Schwalbe's Big Apple Plus Performance Line tire delivers comfortable cycling without using complicated technology. It also sports Plus 3mm GreenGuard puncture protection for extra safety! Air cushion tires are used as natural suspension. Inflated to around 30 psi, a Balloonbike rolls really easily and with a full suspension effect. A normal tire with a width of 37mm must be inflated to a rock-hard 55 psi, in order to roll similarly well.