What cassette are you fitting? The Pro4 is 11-speed road compatible, so if you are fitting an 11-speed road cassette (except the Shimano 11-34t ones), you won’t need it.
If you are fitting basically anything else, you will need it.
Edit: Missed the picture description. You will need it.
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What cassette are you fitting? The Pro4 is 11-speed road compatible, so if you are fitting an 11-speed road cassette (except the Shimano 11-34t ones), you won’t need it.
If you are fitting basically anything else, you will need it.
Edit: Missed the picture description. You will need it.