The JBP insurance is for your rental bike. The cost is 79 SEK /day and will cover damages on your bike, should you fall and something breaks.
If you do not have the insurance, you will have to pay both for the parts that breaks as well as the cost to repair it. If you have the insurance, it will cover it all.
We highly recommend the insurance since the bikes components are expensive and easily breaks.
OBS! The insurance does not cover theft. OBS!