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. 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 Specifications:- Carcass: Black with reflective lines- Skin: Lite Skin- Skin describes the sidewall- Lite: Light and thin. Consists only of the rubberized casing. - Weight: 780 g (28 oz)- Pressure: 30-55 psi (2,0-4,0 Bar)- Maximum load: 140