Hi moofy,
we are not experts, just people living with the issues and implications. In the end it will be your decision but my thoughts are that the more information you have, the better equipped you are to deal with the problem. If the biopsy shows that you have a gentle pussy cat at Gleason 3+3, with good margins and low volume then active surveillance may keep you well and confident for the rest of your life, with no horrible shocks. If it shows a G5+5 or spread to other areas then you can make decisions about which treatments will best contain it with the least impact on your current lifestyle.
My father-in-law was diasgnosed at 79. He did have the biopsy which showed low volume, low aggressive cancer but with some lymph node involvement. He had the lymph nodes removed and some chemo but declined any of the usual treatments because he felt at his age his sex life and ability to play golf etc was more important than living for many years. As it happened, he only lived 4 years but definitely did things on his terms.
Just a note of information; cycling does raise the PSA - professional cyclists have higher rates than other men - but there is no suggestion that cycling increases the risk of prostate cancer. However, 33 might be a bit high for blaming a bike!
I hope that helps in some way?