Drive to work in heavy rain. An opportunity to drop in the bike shop on the way home. Their stock wasn’t complete so I came away with a 12-21 teeth cassette instead of my preferred 13-23. Oh well, it works smoothly even though it’s the lowest few gears that will be used the most. I can change to a more suitable gear range in time for the autumn when the pace fall back a little and the hills feel steeper.