46/34 and either 11-28 or 11-32 11 speed SRAM cassette. Would prefer 48/36 but those don't exist (Rotor Q Rings). Usually don't need more than the 25 cog and always bring one extra just in case. If I think the 25 cog is enough, I have the 28 on the rear. If I think I need the 28, I bring the 32.
At 320 watts on a 14% climb that we can have in the East, I am doing about 5 MPH. At 200W, it is more like 3.2 mph. What is that about 50 rpm and 32 rpm grinding the 34x32 gearing. That is why I prefer to keep long climbs to no more than 10%.
I just looked at Strava and the last 10% grade that was a mile or longer I did was at 6.3mph average speed and my average cadence was 64 (34x25 gearing). I don't have a power meter so I can't comment on that.
I felt like I was ruining my knees even at that cadence haha... couldn't imagine 30-50rpm