There are no safety rails (arch) provided by the structure.✓Respuesta correcta
The minimum residual height of the tire tread is 1.6 mm.
In both cases.
Explicación
A motorcycle must retain the protective bars or guards included in its approved design because they provide intended protection. A tread depth of 1.6 mm is above the motorcycle minimum cited by these rules, so it does not combine with the missing guard as a prohibition.