11-34T vs 11-30T on long, steep climbs
I frequently climb long, steep hills and am trying to decide whether it's worth buying an 11-34T cassette for a bike that has an 11-30T cassette and a 34T small chainring. When riding up continuous grades of 10% to 20% for 40 to 120 minutes at a time, how noticeable would the difference be between running on 30T and 34T cassette cogs? Is each pedal stroke likely to feel significantly easier on 34T or does this feel like a subtle change?