Yes the bikes can be ridden in the rain but cannot be fully submerged in water.

Hi, yes we keep spares for all our bike models.

Yes the 17" frame is suitable for heights between 5'5" and 6".

This is a difficult question to answer exactly as it depends on the weight of the person, the gear your in, the terrain your riding on and wind resistance but generally our mountain bikes will last for 40-60km.