Vittoria Air-Liner Light Gravel Tyre Insert - 700 x 37-40c

The Air-Liner Light Gravel is a tubeless insert for 37 40 mm gravel tyres that boosts comfort, stability, and rim protection. Its semi-permeable run-flat foam retains and releases air to keep you moving after a puncture. Progressive compression smooths harsh hits without a dulling feel and cornering support reduces burps at low pressures for consistent control.Key Features and Benefits:Semi-permeable run-flat foam: The foam holds air and releases it gradually after a puncture while overexpanding to support the tyre. You keep steering and braking control and can ride on to a safe stop, reducing rim damage and downtime.Progressive compression limitless travel : The insert compresses in stages to absorb both small chatter and big impacts. You get smoother damping and steadier grip, which reduces fatigue and helps the bike track clean lines on rough surfaces.Anti-snake-bite protection: The foam cushions impacts against rim walls during hard hits. This cuts pinch-flat risk and sealant loss, so punctures from rim strikes are far less likely and wheels stay protected.Lateral stability support: The insert braces the sidewalls, especially in corners and off-camber sections. That limits tyre burping at low pressures, so pressures can be tuned for grip without sacrificing security.Gravel-specific sizing (37 40 mm): Volume and density are tuned for common gravel widths and tubeless beads. Fit is clean, pressure range is predictable, and setup suits modern gravel rims.Sealant-safe, cut-resistant construction: The material resists cuts and works with sealant rather than blocking it. Sealant can still flow and plug holes, which extends insert life and reduces maintenance.Riders want dependable speed and control on long, rough routes without roadside delays. The run-flat foam maintains support after air loss, while progressive compression and sidewall bracing allow lower pressures with fewer burps. This combination protects rims, reduces pinch-flats, and keeps handling consistent across changing surfaces.Choose the size for your 37 40 mm tubeless gravel tyres and fit a pair for balanced front and rear support. Add reliable protection, steadier grip, and a built-in plan for punctures on every ride.