{"product_id":"ar-pro-2-pack-110-90-19-4-50-x-19","title":"AR-PRO (2-Pack) 110\/90-19 (4.50 x 19\")","description":"\u003cstrong\u003eThese AR-PRO inner tubes are a 2-pack of natural rubber motorcycle tubes (fits 110\/90-19 and 120\/90-19 tires) with TR4 valve stems, built for off-road and motocross use.\u003c\/strong\u003e\n\n\u003cp\u003eWhen you need durable replacement inner tubes for dirt bikes or off-road motorcycles, these AR-PRO tubes offer a balance of flexibility, puncture resistance, and easy valve compatibility. Made from standard 1.6mm natural rubber and fitted with TR4 valve stems, the pair is sized to work with 4.50–4.72\" wide tires on 19\" rims. They’re designed to resist pinching, twisting, and abrasion common on rough trails while remaining compatible with most pumps and repair kits.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these tubes match my tire size and rim?\u003c\/h3\u003e\n\u003cp\u003eThe AR-PRO set fits tires labeled 110\/90-19 (4.50 x 19\") up to 120\/90-19 (4.72 x 19\"). That range covers many off-road and enduro tire widths. For proper fit, match the tire width and confirm a 19\" rim diameter.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits tire widths from 110 mm (4.50\") to 120 mm (4.72\")\u003c\/li\u003e\n  \u003cli\u003eRim diameter: 19 inches\u003c\/li\u003e\n  \u003cli\u003eEach pack contains two identical inner tubes\u003c\/li\u003e\n  \u003cli\u003eDesigned for common off-road tire profiles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes natural rubber better for off-road inner tubes?\u003c\/h3\u003e\n\u003cp\u003eNatural rubber at the standard 1.6mm thickness stays supple across temperature changes and conforms to tire movement during rough riding. Its elasticity reduces permanent deformation and provides improved abrasion resistance compared with some synthetic blends. That flexibility helps the tube absorb impacts instead of pinching or tearing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStandard 1.6mm wall thickness for balance of strength and pliability\u003c\/li\u003e\n  \u003cli\u003eHigh abrasion resistance for rocky and sandy conditions\u003c\/li\u003e\n  \u003cli\u003eResists permanent distortion after repeated impacts\u003c\/li\u003e\n  \u003cli\u003eMaintains flexibility in varying trail temperatures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre the valve stems and puncture protection reliable?\u003c\/h3\u003e\n\u003cp\u003eEach tube uses a TR4 valve stem — a short, straight, threaded stem vulcanized into the tube for a secure seal. The tubes are molded evenly to reduce pinch points and improve resistance to splitting at the valve base. While no tube is immune to every puncture, these are built to limit common pinch flats and valve failures.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTR4 threaded valve stems compatible with most hand and floor pumps\u003c\/li\u003e\n  \u003cli\u003eValve base vulcanized for a leak-resistant seat\u003c\/li\u003e\n  \u003cli\u003eEven molding reduces pinch and twist-related failures\u003c\/li\u003e\n  \u003cli\u003eGood puncture resistance for trail and motocross conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these tubes perform on rough trails and motocross tracks?\u003c\/h3\u003e\n\u003cp\u003eAR-PRO inner tubes are intended for off-road use, designed to withstand repeated impacts and abrasive surfaces encountered in motocross and trail riding. The combination of natural rubber and robust molding helps the tubes resist cutting, pinching, and premature splitting under typical off-road stresses. They make a practical, cost-effective replacement for worn or damaged tubes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngineered for dirt bike and motocross conditions\u003c\/li\u003e\n  \u003cli\u003eDurable construction suited to uneven terrain and obstacles\u003c\/li\u003e\n  \u003cli\u003eCost-effective alternative to OEM or specialty tubes\u003c\/li\u003e\n  \u003cli\u003eSupplied as a convenient two-tube pack for spares or paired replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: Riders who run 19\" rims with 110–120 mm tire widths and want a dependable, flexible inner tube for off-road, enduro, or motocross use. These tubes suit weekend trail riders, racers needing quick replacements, and anyone wanting a reliable TR4-valve compatible tube that balances puncture resistance with ride comfort.\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 120\/90-19 tire?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the AR-PRO tubes cover 110\/90-19 through 120\/90-19 sizes and fit 19-inch rims.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use a standard floor pump with these valves?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — they use TR4 threaded valve stems compatible with most hand and floor pumps.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AR-PRO","offers":[{"title":"Default Title","offer_id":48087051501726,"sku":"B09TT4DCMB","price":33.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ar-pro-front-packaging-2-pack_6467fb27-1f6a-405e-84e2-4122875fe8fb.jpg?v=1785915415","url":"https:\/\/northtrailauto.ca\/products\/ar-pro-2-pack-110-90-19-4-50-x-19","provider":"North Trail Auto","version":"1.0","type":"link"}