Do you have hydraulic brakes? Drop bar brifters (combined shifters + brake levers) only exist for 10 or more speed drivetrain. In principle there are no 9 or 8 speed hydraulic brifters. If you are going this route, brifters will cost more than the brake calipers anyway.

You may be able to use something like TRP Hylex levers with your brakes + bar end shifters.

If you use levers for cable actuated brakes you will need to get new calipers.

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