Most similar questions are asking about using the same chain with a bigger cluster with more gears (10 speed chain vs 11 speed cluster).
My concern is being able to simply buy a higher gear ratio cassette and still keep the same chain?
I have Shimano Ultegra 10 speed system, but my cassette is an 11-24 cluster. I want to replace it with another 10 speed cassette but 12 to 32, with grannies for massive hill climbs.
Surely I don't need to replace the chain if the number of gears on the cassette is the same - ie: 10 speed?