Is a 11-28T cassette "outdated" in today's standard?
I got this older gen bike as my first road bike. As a relatively new cyclist (started 10 months ago), I didn't pay much attention to the components of my bike until I joined a casual cycling club and started noticing that my bike is a bit different. My bike has rim breaks, has 25C tires, and an 11-28T cassette. This is how I knew that my bike is from an older generation of bikes.
During our group rides, I can keep up most of the time especially on flats but I'm getting dropped on rolling hills with steep (15-20%) climbs. I am painstakingly grinding with my lightest gear ratio (34:28) when ascending these hills.
I wonder whether if my older just bike can't keep up with modern bikes or if my legs are just not strong enough.
Edit: Thanks for the responses. I think I will get a bigger cassette when I get a new bike in a few years. For now, I think my legs are just not strong enough and I need to upgrade it through training.