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Can't seem to figure out the way to enter the cable shifter which broke while riding!!!

Can't also find a manual or video out there helping me to replace it.

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  • Did the inner cable break inside your shifter ? IE, is there a little piece of wire lost inside the shifter's body ? This can be easy or very hard to resolve.
    – Criggie
    Dec 9, 2020 at 21:30

2 Answers 2

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manual is here

https://si.shimano.com/api/publish/storage/pdf/en/dm/ST0001/DM-ST0001-05-ENG.pdf

exploded diagram here

https://si.shimano.com/api/publish/storage/pdf/en/ev/ST-4603/EV-ST-4603-3155.pdf

all via si.shimano.com

Video for similar shifter

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For the RD, shift to the smallest sprocket i.e. activate the inner lever for as long as it clicks. Pull the brake lever, hint: open the caliper in the way you would to remove the wheel. That way you can push the gear cable out of the brifter.

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