I don't know the answer to your question though, I'll let you know if it works... I don't mind only using 5 or 6 out of 7 sprokets if derailleur limits me...
Just did a quick test - 11-28 work fine, as long there's less than 10t jump on the front chainring.
Just did a quick test - 11-28 work fine, as long there's less than 10t jump on the front chainring.