Not sure if I can jump in here ... My son rides for Monnas school MTB. It is technical with up hills and flats. Averages around 4.5km a lap and they do that in about 18min. The champs does it in 13min a lap. They are 16years old and ride with 26" bikes. What tyres would you recommend as I know nothing about MTB tyres ... ? I know wider in front for lower pressure and more grip and that is it. Thanks
