Swapping Cassettes? (SRAM and Shimano)

flopstocks
flopstocks Posts: 110
edited September 2015 in Road beginners
Hello I recently purchased a Planet X Pro carbon with full 22 speed SRAM rival, which has the WiFli 11-32 rear cassette.

I am finding the gearing pretty easy (as I rarely use the small cog up front), and was thinking about changing to 11-28 or maybe even smaller. The 11 speed Shimano cassettes seem to be cheaper, would these be compatible with my bike?

Thanks

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