{"product_id":"ar-pro-2-pack-4-10-4-50-18-heavy-duty-dirt-bike-inner","title":"AR-PRO (2-Pack) 4.10\/4.50-18\" Heavy duty Dirt Bike Inner","description":"\u003cp\u003e\u003cstrong\u003eThese AR-PRO 4.10\/4.50-18 inner tubes (2-pack) are heavy-duty butyl replacements with TR4 straight valves designed to fit a wide range of 18\" dirt bike rear tires.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eSwapping a worn or punctured inner tube is one of the quickest ways to get a dirt bike back on the trail. The AR-PRO 4.10\/4.50-18 tubes come as a pair and are built from thick butyl rubber to resist punctures and absorb trail shocks. They match common 18\" tire sizing—4.10 and 4.50 widths and related numerical designations—making them suitable for many motocross, enduro, and trail motorcycles.\u003c\/p\u003e\n\n\u003ch3\u003eWhat sizes and valve type does this tube fit?\u003c\/h3\u003e\n\u003cp\u003eThe tubes are sized for 4.10\/4.50-18 tires and also correspond to common numeric listings like 110\/100-18, 110\/90-18, 110\/80-18, 100\/100-18, 120\/90-18, and 120\/80-18. Each tube uses a TR4 straight valve stem compatible with standard valve caps and pumps.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for 18-inch rims and 4.10–4.50 tire widths\u003c\/li\u003e\n  \u003cli\u003eWorks with 110\/100-18 through 120\/90-18 size notations\u003c\/li\u003e\n  \u003cli\u003eIncludes TR4 straight valve stem for easy inflation\u003c\/li\u003e\n  \u003cli\u003eValve fits common pumps and air gauges\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and puncture-resistant are these inner tubes?\u003c\/h3\u003e\n\u003cp\u003eAR-PRO tubes are made from thicker butyl rubber than standard consumer tubes, improving resistance to typical trail punctures and pinch flats. They’re not invulnerable, but the heavier material offers better shock absorption and longer service life under rough riding conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThick butyl construction for enhanced durability\u003c\/li\u003e\n  \u003cli\u003eImproved shock absorption to reduce vibration\u003c\/li\u003e\n  \u003cli\u003eIncreased puncture resistance compared with thin tubes\u003c\/li\u003e\n  \u003cli\u003eSelf-sealing properties reduce immediate air loss from small punctures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich bikes and riding styles are compatible with these tubes?\u003c\/h3\u003e\n\u003cp\u003eThe 4.10\/4.50-18 tubes fit many compact to middleweight dirt bikes used for trail riding, motocross, and enduro. They are appropriate for rear tires on models from major manufacturers as well as popular Chinese and pit-bike brands when the tire size matches.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits Yamaha TTR230\/TTR250 and similar models\u003c\/li\u003e\n  \u003cli\u003eCompatible with Honda CRF230\/CRF250 and comparable bikes\u003c\/li\u003e\n  \u003cli\u003eWorks on Suzuki DRZ250\/DR200\/RM250 and Kawasaki KDX\/KLX variants\u003c\/li\u003e\n  \u003cli\u003eAlso suits TaoTao, Coolster and many pit-bike allocations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know when installing or handling these inner tubes?\u003c\/h3\u003e\n\u003cp\u003eHandle the tubes carefully to avoid pinches and tears during installation. Inflate slightly before seating to remove twists, ensure the tire bead sits evenly, and avoid using sharp tools that could damage the rubber or valve stem.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePartially inflate before inserting to prevent twisting\u003c\/li\u003e\n  \u003cli\u003eCheck bead seating on both sides of the rim evenly\u003c\/li\u003e\n  \u003cli\u003eDo not use sharp tools near the tube during installation\u003c\/li\u003e\n  \u003cli\u003eReplace worn valve cores or use new caps for secure sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Riders who need a reliable, budget-friendly spare or replacement set of rear inner tubes for 18\" dirt bike wheels. These AR-PRO tubes are suitable for weekend trail riders, pit bike owners, hobby MX riders, and anyone who wants a thicker butyl option for improved durability and ride comfort. They offer a practical balance of compatibility, toughness, and straightforward installation for common 18\" rear tire applications.\u003c\/p\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: Will these tubes fit my 110\/90-18 rear tire?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the AR-PRO 4.10\/4.50-18 tubes are compatible with 110\/90-18 rear tires when mounted on 18\" rims.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the TR4 valves compatible with standard pumps?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the TR4 straight valve stems work with most common hand pumps and air compressors with a standard valve head.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AR-PRO","offers":[{"title":"Default Title","offer_id":48087276322974,"sku":"B0DGGHLH9H","price":34.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ar-pro-front-packaging-2-pack_be55b419-8f96-4768-ba72-67c8164b4e49.jpg?v=1785920075","url":"https:\/\/northtrailauto.ca\/products\/ar-pro-2-pack-4-10-4-50-18-heavy-duty-dirt-bike-inner","provider":"North Trail Auto","version":"1.0","type":"link"}