This is the challenge pista 320 tubular track tyre strong and light at the same time has outstanding features on wood and cement tracks when speed is key and you have no time to think the challenge pista 320 track tubular is the tubular to rely on all tubular and open tubular produced by challenge are special hand made products machines are not able to produce them and the manual skill required in each step to obtain a good quality standard is very high the casing is produced with the late