23°C, light breeze, full sun.
Chain guages are invaluable. If you replace a chain before too long, then you don’t have to replace the cassette. My Zing passed the test, which is strange – it’s done 1,400.
The Racelite bike I was on failed the 0.75 and the 1.0 measure. That means a new chain is urgent.
Later: fitted a chain, but it skips over the cogs. Now need a new cassette. Nobody seems to have any in stock.