An 11-32 would be a cheaper and easier solution providing a lower gearing than a 34\28 combo
Would need a new (long cage) RD?
For some reason, it work fine with the SS derailleur, as long you screw in the derailleur limiter.
@branwen started
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An 11-32 would be a cheaper and easier solution providing a lower gearing than a 34\28 combo