CushCore TRAIL provides an all-new option for riders looking for a performance/weight balance between our PRO and XC inserts.Additionally, CushCore TRAIL was engineered to provide more progressive sidewall support:the harder you push, the more support you´ll feel.Enabling supple tire response on flat corners and a stable sidewall when railing berms.Like all CushCore tire inserts, TRAIL absorbs shock and vibration, improves cornering, and prevents flats/rim damage … giving TOTAL CONFIDENCE for All Riders.Combination of a 27.5´´´´ CushCore and a 29´´´´ CushCore.Each kit includes 2 inserts and 2 air valves.SPECS.Tire widths:2.1-2.6.Inner rim width:22mm-35mm.WHAT IS CUSHCORE?.CushCore® (Patent Pending) is an engineered closed-cell foam insert that mounts inside a mountain bike tire.It divides the tire roughly in half, with CushCore next to the rim and a tunable air pocket under the tread.It radically changes the way your bike interacts with the ground.These characteristics provide:o Faster, Smoother Ride.o More Traction.o Superior Cornering.o Reliable Rim & Tire Protection.THE PROBLEM.At low pressure, tires are supple and responsive to bumps - but squirm and roll in corners.At high pressure, tires have good stability - but lose traction and give a rough ride.THE SOLUTION.CushCore ends the compromise.It´s the only tire insert engineered to give you a superior ride.PLUSH.12% smoother ride.Like taking less punches in a fight..BETTER SUSPENSION.16% less travel consumption.150mm feels like 175mm.SUPERIOR CORNERING.35% more stabilitiy.FASTER ROLLING.3% Less rolling resistance.PROTECTION.50% less impact force (big hits).Prevents rim damage and flat tires.