Air suspension built-in. The Big Apple started off the Balloonbike trend ten years ago: Comfortable cycling without using complicated technology! Air cushion tires are used as natural suspension. Inflated to around 2 Bar a Balloonbike rolls really easily and with a full suspension effect. A normal tire with a width of 37 mm must be inflated to a rock-hard 4 bar, in order to roll similarly well.BIG APPLE PLUS. Now enjoy Balloonbike comfort with extra safe 3 mm GreenGuard puncture protection. Features:- Compound: Endurance- The new Marathon compound for the highest durability. - Execution: RaceGuard® -This belt was developed specially with racing in mind. A synthesis of special india rubber and several layers of nylon fabric offers very effective protection against penetration punctures. There is only a minimal increase in weight and rolling resistance of these tires. , Performance Line- Excellent quality for intensive use. - Carcass: Black with reflective lines - Skin: Lite Skin - Skin describes the sidewall - Lite: Light and thin. Consists only of the rubberized casing. - Twin: An additional rubber coating on the side protects against cuts and allows for uniform colouring. - Snake: Very light and effective protection using SnakeSkin fabric. Specifications:- Weight: 710 g (25 oz) - Pressure: 30-55 psi (2,0-4,0 Bar) - Maximum load: 130 - Tread: HS 430 - Inch size = 26x2.15