Ром, звукоизоляции - нуль.
SR1 - Only 88dB(A) at 100 km per hour (with closed machines)
C3 - < = 84 dB(A) at 100 km per hour (with closed machines)
C3 pro - Only 82dB(A) at 100 km per hour (with naked bikes)
S2 - Only 85dB(A) at 100 km per hour (with naked bikes)