I think I broke my shifter?
Struggling up a hill the other day I tried one time too many to shift in to a lower gear. (I was already in the 34-23 gear) I pushed a little too hard on the shifter and SNAP, something inside the shifter broke and I could only shift to a smaller cog not back up to easier gears. I was surprised how easily it broke. Fortunately the bike is new and the shop replaced the DA 7900 shifter free.
I'm wondering if the shifter was defective or was I just a clumsy oaf and use too much force? I would think there should be a clutch of some sort that would give way if the derailleur was at its limit. I'm afraid it may happen again.