"It uses a semi-closed cell foam that works by slowly absorbing the air pressure in fully inflated tires. Then, when you puncture, the rapid release of air from your tire causes them to swell up and fill the tire, keeping you riding on air...almost like normal."
"The Air-Liner Light inserts let you run slightly lower pressure for better traction and a smoother ride. This works because there's a foam insert to mitigate the hits and provide support in the corners."
"Combined, the sealant plus insert lets you ride up to 50km (~30 miles) after a puncture. The insert gradually releases its air, so you won't get that dangerous blowout, and even when it's 'flat', it's still equivalent to roughly 1 bar (14.5psi) of air pressure."
Vittoria's Air-Liner Light Road tire inserts feature semi-closed cell foam technology that absorbs air pressure from fully inflated tires. When a puncture occurs, the rapid air release causes the foam to expand and fill the tire, enabling continued riding without stopping. The upgraded version uses improved materials and extrusion processes for easier installation and reduced sealant absorption. The inserts allow lower tire pressure for better traction and smoother rides while providing corner support. Combined with sealant, riders can travel approximately 50km after puncturing. The insert maintains roughly 1 bar of pressure even when depleted, sufficient to reach home or finish lines. Each insert weighs 30-40g per tire and costs $77.99 per wheel.
Read at Bikerumor
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