-replacement","provider":"PlentyTorque","version":"1.0","type":"link"}