Bike rental in Kiel?

[soccermom4]

Thinking about renting bikes while in Kiel (if the weather is nice). However, it looks like SprottenFlotte (the bike sharing company) no longer operates there (as of 1/1/23).  Any recommendations as an alternative?  Is this a good option for a day in Kiel (6/27/23 from 7 am - 4 pm) or should we try a train to Lübeck?  A little concerned about feeling rushed if it takes 1 hr 30 min to get from the port to train to Lubeck.  Also - the port schedule shows our times as 10 pm - 7 pm, but Carnival shows 7 am - 4 pm...