regarding mtb tubes from japan or us or some reynolds . Tubes are not the same for roadbile and mtb , even if they are double or triple , mtb tube are reinforced vitus or reynolds with the same name for road or mtb if you check the tubing size , mtb tube have usually 0.2 to 0.3 thicker than road tubes. regarding brand , marin ,trek , commencal (not sunn very fragile) scott or giant those brands are bullet proof for mid range frame . Again just avoid alloy frame even if they are from those brands