Yes, we recommend that  you have a valid travel insurance in case something happens to you during the tour.
If you rent bikes from us, they are not insured. You have a good bike lock included when you rent bikes. If they get while you are stopped for example stolen you are responsible to pay the amount of money that the bikes are worth. Please confirm with your travel insurance if they cover the bikes.
If the bikes are stolen from a hotel, the hotel will be responsible for paying the value of the bikes. All the hotels have proper bike storage facilities where you can securely leave and charge the bikes.