The schwalbe nobby nic folding tyre is a fantastic addition to your mountain bike with amazing tread and traction for speed as well as top notch performance you are sure to fly around on the trails with easy and easy predictable handling the phase shifter blocks on the tyre use a variation in the interblock space which gives a profile cluster than enhances grip the u blocks used on the tyre help enhance grip also the centre blocks are non directional so the u blocks can act optima