So today I installed a new (rear) tube on the Giant, and it went about as flawless as one could hope for. It was my first flat repair on this bike.
After I reinstalled the wheel and topped off the tire pressures I took a ride around the block and the shifter (cassette) is requiring a double tap to shift.
The derailleur was not out of adjustment when I parked it with the flat, and I moved the chain all the way down to the smallest cog before removing the wheel.
So what might I have done wrong to cause the shifting issue?
Thanks in advance,