Air suspension built-in.The Big Apple started off the Balloon Bike trend more than ten years ago: Comfortable cycling without using complicated technology!Air cushion tyres are used as natural suspension. Inflated to around 2 Bar a Balloon Bike rolls really easily, with a similar effect to full suspension. A normal tyre with a width of 37mm must be inflated to a rock hard 4 bar, in order to roll similarly well.* Dynamo Compatible: With dynamo ribbing for extra grip.* E-Bike: motor assist up to 25 km/h, loads and average speeds are higher, we only recommend certain tyres as E-Bike Ready 25.* RaceGuard(R): Double layer of Nylon fabric under the tread. Excellent puncture protection for a tyre that should be fast and lightweight.* Balloon bikes: Air suspension built-in.* Performance Line: Excellent quality for intensive use. These are the best value for money tyres.* Weight: 495g (20"), 675g (26")**ETRTO:*** SCC020: 50-406 * SCC0200: 55-406* SCC0205: 50-507* SCC021: 50-507* SCC022: 55-559* SCC0220: 60-559* SCC023: 50-622