Sorry, a day later than I hoped, but the details on how to change the tension in a Shimano rear mech are on this Park Tool page;
https://www.parktool.com/blog/repair-help/rear-derailleur-overhaul
Any ideas why you’d ever want it in the lower tension setting? Trying to figure it out...
That’s the factory setting. No idea why.
@ak started
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Sorry, a day later than I hoped, but the details on how to change the tension in a Shimano rear mech are on this Park Tool page;
https://www.parktool.com/blog/repair-help/rear-derailleur-overhaul