I see these on the product model number of derailleurs but cant seem to know what's the difference? Like there would be 2 models for an alivio top swing fd and one would have the ts3 and the other would have the ts6 indication? I have seen this also on other variants like altus, acera, etc.

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I believe TS means Top Swing and the digit refers the chain stay angle range (3 for 63-66 degrees or 6 for 66-69 degrees). For example, see the data for the FD-T4000-TS6 here: https://bike.shimano.com/en-EU/product/component/alivio-t4000/FD-T4000-TS6.html and for the FD-T4000-TS3 here: https://bike.shimano.com/en-EU/product/component/alivio-t4000/FD-T4000-TS3.html

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